A) 82.5%
B) 80%
C) 90%
D) 87.5%
Correct Answer: D
Solution :
[d] 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 |
\[=Vit\] |
\[=15\times 10\times 8=1200\,W.\,h\] |
Energy released when the battery is discharged |
\[=14\times 5\times l5=1050W-h\] |
Hence, W-h efficiency of battery is given by |
\[\text{=}\frac{\text{energy}\,\text{output}}{\text{energy}\,\text{input}}\text{=}\frac{\text{1050}}{\text{1200}}\] |
\[=0.875=87.5%\] |
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