Energy And Power MCQ Questions & Answers | Electrical Engineering

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1.
A 220 Ω resistor dissipates 3 W. The voltage is

A. 73.3 V

B. 2.5 V

C. 25.7 V

D. 257 V

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2.
If you used 400 W of power for 30 h, you have used

A. 1.3 kWh

B. 13.3 kWh

C. 1.2 kWh

D. 12 kWh

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3.
For 12 V and 40 mA, the power is

A. 480 mW

B. 0.480 W

C. 480,000 µW

D. All of the above

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4.
How many watt-hours represent 65 W used for 18 h?

A. 11.7 Wh

B. 1,170 Wh

C. 11,700 Wh

D. 117,000 Wh

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5.
Energy equals power multiplied by time.

A. True

B. False

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6.
Watt's law states the relationships of power to energy.

A. True

B. False

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7.
A 3.3 kΩ resistor dissipates 0.25 W. The current is

A. 8.7 mA

B. 87 mA

C. 8.7 µA

D. 8.7 A

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8.
A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is

A. 8.57 %

B. 42.85 %

C. 4.28 %

D. 85.7 %

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9.
How much continuous current can be drawn from a 60 Ah battery for 14 h?

A. 42.8 A

B. 428 A

C. 4.28 A

D. 4.2 A

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10.
At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?

A. 1.286 kWh

B. 12.85 kWh

C. 535 kWh

D. 252 kWh

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