A battery is charged at a potential of $15 \mathrm{~V}$ for 8 hours when the current flowing is $10 \mathrm{~A}$. The battery on discharge supplies a current of $5 \mathrm{~A}$ for 15 hour. The mean terminal voltage during discharge is 14V. The "Watt-hour" efficiency of the battery is

Question

A battery is charged at a potential of $15 \mathrm{~V}$ for 8 hours when the current flowing is $10 \mathrm{~A}$. The battery on discharge supplies a current of $5 \mathrm{~A}$ for 15 hour. The mean terminal voltage during discharge is 14V. The "Watt-hour" efficiency of the battery is, $87.5 \%$, $82.5 \%$, $80 \%$, $90 \%$

MARKS App · Accepted Answer

Efficiency is given by $\eta=\frac{\text { output }}{\text { input }}$ $=\frac{5 \times 15 \times 14}{10 \times 8 \times 15}=0.875 \text { or } 87.5 \%$

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