1. OHMS LAW

2. Ohm’s Law
Quiz
Voltage
Example
Current
Circuit
Resistance
Resistor

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

4. CURRENT
Current refers to the
quantity/volume of electrical flow.
Measured in Amps (A)

5. VOLTAGE (V)
It is the push or pressure behind
current flow through a circuit, and
is measured in (V) volts.

6. RESISTANCE
Resistance to the flow of the
current. Measured in Ohms

7. Chart

8. 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.

9. How do we used Ohms law

10. • V (E) = I x R
•I=V
R
R=V
I

11. How do calculate?
Battery voltage is 12V
Current is Amp ?
Resistance 2 Ohm

12. How to calculate?
Voltage is 12V
Current is 4 Amps
Resistance Ohms ?

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

14. 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

15. Resistors

16. Resistor color chart

17. Load
What is a load
It is a any electric load on a circuit that
does work.
Example: Power windows, light
bulbs, motors.

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

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

20. Series and Parallel Circuits
12

22. Parallel resistance circuit

24. What it looks like

25. 1997 Headlight circuit

27. QUIZ

28. QUIZ
What is Voltage?
What is Current?
What is Resistance?
What are wiring diagrams?
What are the different circuits
and there characteristics?