Current Electricity - Result Question 56
59. 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
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======= ####59. 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
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $87.5 %$
(b) $82.5 %$
(c) $80 %$
(d) $90 %$
[2004]
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Answer:
Correct Answer: 59. (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 $87.5 %$
