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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

12 V
120 V
1.2 V
6 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?

938 Wh
5.6 Wh
0.938 Wh
56.25 Wh

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Energy and Power
In 0.025 W, there are

25 kW
2,500 µW
0.00025 mW
25 mW

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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?

1 h
2,000 h
200 h
10 h

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

12 kWh
13.3 kWh
1.2 kWh
1.3 kWh

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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?

252 kWh
12.85 kWh
1.286 kWh
535 kWh

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