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Energy and Power

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

500 mW
50 mW
5,000 mW
5 mW

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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%
85.7%
4.28%
8.57%

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Energy and Power
How much continuous current can be drawn from a 60 Ah battery for 14 h?

4.28 A
428 A
42.8 A
4.2 A

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

12 V
1.2 V
120 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
1.3 kWh
12 kWh
13.3 kWh

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Energy and Power
The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be

2 W
5 W
1 W
0.5 W

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