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Energy and Power

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

58 Ah
2.1 Ah
21 Ah
0.58 Ah

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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

0.5 W
2 W
1 W
5 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

85.7%
42.85%
4.28%
8.57%

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

76.8 W
7.68 mW
768 mW
7.68 W

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Energy and Power
At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?

535 kWh
12.85 kWh
252 kWh
1.286 kWh

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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
1 h
2,000 h

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