Current Electricity Ques 69
69. A battery is charged at a potential of $15 V$ for 8 hours when the current flowing is $10 A$. The battery on discharge supplies a current of $5 A$ for 15 hours. The mean terminal voltage during discharge is $14 V$. The “watt-hour” efficiency of the battery is
[2004]
(a) $87.5 \%$
(b) $82.5 \%$
(c) $80 \%$
(d) $90 \%$
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Answer:
Correct Answer: 69.(a)
Solution:
- (a) Efficiency is given by $\eta=\frac{\text{ output }}{\text{ input }}$ $=\frac{5 \times 15 \times 14}{10 \times 8 \times 15}=0.875$ or $87.5 \%$
BETA
