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Voltage

Voltage. Chapter 3. Voltage (V or E). Supplies the force or pressure required to move electrons through a circuit. AKA – Electromotive Force EMF. Unit – Volt (V). Voltage Sources. Friction – Van de Graaf Generator. Voltage Source. Generator – Most Common. Voltage Source.

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Voltage

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  1. Voltage Chapter 3

  2. Voltage (V or E) Supplies the force or pressure required to move electrons through a circuit. AKA – Electromotive Force EMF Unit – Volt (V)

  3. Voltage Sources Friction – Van de Graaf Generator

  4. Voltage Source Generator – Most Common

  5. Voltage Source Cell – Battery: Chemical Reaction

  6. Voltage Source Photovoltaic Cell Light → Voltage

  7. Voltage Source Thermocouple Heat → Voltage

  8. Voltage Source Piezoelectric Effect Pressure → Voltage

  9. Cells and Batteries Primary Cells Cannot be Recharged

  10. Cells and Batteries Secondary Cells Can be Recharged

  11. Connecting Voltage Sources Series Opposing Series Aiding - + - + - - + +

  12. Voltage Sources Voltage sources added in Series increase the Voltage and the Current stays the same. V = 1.5v I = 1A V = 4.5v I = 1A

  13. V = 4.5v I = 1A

  14. Voltage Sources Voltage sources added in Parallel increase the Current and the Voltage stays the same. V = 1.5v I = 1A V = 1.5v I = 3A

  15. V=1.5v I =3A

  16. I=1A I=1A I=1A V=3v Example Battery: V = 1.5v, I = 1A V=3v I= 3A

  17. V=3v I=3A

  18. VT = 9v and IT = 500ma Battery: V = 1.5v and I = 100mA 100mA 100mA 100mA 100mA 100mA VT = 9v IT =500mA 9v

  19. VT = 9v IT =500mA

  20. Voltage Rise Voltage Rise can be defined as the energy added to a circuit. 

  21. Voltage Drop A Voltage Drop is defined as the energy removed or used in a circuit.

  22. Voltage Drop

  23. Earth Ground • Zero Voltage reference point. • Limits build up of electrical charge. • Limits exposure to high voltages.

  24. Electrical Ground Ground is defined as the zero reference point which against all voltages are measured.

  25. Electrical Ground in a Car

  26. Jumping a Car Bad Battery

  27. V R I = Ohm’s Law The Current(I) in a circuit is directly proportional to the Voltage(E,V) and inversely proportional to the Resistance(R).

  28. V I R Ohm’s Law Find: V V = IxR

  29. V I R Ohm’s Law Find: R R = V/I

  30. V I R Ohm’s Law Find: I I = V/R

  31. Vv IA RΩ Ohm’s Law Units

  32. V(v) ImA RkΩ Ohm’s Law Units

  33. Vv IA RΩ Ohm’s Law Example R=2Ω, V=12v Find: I I = V/R =12v/2Ω I = 6A

  34. Vv ImA RkΩ Ohm’s Law Example V=120, I=60mA Find: R R = V/I =120v/60mA R = 2kΩ

  35. Vv ImA RkΩ Ohm’s Law Example R=10kΩ, I=12mA Find: V V = IxR =12mAx10kΩ V = 120v

  36. Vv Vv ImA IA RkΩ RΩ Wheel of Answers

  37. Power Power is how fast work is done. Work is done when force causes motion. Electric Force: Voltage Moving: Electrons

  38. P = IV Power Power: P Unit for Power: Watt Watt: W

  39. P I V Power Law Find: P P = IxV

  40. P I V Power Law Find: V V = P/I

  41. P I V Power Law Find: I I = P/V

  42. PW IA VV Power Law Units

  43. PmW ImA VV Power Law Units

  44. How much power does a 12V computer fan use if it is drawing 1.5A? P=IV V = 12V I = 1.5A P=(1.5A)(12V) P = (18W)

  45. V I R Combining Ohm’s and Power Laws P = I2R V2 R P =

  46. Classwork • Read the following Chapters: • Chapter 2: All • Chapter 3: All • Chapter 4: Pages 32-44 • Chapter 5: Pages 49-52 • Answer the questions after each section: Write down question and answer!!! • Perform Self-Test at the end of the chapter Write down question and answer!!!

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