Today’s Agenda…11/17

• Bellringer: Worksheet

• Review Note-taking Worksheet & Discuss

• Notes on Electric Current Part I

Electric Current Part I

Study Pack #10

Review

• A material through which electrons can move easily is a _____.

• A. conductor

• B. insulator

• C. nucleus

• D. electromagnetic

Review

• Each of the following is an example of an insulator except _____.

• A. wood

• B. copper

• C. glass

• D. rubber

Review

• An atom has equal numbers of protons and _____.

• Neutrons

• Electrons

• Ohms

• Volts

Review

• Every proton and electron is surrounded by a(n) _____.

• A. electric circuit

• B. electric field

• C. insulator

• D. magnetic pole

Today’s Goals…

• I can describe how an electric current flows.

• I can explain how electrical energy is transferred in a circuit.

• Study Pack #10

• Page 201

What do you know?

• True or False– In a wire there is an electric current

when protons in the wire move along the wire.

– The unit for electric current is the ampere.

– Electric currents will flow when a switch is open.

– Batteries can produce an electric field that makes electric charges flow.

What is an electrical current?

• The flow of electrical charges

• Electrons move along the wire

Unit for Current

• The amount of electrical current in a wire is the amount of charge that flows into and out of the wire every second

• The unit for current is the ampere, A• 1 ampere of electric current means

about six billion billion electrons flowing into and out of the wire every second

A Simple Electric Current

• Electric energy can be transformed into heat, light, and sound energy

• To watch tv energy must be constantly transformed

• The electric current must be kept flowing

A Simple Electric Current

• Electric current will flow continually in a CLOSED path called an electrical circuitelectrical circuit

A Simple Electric Circuit

• An electrical circuit is made up of: – wire, which connects the parts

together– an energy source, such as a

battery– a receiver, such as a fan,

lightbulb, or motor– a switch (not required)

A Simple Electric Current

• Current flows as long as the switch is closed

• When the switch is open, current no longer flows

• If one of the wires are cut or the light bulb is unscrewed the current will not flow

Making Electric Charges Flow

• A force must be exerted on electric charges to make them flow

• Force is exerted on an electric charge by an electric field

• There is an electric field in the circuit that will move electrons in a single direction

Making Electric Charges Flow

• A battery can produce an electric field

– Electrons flow from the negative end to the positive end

What did you learn?

• True or False– In a wire there is an electric current

when protons in the wire move along the wire.

– The unit for electric current is the ampere.

– Electric currents will flow when a switch is open.

– Batteries can produce an electric field that makes electric charges flow.