Ohm's Law describes the relationship between voltage, current, and resistance in an electrical circuit. Voltage is the "push" of electricity and is measured in volts. Current is the flow of electricity and is measured in amps. Resistance opposes the flow of current and is measured in ohms. Ohm's Law states that current is directly proportional to voltage and inversely proportional to resistance. Using Ohm's Law, the voltage, current, or resistance in a circuit can be calculated if two of the three values are known. Resistors are used to decrease voltage in a circuit and are marked with color bands to indicate their resistance value. Circuits can be connected in series or parallel, and understanding circuit diagrams

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?