# Electrical Engineering - Energy and Power

### Exercise :: Energy and Power - General Questions

21.

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

Explanation:

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22.

How much continuous current can be drawn from a 60 Ah battery for 14 h?

 A. 42.8 A B. 428 A C. 4.28 A D. 4.2 A

Explanation:

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23.

A 75 load uses 2 W of power. The output voltage of the power supply is approximately

 A. 120 V B. 1.2 V C. 12 V D. 6 V

Explanation:

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24.

When the current through a 12 k resistor is 8 mA, the power is

 A. 7.68 mW B. 768 mW C. 7.68 W D. 76.8 W

Explanation:

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25.

A 68 resistor is connected across the terminals of a 3 V battery. The power dissipation of the resistor is

 A. 132 mW B. 13.2 mW C. 22.6 mW D. 226 mW