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 i

Question

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:NEET 2004

TestHub · Accepted Answer

When the battery is charged then Watt hour = V I t = 15 × 10 × 8 = 1200 W/hr. During discharge the watt hour u = 1050 W / hr . ∴ Efficiency of battery = 1200 1050 ​ × 100 = 87.5% ​

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