A) 82.5%
B) 80%
C) 90%
D) 87.5%
Correct Answer: D
Solution :
Key Idea: Watt-hour efficiency of a battery is the ratio of output energy to the input energy. Input energy when the battery is charged \[=Vit\] \[=15\times 10\times 8=1200\text{ }W-h\] Energy released when the battery is discharged \[=14\times 5\times 15=1050\text{ }W-h\] Hence, W-h efficiency of battery is given by \[=\frac{energy\text{ }output}{energy\text{ }input}=\frac{1050}{1200}\] \[=0.875=87.5%\]You need to login to perform this action.
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