- A. 1 h
- B. 200 h
- C. 2,000 h
- D. 10 h
Energy and Power
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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?
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When the pointer of an analog ohmmeter reads close to zero, the resistor being measured is_____.
- A. Overheated
- B. Shorted
- C. Open
- D. Reversed
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A given power supply is capable of providing 6 A for 3.5 h. Its ampere-hour rating is_____.
- A. 0.58 Ah
- B. 2.1 Ah
- C. 21 Ah
- D. 58 Ah
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Watt’s law states the relationships of power to energy.
- A. True
- B. False
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The watt is the unit of power.
- A. True
- B. False
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In 0.025 W, there are_____.
- A. 25 kW
- B. 0.00025 mW
- C. 2,500 µW
- D. 25 mW
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The capacity of a battery is measured in milli-amperes.
- A. True
- B. False
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A 220 Ω resistor dissipates 3 W. The voltage is_____.
- A. 73.3 V
- B. 2.5 V
- C. 25.7 V
- D. 257 V
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The power rating of a carbon-composition resistor that is to handle up to 1.2 W should be_____.
- A. 2 W
- B. 1 W
- C. 5 W
- D. 0.5 W
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A 3.3 kΩ resistor dissipates 0.25 W. The current is_____.
- A. 8.7 mA
- B. 87 mA
- C. 8.7 µA
- D. 8.7 A