ENERGY AND POWER QUIZ

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

3 W

30 kW

300 kW

30 W

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

7.68 W

76.8 W

768 mW

7.68 mW

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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?

33

330

both resistors

neither resistor

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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

8.57%

42.85%

85.7%

4.28%

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Three hundred joules of energy are consumed in 15 s. The power is

2 W

20 W

200 W

2,000 W

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

0.58 Ah

21 Ah

58 Ah

2.1 Ah

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

1.2 V

12 V

120 V

6 V

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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

1 h

200 h

10 h

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A 3.3 k resistor dissipates 0.25 W. The current is

8.7 A

8.7 µA

8.7 mA

87 mA

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

56.25 Wh

5.6 Wh

938 Wh

0.938 Wh

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