1. QQ
Two wires of equal length are made from the same material. How is it possible for the wires to have different resistances?
If a circuit has a voltage of 45 V and a current of 5.0 A, what is the resistance?

2. Thickness, Temperature, and length
Two wires of equal length are made from the same material. How is it possible for the wires to have different resistances?
Think: What characteristics affect a conductors ability to pass the charges (resistance)?
Thickness, Temperature, and length

3. Temperature * Higher temp means more energy  vibration
* e- trying to move, can pass around still protons easier
* Length  shorter is faster

4. QQ
If a circuit has a voltage of 45 V and a current of 5.0 A, what is the resistance?
V = I R
45 = 5 * R
V = 45 Volts
45 = 5 * R
Current = I = 5 Amp
R = ?
9 ohms = R

5. Objective: I understand the relationship between Power and Current

6. Electrical Power:
Amount of work electricity can do
Watts

7. V= 120 Volts I = 2.2 Amps P = ? P = VI P =120 * 2.2 P = 264 Watts
Luke’s stereo receiver uses a current of 2.2 amps from a
120-volt line. What is its power?
V= 120 Volts
I = 2.2 Amps
P = ?
P = VI
P =120 * 2.2
P = 264 Watts

8. Direct Current:
Only flows in 1 direction
Example: batteries)

9. Alternating Current:
Flow regularly reverses direction
Example: Household currents

10. AC/DC ????

11. Series Circuit: 1 Path
One element doesn’t work, nothing works. The current stops.

12. Parallel Circuit:
More than 1 path
One element doesn’t work, the current goes around it.

14. Circuit Diagrams:
Show the flow of electricity

15. Wire & Power Source (battery)
Draw A Simple Circuit:
Wire & Power Source (battery)

16. Add Switch:

17. Add Resistance:

18. Add Light Bulb

19. Create A Series circuit with a switch, a battery, and 2 light bulbs.

20. Create A Parallel Circuit with a battery, 2 light bulbs, and NO switch.

21. Create A Parallel Circuit with 3 bulbs, a switch and 2 connected batteries.

22. Create A Series Circuit with 3 lights, a battery and a switch
Create A Series Circuit with 3 lights, a battery and a switch. Label the lamps A, B, & C.

23. An Electric Highway

24. Hyperlink to 12 minute video followed by quiz