ENERGY AND POWER QUIZ

When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is

overheated

shorted

reversed

open

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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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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

neither resistor

both resistors

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In 40 kW, there are

40,000 W

0.4 mW

400 W

5,000 W

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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

201.6 kWh

2.01 kWh

20.16 kWh

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A half-watt is equal to how many milliwatts?

5,000 mW

50 mW

5 mW

500 mW

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A 220 resistor dissipates 3 W. The voltage is

73.3 V

25.7 V

2.5 V

257 V

TRUE ANSWER : ?
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If you used 400 W of power for 30 h, you have used

12 kWh

13.3 kWh

1.2 kWh

1.3 kWh

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

30 kW

300 kW

3 W

30 W

TRUE ANSWER : ?
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A 3.3 k resistor dissipates 0.25 W. The current is

87 mA

8.7 µA

8.7 A

8.7 mA

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