ENERGY AND POWER QUIZ

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%

TRUE ANSWER : ?
YOUR ANSWER : ?

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

58 Ah

21 Ah

0.58 Ah

2.1 Ah

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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

938 Wh

56.25 Wh

5.6 Wh

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

30 kW

30 W

300 kW

3 W

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A 3.3 k resistor dissipates 0.25 W. The current is

87 mA

8.7 A

8.7 mA

8.7 µA

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

117,000 Wh

1,170 Wh

11.7 Wh

11,700 Wh

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

3.6 kWh

36 kWh

10 kWh

1 kWh

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

2,000 W

200 W

20 W

2 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?

20.16 kWh

2.01 kWh

8.4 kWh

201.6 kWh

TRUE ANSWER : ?
YOUR ANSWER : ?

In 40 kW, there are

0.4 mW

40,000 W

5,000 W

400 W

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