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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?

0.938 Wh
938 Wh
5.6 Wh
56.25 Wh

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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
6 V
120 V
12 V

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Energy and Power
A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is

226 mW
22.6 mW
13.2 mW
132 mW

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Energy and Power
When the current through a 12 k resistor is 8 mA, the power is

7.68 mW
7.68 W
768 mW
76.8 W

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

20 W
200 W
2 W
2,000 W

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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

42.85%
4.28%
85.7%
8.57%

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MORE MCQ ON Energy and Power

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