Electrical Engineering - Energy and Power

Exercise :: Energy and Power - General Questions

6. 

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

Answer: Option C

Explanation:

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7. 

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

A. 938 Wh
B. 0.938 Wh
C. 56.25 Wh
D. 5.6 Wh

Answer: Option B

Explanation:

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8. 

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

A. 1.286 kWh
B. 12.85 kWh
C. 535 kWh
D. 252 kWh

Answer: Option A

Explanation:

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9. 

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

A. 4.8 W
B. 150 mW
C. 15 mW
D. 480 mW

Answer: Option B

Explanation:

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10. 

If you used 400 W of power for 30 h, you have used

A. 1.3 kWh
B. 13.3 kWh
C. 1.2 kWh
D. 12 kWh

Answer: Option D

Explanation:

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