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
  23. 23. 1997 Headlight circuit
  24. 24. QUIZ
  25. 25. QUIZ What is Voltage? What is Current? What is Resistance? What are wiring diagrams? What are the different circuits and there characteristics?

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