Dc Theory Level 2 Lesson 5

Question: Power delivered to a DC circuit is the measure of the amount of ? the circuit per unit of time.

current flow

horsepower

voltage drop in

work done by

Answer: d. work done by

Question: When reviewing the power consumed by the circuit, what are the two possible ways in which the power is consumed?

Answer: b. Heat / useful work

Question: The sum of the power dissipated by each resistor in a series circuit is equal to the ? .

Select one:

  1. total current in the series branch

  2. b. total power

  3. c. total resistance

  4. d. voltage times the resistance

  5. Answer: b. total power

  6. Question: Decreasing the voltage applied to a standard wattage lamp below that recommended by the manufacturer would result in a decrease in the amount of power consumed by the lamp.

  7. Select one:

  8. True

  9. False

  10. Answer: True

  11. Question: What would happen to a resistor if it was subjected to voltages or currents which caused it to dissipate more power than the value for which it was rated?

  12. Select one:

  13. a. The resistance value would increase.

  14. b. The resistance value would decrease.

  15. c. It would be damaged.

  16. d. None of the above.

  17. Answer: c. It would be damaged.

  18. Question: Which formula would be used to find the maximum current that can be carried by a resistor if the resistor’s resistance and wattage rating are known?

  19. Select one:

  20. a. I = RxP

  21. b. I = P / R

  22. c. I = square root R / P

  23. d.I = square root P / R

  24. Answer: d.

  25. Question: The total power requirement in a series circuit is the sum of the powers of the individual components in that circuit.

  26. Select one:

  27. True

  28. False

  29. Answer: True

  30. Question: As the current through a series circuit increases, the total power dissipated in each component decreases.

  31. Select one:

  32. True

  33. False

  34. Answer: False

  35. Question: Which is the formula used to determine the total power in a series circuit, when the total resistance and current of that circuit are known?

  36. Select one:

  37. a. Pt = Rt x Et

  38. b. Put = It x Rt squared

  39. c. Pt = square root of Rt / It

  40. d. Pt = It squared x Rt

  41. Answer: d.

  42. Question: If the current through a resistor is reduced by one-half, the power being dissipated by the resistor will be ? of the original power.

  43. Select one:

  44. a. 1/8

  45. b. 1/4

  46. c. 1/2

  47. d. 3/4

  48. Answer: b. 1/4

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