Energy Engineering Question:
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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


Option B

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In 0.025 W, there are

A. 25 kW
B. 0.00025 mW
C. 2,500 µW
D. 25 mW
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%