ENERGY AND POWER QUIZ

A 3.3 k resistor dissipates 0.25 W. The current is

8.7 µA

87 mA

8.7 mA

8.7 A

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If it takes 400 ms to use 12,000 J of energy, the power is

30 W

300 kW

30 kW

3 W

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The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be

0.5 W

1 W

2 W

5 W

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For 12 V and 40 mA, the power is

All of these

0.480 W

480,000 µW

480 mW

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A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is

42.85%

85.7%

4.28%

8.57%

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

2.1 Ah

0.58 Ah

58 Ah

21 Ah

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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?

2,000 h

200 h

10 h

1 h

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In 0.025 W, there are

2,500 µW

0.00025 mW

25 mW

25 kW

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

150 mW

4.8 W

480 mW

15 mW

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

7.68 mW

76.8 W

7.68 W

768 mW

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