Energy Engineering Question:
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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

Option C

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A power supply produces a 0.6 W output with an input of 0.7 W. Its percentage of efficiency is A. 8.57% B. 42.85% C. 4.28% D. 85.7%	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