ENERGY AND POWER QUIZ

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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A 3.3 k resistor dissipates 0.25 W. The current is

8.7 A

87 mA

8.7 µA

8.7 mA

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How many watt-hours represent 65 W used for 18 h?

1,170 Wh

11,700 Wh

11.7 Wh

117,000 Wh

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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

4.28%

42.85%

8.57%

85.7%

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How much continuous current can be drawn from a 60 Ah battery for 14 h?

4.28 A

428 A

42.8 A

4.2 A

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

22.6 mW

226 mW

13.2 mW

132 mW

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A 220 resistor dissipates 3 W. The voltage is

257 V

73.3 V

2.5 V

25.7 V

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

6 V

1.2 V

12 V

120 V

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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

neither resistor

330

both resistors

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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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