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Energy and Power

Energy and Power
A 3.3 k resistor dissipates 0.25 W. The current is

8.7 µA
8.7 A
87 mA
8.7 mA

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

1 kWh
10 kWh
3.6 kWh
36 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

42.85%
85.7%
8.57%
4.28%

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Energy and Power
A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is

58 Ah
21 Ah
0.58 Ah
2.1 Ah

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

120 V
12 V
6 V
1.2 V

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

4.2 A
42.8 A
428 A
4.28 A

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