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Energy and Power MCQs
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Avg score: 36% • Most missed: “At the end of a 14 day period, your utility bill shows that you have used 18 kWh…”
Energy and Power MCQs
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25 Questions

1. A resistor normally opens when it burns out.
2. A half-watt is equal to how many milliwatts?
3. At the end of a 14 day period, your utility bill shows that you have used 18 kWh. What is your average daily power?
4. A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is
5. A 75 Ω load uses 2 W of power. The output voltage of the power supply is approximately
6. A 15 V source is connected across a 12 Ω resistor. How much energy is used in three minutes?
7. The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be
8. A 68 Ω resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is
9. The power rating of a resistor determines the minimum power that it can handle safely.
10. 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?
11. If you used 400 W of power for 30 h, you have used
12. In 40 kW, there are
13. When the current through a 12 kΩ resistor is 8 mA, the power is
14. Energy equals power multiplied by time.
15. If you used 600 W of power for 60 h, you have used
16. When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is
17. A 3.3 kΩ resistor dissipates 0.25 W. The current is
18. A battery is one type of power supply that converts chemical energy into electrical energy.
19. A 6 V battery is connected to a 300 Ω load. Under these conditions, it is rated at 40 Ah. How long can it supply current to the load?
20. The joule is a unit of energy.
21. How many watt-hours represent 65 W used for 18 h?
22. Three hundred joules of energy are consumed in 15 s. The power is
23. A 120 Ω resistor must carry a maximum current of 25 mA. Its rating should be at least
24. Energy is equal to power multiplied by voltage.
25. If it takes 400 ms to use 12,000 J of energy, the power is

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