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Energy and Power

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

5.6 Wh
56.25 Wh
0.938 Wh
938 Wh

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Energy and Power
A 120 resistor must carry a maximum current of 25 mA. Its rating should be at least

480 mW
4.8 W
15 mW
150 mW

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

2 W
200 W
2,000 W
20 W

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

1.3 kWh
13.3 kWh
1.2 kWh
12 kWh

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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?

neither resistor
330
33
both resistors

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