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Electrical Engineering
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Energy and Power
Comments
Question
A 220 Ω resistor dissipates 3 W. The voltage is
Options
A. 73.3 V
B. 2.5 V
C. 25.7 V
D. 257 V
Correct Answer
25.7 V
Energy and Power problems
Search Results
1. If you used 400 W of power for 30 h, you have used
Options
A. 1.3 kWh
B. 13.3 kWh
C. 1.2 kWh
D. 12 kWh
Show Answer
Scratch Pad
Discuss
Correct Answer: 12 kWh
2. If you used 600 W of power for 60 h, you have used
Options
A. 36 kWh
B. 3.6 kWh
C. 10 kWh
D. 1 kWh
Show Answer
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Discuss
Correct Answer: 36 kWh
3. The unit of electrical charge is the
Options
A. volt
B. ampere
C. joule
D. coulomb
Show Answer
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Discuss
Correct Answer: coulomb
4. An ohmmeter is an instrument for measuring
Options
A. current
B. voltage
C. resistance
D. wattage
Show Answer
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Discuss
Correct Answer: resistance
5. When placed close together, two positively charged materials will
Options
A. attract
B. become neutral
C. become negative
D. repel
Show Answer
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Discuss
Correct Answer: repel
6. A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is
Options
A. 8.57%
B. 42.85%
C. 4.28%
D. 85.7%
Show Answer
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Correct Answer: 85.7%
7. A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately
Options
A. 120 V
B. 1.2 V
C. 12 V
D. 6 V
Show Answer
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Correct Answer: 12 V
8. In 0.025 W, there are
Options
A. 25 kW
B. 0.00025 mW
C. 2,500 µW
D. 25 mW
Show Answer
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Discuss
Correct Answer: 25 mW
9. How many watt-hours represent 65 W used for 18 h?
Options
A. 11.7 Wh
B. 1,170 Wh
C. 11,700 Wh
D. 117,000 Wh
Show Answer
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Discuss
Correct Answer: 1,170 Wh
10. A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?
Options
A. 938 Wh
B. 0.938 Wh
C. 56.25 Wh
D. 5.6 Wh
Show Answer
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Discuss
Correct Answer: 0.938 Wh
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Ohm's Law
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Passive Filters
Quantities and Units
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