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Ohms law

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Transcript

  • 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
  • 21. Parallel resistance circuit
  • 22. What it looks like
  • 23. 1997 Headlight circuit
  • 24. QUIZ
  • 25. QUIZ What is Voltage? What is Current? What is Resistance? What are wiring diagrams? What are the different circuits and there characteristics?