1.

48.A battery is charged at a potential of 15V for 8hours when the current flowing is 10A. Thebattery on discharge supplies a current of 5Afor 15 hours. The mean terminal voltage duringdischarge is 14V. The "watt-hour" efficiency ofthe battery is a) 87.5%(b) 82.5%(d) 90%(c)80%

Answer»

Watt - hour efficiency of a battery is the ratio of the amount of energy available during the discharge of a battery to the amount of energy put in during charge.

Electrical energy = Voltage x Power x time

Energy available during discharge = VIt = 14 x 5 x 15 = 1050 kWh

Energy put in during charge = VIt = 15 x 10 x 8 = 1200 kWh

Watt - hour efficiency = (1050/1200)x100% = 87.5%

Ans. (d) 87.5%.



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