Circuits

Warm-up

What type of energy is the energy stored in batteries?

A.KineticB.ElasticC.ChemicalD.Thermal

What type of energy did we show with your spinning windmills

Kinetic / potential ?

Renewable / Non-renewable Resource?

KEY “UPCOMING” TermsStatic electricityLaw of conservation of chargeElectric fieldConductorInsulatorCharging by contactCharging by inductionGrounding

ElectroscopesElectric currentElectric circuitsDry cell batteriesWet cell batteriesLead cell batteries

Static electricity

The accumulation of excess electric charge on an object

Law of Conservation of Charge

States that charge can be transferred from object to object

BUT

It cannot be created NOR destroyed

Electric field

An electric field surrounds every electric charge and exerts the force that causes other electric charges to be attracted or repelled.

Conductor

Is a material through which electrons move easily.

Insulator

An insulator is a material in which electrons are not able to move easily.

WHY?

Electrons are held more tightly to the atoms that make up insulators.

WHOLE BRAIN

In a minute..you will turn to your partner and discuss

-Static electricity -Law of conservation of Charge - Electric field -conductors (name 1) - Insulators (name 2)

Charging by Contact

The process of transferring charge by touching or rubbing.

Charging by Induction

The rearrangement of electrons on a neutral object caused by a nearby charged object.

LightningThundercloud = “mighty” static electricity

generator

LightningThundercloud = “mighty” static electricity

generator

Areas of positive / negative charge build up

LightningThundercloud = “mighty” static electricity generatorAreas of positive / negative charge build upStatic discharge between the clouds and the ground happens.

Grounding

Before you mess with wires (electricians)….you must ground yourself …by touching a piece of metal

GroundingBefore you mess with wires (electricians)….you

must ground yourself …by touching a piece of metal

Your house can be grounded to…….metal lightening rod that provides a conducting path from the highest point…..to the ground

WHOLE BRAIN

In a minute, you will turn to your partner and discuss

-Charging by contact - Charging by induction - Lightening - Grounding (electricians) - grounding (for houses)

Electroscope

A device that can detect electric charge

Electric Circuit

Is a closed path that electric current flows.

Current = electrons

Voltage Difference

Is related to the force that causes electric charges to flow.

Voltage DifferenceIs related to the force that causes

electric charges to flow.

Voltage difference is measured in volts (V).

QUESTION

What does closed mean?

Hold up your hands and show a closed circle……..

Closed circuits• Closed circuits is circuits where the electricity

is flowing……..no gap……electricity can go all the way around in a circle.

• Closed circuits = Everything works (light bulb is on)

Question

What does open mean?

Hold up your hands and show an open circle….

Open circuit

• An open circuits is when the electricity can not flow (since it needs to go all the way around in a circle to flow)

• Open circuits = nothing works (light bulb is off)

QUESTION

So TO RECAP…….which circuit the the lightbulb not light?

And WHY?

WHOLE BRAIN

In a minute, you will turn to your partner and discuss

-electroscope - electric Circuit - Voltage difference - Closed circuit - Open circuit

Dry cell battery

Example: batteries

The cell has 2 electrodes surrounded by a material called an electrolyte.

Electrolyte = moist paste

Wet cell battery

Example: Car battery

Contains 2 connected plates made up of different metals or metallic compounds in an electrolyte.

ELECTROLYTE = conducting liquid solution

Lead Acid batteries

Contains a series of six wet cells composed of lead and lead dioxide plates in a sulfuric acid solution.

Example: car batteries/others

WHOLE BRAIN

In a minute, you will turn to your partner and discuss

-electroscope - electric Circuit - Voltage difference - Closed circuit - Open circuit

STOP

COLLABORATIVE ACTIVITY TIME