ENERGY AND POWER QUIZ

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

2.1 Ah

21 Ah

58 Ah

0.58 Ah

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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

both resistors

33

330

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

4.8 W

150 mW

480 mW

15 mW

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A 3.3 k resistor dissipates 0.25 W. The current is

8.7 mA

8.7 A

8.7 µA

87 mA

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If you used 600 W of power for 60 h, you have used

1 kWh

10 kWh

36 kWh

3.6 kWh

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A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is

226 mW

13.2 mW

132 mW

22.6 mW

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A 15 V source is connected across a 12 resistor. How much energy is used in three minutes?

0.938 Wh

56.25 Wh

938 Wh

5.6 Wh

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For 12 V and 40 mA, the power is

480 mW

480,000 µW

0.480 W

All of these

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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%

8.57%

4.28%

85.7%

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