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Energy and Power

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

73.3 V
257 V
25.7 V
2.5 V

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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
both resistors
33

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Energy and Power
For 12 V and 40 mA, the power is

480,000 µW
480 mW
All of these
0.480 W

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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

2 W
5 W
1 W
0.5 W

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

1.2 V
120 V
12 V
6 V

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