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Physical Science
Ch 7 Electricity
bull Yes we all know what electricity is but
exactly what is it
-where does it come from
-can you see it
-how is it created
Electricity
bull Electricity is a force created by a difference in charges (+ amp -) due to gained or lost electrons (an electron is a negatively charged particle)
bull When there is a movement of electric charges this is actually electrons moving from point A to point B This is called an electrical current
bull In order for these electrons to flow
however there must be a difference in
charges ( of electrons built up) between
the 2 points Just like heat flow needs a
difference in temperatures
bull Electricity always flows from a location
with a negative charge to a location with a
positive charge (like charges repel opposites attract)
- +
bull Think of a battery the
top has a + charge and
the bottom has a
negative charge So
when they are
connected electrons
flow from the bottom to
the top
Static Electricity
bull You may have noticed that if you walk across the carpet in socks and then touch your catrsquos nose it will shock himher (it)
bull This is because you picked up some free electrons walking over the carpet (kind of like dust) and therefore gained a negative charge
bull Touching kittyrsquos nose allows you to dissipate that
charge (send the extra electrons to an area with
fewer electrons negative to positive)
bull The shock will continue until both surfaces are at
the same charge (neutralized)
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Yes we all know what electricity is but
exactly what is it
-where does it come from
-can you see it
-how is it created
Electricity
bull Electricity is a force created by a difference in charges (+ amp -) due to gained or lost electrons (an electron is a negatively charged particle)
bull When there is a movement of electric charges this is actually electrons moving from point A to point B This is called an electrical current
bull In order for these electrons to flow
however there must be a difference in
charges ( of electrons built up) between
the 2 points Just like heat flow needs a
difference in temperatures
bull Electricity always flows from a location
with a negative charge to a location with a
positive charge (like charges repel opposites attract)
- +
bull Think of a battery the
top has a + charge and
the bottom has a
negative charge So
when they are
connected electrons
flow from the bottom to
the top
Static Electricity
bull You may have noticed that if you walk across the carpet in socks and then touch your catrsquos nose it will shock himher (it)
bull This is because you picked up some free electrons walking over the carpet (kind of like dust) and therefore gained a negative charge
bull Touching kittyrsquos nose allows you to dissipate that
charge (send the extra electrons to an area with
fewer electrons negative to positive)
bull The shock will continue until both surfaces are at
the same charge (neutralized)
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Electricity
bull Electricity is a force created by a difference in charges (+ amp -) due to gained or lost electrons (an electron is a negatively charged particle)
bull When there is a movement of electric charges this is actually electrons moving from point A to point B This is called an electrical current
bull In order for these electrons to flow
however there must be a difference in
charges ( of electrons built up) between
the 2 points Just like heat flow needs a
difference in temperatures
bull Electricity always flows from a location
with a negative charge to a location with a
positive charge (like charges repel opposites attract)
- +
bull Think of a battery the
top has a + charge and
the bottom has a
negative charge So
when they are
connected electrons
flow from the bottom to
the top
Static Electricity
bull You may have noticed that if you walk across the carpet in socks and then touch your catrsquos nose it will shock himher (it)
bull This is because you picked up some free electrons walking over the carpet (kind of like dust) and therefore gained a negative charge
bull Touching kittyrsquos nose allows you to dissipate that
charge (send the extra electrons to an area with
fewer electrons negative to positive)
bull The shock will continue until both surfaces are at
the same charge (neutralized)
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull In order for these electrons to flow
however there must be a difference in
charges ( of electrons built up) between
the 2 points Just like heat flow needs a
difference in temperatures
bull Electricity always flows from a location
with a negative charge to a location with a
positive charge (like charges repel opposites attract)
- +
bull Think of a battery the
top has a + charge and
the bottom has a
negative charge So
when they are
connected electrons
flow from the bottom to
the top
Static Electricity
bull You may have noticed that if you walk across the carpet in socks and then touch your catrsquos nose it will shock himher (it)
bull This is because you picked up some free electrons walking over the carpet (kind of like dust) and therefore gained a negative charge
bull Touching kittyrsquos nose allows you to dissipate that
charge (send the extra electrons to an area with
fewer electrons negative to positive)
bull The shock will continue until both surfaces are at
the same charge (neutralized)
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Think of a battery the
top has a + charge and
the bottom has a
negative charge So
when they are
connected electrons
flow from the bottom to
the top
Static Electricity
bull You may have noticed that if you walk across the carpet in socks and then touch your catrsquos nose it will shock himher (it)
bull This is because you picked up some free electrons walking over the carpet (kind of like dust) and therefore gained a negative charge
bull Touching kittyrsquos nose allows you to dissipate that
charge (send the extra electrons to an area with
fewer electrons negative to positive)
bull The shock will continue until both surfaces are at
the same charge (neutralized)
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Static Electricity
bull You may have noticed that if you walk across the carpet in socks and then touch your catrsquos nose it will shock himher (it)
bull This is because you picked up some free electrons walking over the carpet (kind of like dust) and therefore gained a negative charge
bull Touching kittyrsquos nose allows you to dissipate that
charge (send the extra electrons to an area with
fewer electrons negative to positive)
bull The shock will continue until both surfaces are at
the same charge (neutralized)
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Touching kittyrsquos nose allows you to dissipate that
charge (send the extra electrons to an area with
fewer electrons negative to positive)
bull The shock will continue until both surfaces are at
the same charge (neutralized)
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Static electricity is a charge produced
by an excess of electrons
bull Electrons in the air will attach to moisture
in the air Thatrsquos why very dry air (like in
the winter or in the dryer) may hold a
large number of free electrons because
therersquos not much moisture for them to
attach to
ie Therersquos more static in the air in the winter
because there are more free electrons just
floating around
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Van der Graff generators basically induce a strong
electrical field (can be either positive or negative depending on
the setup) into a hollow metal sphere This field can
the release electrons into the surrounding air when
the voltage becomes great enough
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Voltage
bull A measure of the work associated with
moving an electric charge from one point
to another is called the voltage
bull 2 points can both have a tremendous
charge but if the charge is the same then
there will be no flow of electrons between
them
- - - - - -
- - - - - -
- - - - - -
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull The movement of electric charges is
called a current and is measured in
amperes (amps)
1 amp = 625 x 1018 electrons per sec
(6250000000000000000)
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull So letrsquos say that using a
voltmeter you determine
that there are no electrons
flowing from point A to point
B through an extension
cord connecting the two
Does that mean it is safe
for you to touch either of
the 2 points Hmmmhelliphellip
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull No There may be no electrons flowing
because the charges are the same
However your charge may be much
different which would allow the electricity
to flow into you
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Conductors and Insulators
bull Although an electric current can
occasionally jump from 1 point to another
it normally travels through a conductor A
conductor is any material which allows
electrons (electricity) to flow easily through
it
bull Metals in general are good conductors of
electricity
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Insulators are materials which prevent the flow of
electrons (electricity)
Some good insulators include rubber glass
wood and plastic
Any type of electric cord usually consists of a
metal conducting wire surrounded by a layer of
rubber or plastic insulation
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Resistors Materials called resistors can slow the flow of
electricity without stopping it all together
Almost all materials even good conductors provide at least a small amount of resistance to an electric current
Resistance is measured in ohms
W
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Direct Current (DC)
bull In most electrical
circuits the current will
flow in only 1 direction
This is called direct
current or DC
bull Examples of direct
current include
batteries lightning and
static electricity
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Lightning
bull Lightning is a form of direct current (DC)
produced by static electricity in clouds
bull The static is formed when air molecules
move past each other (just like clothes in a
dryer)
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull The negative charges group at the bottom of the cloud and transfer electrons to the ground which has taken on a positive charge
bull Why do you think the ground has taken on a positive charge
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Does lightning always travel from cloud to
ground Hmmmhelliphellip
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Alternating Current (AC)
bull An alternating current will send a
flow of electrons in 1 direction
through a circuit and then it will
reverse the flow in the other
direction
bull Household outlets are an example
of AC current They reverse the
direction of the current about 120
times per second
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull What would
happen if you stuck
one finger in one
side of an outlet
bull One finger in each
side
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Transformers
The AC which comes from your household
outlets usually has a voltage of about 120V
The voltage of the power lines outside
however is much higher Before entering
your house the electricity from the power
lines must pass through a transformer This
is a device which can increase or decrease
the voltage which exists between 2 points
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Transformers outside your house make the voltage
in your outlets safe for household appliances
bull Occasionally a lightning strike make take out a
transformer and send a power surge into your
house
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Step-up amp step-down transformers
bull Transformers can also increase the
voltage between 2 points
An amplifier and a stun gun are examples
of step-up transformers
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Electric Generators
bull The electricity supplied to
your home is produced by
an electric generator This
is a device which changes
mechanical (kinetic) energy
into electricity
bull Most electric power which is
generated in Missouri is
either from hydroelectric or
fossil fuel power plants
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Electric Motors
Electric motors are devices which convert electricity to mechanical energy
Most household appliance are examples of electric motors
Ex washing machine fan refrigerator
VCR dishwasher hair dryer etc
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Electric cars have engines which run on
electrical energy rather than chemical potential
energy (gasoline)
bull These cars are more efficient cleaner to
operate and decrease our dependency on fossil
fuels However the engines are not as powerful
and the cars have a limited range
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Batteries Electric motors are usually specified to run on
either alternating current or direct current
(produced by batteries)
A battery is a device containing an electric cell
or a series of electric cells storing energy that
can be converted into electrical power
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Batteries can be composed of a liquid electrolyte
(a liquid or paste which will conduct an electric
current) (wet cell) or a paste electrolyte (dry cell)
Whether liquid or paste the electrolytes are
usually acidic
Car and boat batteries are examples of wet cells
flashlight batteries are examples of dry cells
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull A chemical reaction inside the battery pulls electrons away from 1 of the terminals and gives them to the other This causes 1 terminal to be negative (-) and the other to be positive (+)
bull When these terminals are connected through a device they produce a flow of electrons from negative to positive which power the device
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Electric Circuits
bull A circuit is a pathway along which an
electric current can travel en route to a
device
bull Locating a device along that pathway will
allow it to be powered by the electric
current
bull There are 2 different types of circuits
series and parallel
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Series Circuit
bull A series circuit is one
which has only 1 pathway
for electricity to flow All
devices are located along
this single pathway and
any break in the circuit will
stop the flow of electricity
bull Ex old type Christmas
tree lights
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Parallel Circuits
bull A parallel circuit has
multiple paths which the
electricity can travel down
with different devices
along the different paths
bull If one pathway is open or
broken the others can still
carry electricity
Ex newer Christmas tree
lights household circuits
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Schematic Diagrams
bull A schematic diagram
uses symbols to
show electrical
circuits and wiring
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull A short circuit
occurs when the
current stops short
of the intended
device usually
because of the
circuit being
completed prior to
reaching the device
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull A circuit breaker is a device which prevents too much electricity from flowing through a circuit Breakers can be reset usually with the flip of a switch
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Fuses do the same thing as a breaker but they
use a small wire connector which will burn out if
the flow of electricity is too high Fuses usually
have to be replaced after they burn out Fuses
are often found in electric appliances also
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Electromagnets
bull An electromagnet is a temporary
magnet made by passing an
electric current through a wire
coiled around a metal core
Electromagnets have 2 advantages
over normal magnets
1 They can be turned on
and off
2 Their strength can vary
based on the amount of
current flowing
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Examples of electromagnets include
cranes in scrap yards telegraphs and
certain types of doorbells
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
History of Electricity
600 BC-Thales discovered
static electricity
1600 - William Gilbert names
the force electricity
Mid 1700s - Ben Franklin shows
that lightning is made of
electricity and does numerous
experiments
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
1800 - Volta makes
first battery
1878 - T Edison creates
electric light bulb
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
1943 - First computer
(ENIAC) created
1942 - Fermi produces the
first fission reaction
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull The Van De Graff generator in class produced
around 15000 v of electricity while a typical
household outlet produces only 120 v
Therefore yoursquore safer sticking your finger in
an outlet
Righthelliphelliphelliphellip Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull An automated external defibrillator (AED)
which is similar to the manual defibrillator
often seen used by EMTrsquos is a portable
device used to diagnose and treat victims of
cardiac arrest
How do you think this device works
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Luigi Galvani was
cooking frog legs in
an iron skillet He
noticed that when he
picked one up with
copper tongs to flip it
over sometimes it
would ldquokickrdquo as if it
were still alive Why
do you think this
occurred
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Draw a schematic diagram of a circuit with
a power source 1 switch 2 individual
devices along a series circuit and 3
devices on separate branches of a parallel
circuit
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull The step-down transformer shown below has 8
coils of wire on the primary side and 4 coils
going out on the secondary side If this
transformer is hooked up to a typical household
outlet how many volts will be produced
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Why do you think
most gas pump
handles are
coated in either
rubber or plastic
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull What purpose do you think the yellow connectors
on the electric fence shown below serve
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull The device shown below is an electronic
body fat tester The subject holds the tester
by the handles and a weak electric current is
passed through their body How do you think
this is able to determine their percentage of
body fat
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Although both
dangerous a lightning
strike near the beach in
Miami may be more
potentially hazardous
than the same strike at
Truman Lake Why do
you think this is so
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull A car battery (wet cell) works similar to the
voltaic piles which we built in class
Do you think it would be possible to build a
voltaic pile out of our
lab materials big
enough to have
the same power
as a car battery
Why or why not
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull What is the object shown and how do
you think it works
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
Shown below is a ground fault circuit interrupter
(GFCI) outlet Whatrsquos special about it how
does it work and where might one be found
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull In the picture below what is the charge of
the ground How do you know
bull Is the man in the car safe or in danger Explain
bull Is the man in the car safe or in danger Explain
