1. Today’s Agenda… Work from yesterday
Bellringer/Quiz – You need a clean sheet of paper numbered 1-5
Review
Notes on Electrical Energy

2. Question #1
What happens to the particles in a substance as it is heated?
A. They slow down
B. They speed up
C. They stop moving
D. They lose energy

3. Question #2
Which of the following is a true statements about heat transfer?
A. Heat ALWAYS flows from warmer to cooler objects
B. Heat ALWAYS flows from cooler to warmer objects
C. Heat NEVER travels in a similar pattern
D. Heat does not move

4. Question #3 What happens to an object that loses heat?
A. It cools down
B. It warms up
C. It stays the same temperature
D. It disappears

5. Question #4
What type of heat transfer occurs when you burn your tongue on hot soup?
A. conduction
B. convection
C. radiation
D. reflection

6. Question #5
When you hold your hand over a hot burner without touching it, the heat can still travel to your hand through _____.
A. conduction
B. convection
C. radiation
D. reflection

7. Review from Wednesday
How do we know that energy is involved in chemical reactions?
What are the two types of chemical reactions?
Why is baking a cake an endothermic reaction?
Why is burning wood an exothermic reaction?

8. Electrical Energy
Study Pack #8

9. Today’s Goals…
I can explain how electrical energy is transferred in a circuit.
I can describe how an electric current flows.

10. What is an electrical current?
The flow of electrical charges
The flow of electrons along a wire

11. 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

12. 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

13. A Simple Electric Current
Electric current will flow continually in a CLOSED path called an electrical circuit
A circuit includes:
Wire
Energy source
A receiver (light, fan, motor)
A switch (not required)

14. 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

15. Conductors and Insulators
Conductors allow electrons to move through them (metals)
Insulators do not allow electrons to move through them (plastic, rubber)
The wires are usually made of metal wrapped with plastic

16. 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

17. Making Electric Charges Flow
A battery can produce an electric field
Chemical reactions cause the negative end to become more negative and the positive end to become more positive
Electrons flow from the negative end to the positive end

18. Exit Slip On a post-it note list the following:
One thing you learned from the lesson today
One question you still have about the lesson today
Put it on the bulletin board when the bell rings