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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80%

90%

87.5%

82.5%

answer is C.

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Detailed Solution

% Watt hour efficiency = EoutEin x 100=1451515108 x 100=87.5%

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