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Energy and Power

Energy and Power
A 15 V source is connected across a 12 resistor. How much energy is used in three minutes?

938 Wh
0.938 Wh
56.25 Wh
5.6 Wh

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Energy and Power
A half-watt is equal to how many milliwatts?

50 mW
500 mW
5,000 mW
5 mW

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Energy and Power
A 33 half-watt resistor and a 330 half-watt resistor are connected across a 12 V source. Which one(s) will overheat?

both resistors
neither resistor
330
33

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Energy and Power
A 75 load uses 2 W of power. The output voltage of the power supply is approximately

1.2 V
120 V
12 V
6 V

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Energy and Power
If you used 400 W of power for 30 h, you have used

1.2 kWh
13.3 kWh
1.3 kWh
12 kWh

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

8.57%
85.7%
4.28%
42.85%

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