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NEET2004PhysicsCurrent ElectricityActual

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:

Options

  1. A82.5 %
  2. B80 %
  3. C90 %
  4. D87.5 %

Correct answer

D. 87.5 %

Step-by-step solution

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 . gathered Efficiency of battery = 1050 1200 100 =87.5 % gathered

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