Energy And Power(Electrical Engineering ) Questions and Answers

Question 1. A 220 Ω resistor dissipates 3 W. The voltage is
  1.    73.3 V
  2.    2.5 V
  3.    25.7 V
  4.    257 V
Explanation:-
Answer: Option C. -> 25.7 V
Question 2. How many watt-hours represent 65 W used for 18 h?
  1.    11.7 Wh
  2.    1,170 Wh
  3.    11,700 Wh
  4.    117,000 Wh
Explanation:-
Answer: Option B. -> 1,170 Wh
Question 3. For 12 V and 40 mA, the power is
  1.    480 mW
  2.    0.480 W
  3.    480,000 µW
  4.    All of the above
Explanation:-
Answer: Option D. -> All of the above
Question 4. If you used 400 W of power for 30 h, you have used
  1.    1.3 kWh
  2.    13.3 kWh
  3.    1.2 kWh
  4.    12 kWh
Explanation:-
Answer: Option D. -> 12 kWh
Question 5. Energy equals power multiplied by time.
  1.    True
  2.    False
Explanation:-
Answer: Option A. -> True
Question 6. Watt's law states the relationships of power to energy.
  1.    True
  2.    False
Explanation:-
Answer: Option B. -> False
Question 7. A 3.3 kΩ resistor dissipates 0.25 W. The current is
  1.    8.7 mA
  2.    87 mA
  3.    8.7 µA
  4.    8.7 A
Explanation:-
Answer: Option A. -> 8.7 mA
Question 8. At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
  1.    1.286 kWh
  2.    12.85 kWh
  3.    535 kWh
  4.    252 kWh
Explanation:-
Answer: Option A. -> 1.286 kWh
Question 9. How much continuous current can be drawn from a 60 Ah battery for 14 h?
  1.    42.8 A
  2.    428 A
  3.    4.28 A
  4.    4.2 A
Explanation:-
Answer: Option C. -> 4.28 A
Question 10. A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is
  1.    8.57 %
  2.    42.85 %
  3.    4.28 %
  4.    85.7 %
Explanation:-
Answer: Option D. -> 85.7 %
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