ENERGY AND POWER QUIZ

A certain appliance uses 350 W. If it is allowed to run continuously for 24 days, how many kilowatt-hours of energy does it consume?

8.4 kWh

2.01 kWh

201.6 kWh

20.16 kWh

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

30 W

3 W

30 kW

300 kW

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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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At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?

12.85 kWh

535 kWh

1.286 kWh

252 kWh

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

5.6 Wh

56.25 Wh

938 Wh

0.938 Wh

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A 220 resistor dissipates 3 W. The voltage is

73.3 V

2.5 V

257 V

25.7 V

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

150 mW

15 mW

4.8 W

480 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

neither resistor

both resistors

330

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In 40 kW, there are

0.4 mW

40,000 W

400 W

5,000 W

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

132 mW

13.2 mW

22.6 mW

226 mW

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