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# Ohms law

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### Ohms law

1. 1. OHMS LAW
2. 2. Ohm’s Law Quiz Voltage Example Current Circuit Resistance Resistor
3. 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. 4. CURRENT Current refers to the quantity/volume of electrical flow. Measured in Amps (A)
5. 5. VOLTAGE (V) It is the push or pressure behind current flow through a circuit, and is measured in (V) volts.
6. 6. RESISTANCE Resistance to the flow of the current. Measured in Ohms
7. 7. Chart
8. 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. 9. How do we used Ohms law
10. 10. • V (E) = I x R •I=V R R=V I
11. 11. How do calculate? Battery voltage is 12V Current is Amp ? Resistance 2 Ohm
12. 12. How to calculate? Voltage is 12V Current is 4 Amps Resistance Ohms ?
13. 13. What can we use to measure? Multi meters/ DVOM
14. 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. 15. Resistors
16. 16. Resistor color chart
17. 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. 18. Different types of circuit Series circuit : One pathway for current to flow. Example: Old Christmas lights
19. 19. Parallel Circuit More then one path way for current to flow. Used in most electrical vehicle circuits.
20. 20. Series and Parallel Circuits 12
21. 21. Parallel resistance circuit
22. 22. What it looks like