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Video. http://www.youtube.com/watch?v=E27XDNf2cxc. OHMS LAW . 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. VOLTAGE (V).

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  1. Video http://www.youtube.com/watch?v=E27XDNf2cxc

  2. OHMS LAW

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

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

  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. RECAP!! • What is Voltage? • What is Current? • What is Resistance?

  10. Part 2 • http://www.youtube.com/watch?v=eZ9Xk0Lln5Y&feature=related • Stop at 1 Min mark

  11. How do we used Ohms law

  12. V (E) = I x R • I = V R R = V I

  13. How do calculate? • Battery voltage is 12V • Current is Amp ? • Resistance 2 Ohm

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

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

  16. 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

  17. Resistors

  18. Resistor color chart

  19. RECAP!! • What is Voltage? • What is Current? • What is Resistance? http://www.youtube.com/watch?v=nj7ewZmG3eo&feature=related

  20. Part 3 • http://www.youtube.com/watch?v=YB_JCUw9SoU&feature=related

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

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

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

  24. Series and Parallel Circuits 12

  25. Parallel resistance circuit

  26. What it looks like

  27. 1997 Headlight circuit

  28. RECAP!! • What is Voltage? • What is Current? • What is Resistance? • What are wiring diagrams? • What are the different circuits and there characteristics?

  29. QUIZ

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