Energy Engineering Question:
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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%

Answer:

Option D

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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?

A. 20.16 kWh
B. 201.6 kWh
C. 2.01 kWh
D. 8.4 kWh
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