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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?

938 Wh
5.6 Wh
56.25 Wh
0.938 Wh

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Energy and Power
A 220 resistor dissipates 3 W. The voltage is

73.3 V
25.7 V
2.5 V
257 V

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

500 mW
5 mW
50 mW
5,000 mW

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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

5 W
2 W
1 W
0.5 W

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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?

330
both resistors
neither resistor
33

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Energy and Power
A 6 V battery is connected to a 300 load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?

10 h
200 h
2,000 h
1 h

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