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Energy and Power

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

85.7%
42.85%
8.57%
4.28%

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

6 V
1.2 V
120 V
12 V

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

5 mW
5,000 mW
50 mW
500 mW

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Energy and Power
Three hundred joules of energy are consumed in 15 s. The power is

200 W
2,000 W
20 W
2 W

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Energy and Power
If you used 600 W of power for 60 h, you have used

1 kWh
3.6 kWh
10 kWh
36 kWh

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

56.25 Wh
0.938 Wh
938 Wh
5.6 Wh

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MORE MCQ ON Energy and Power

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