1. Video

2. OHMS LAW

3. What is ohms law?
Ohm’s Law explains the relationship between voltage (V ), current (I) and resistance (R)
Used by electricians, automotive technicians, stereo installers

4. VOLTAGE (V)
It is the push or pressure behind current flow through a circuit. Measured in (V) volts. 

5. How you should be thinking about electric circuits:
Voltage: a force that pushes the current through the circuit (in this picture it would be equivalent to gravity)

6. CURRENT Current refers to the quantity of electrical flow.
Measured in Amps (A)

7. How you should be thinking about electric circuits:
Current: the actual “substance” that is flowing through the wires of the circuit (electrons!)

8. RESISTANCE
 Resistance to the flow of the current. Measured in Ohms

9. How you should be thinking about electric circuits:
Resistance: friction that impedes flow of current through the circuit (rocks in the river)

10. Chart

11. General Rule. 1. Assuming the resistance does not change:
As voltage increases, current increases.
as voltage decreases, current decreases.
2.  Assuming the voltage does not change:
As resistance increases, current decreases.
As resistance decreases, current increases.

12. Part 2 http://www.youtube.com/watch?v=eZ9Xk0Lln5Y&feature=related
Stop at 1 Min mark

13. How do we used Ohms law

14. V = I x R
I = V R
R = V I

15. How do calculate? Battery voltage is 12V Resistance 2 Ohm
What is the Current?

16. How to calculate? Voltage is 12V Current is 4 Amps
What is the Resistance? ____Ohms?

17. What can we use to measure?
Multi meters/ DVOM

18. Resistors Why do we need resistors
To decrease the amount of voltage applied to a component
The value of the resistor is marked on the body using coloured rings

19. Resistors

20. RECAP!! What is Voltage? What is Current? What is Resistance?

21. Part 3

22. Different types of circuit
Series circuit :
One pathway for current to flow.
Example: Old Christmas lights

23. Parallel Circuit More then one path way for current to flow.
Used in most electrical vehicle circuits.