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A battery is charged at a potential fo 1...

A battery is charged at a potential fo 15 V for 8 h when the current folwing is 10A. The battery on discharge supplies a current of 5A fo 15h . The mean terminal voltage during discharge is 14V. The watt-hour efficiency of the battery is

A

`80%`

B

`90%`

C

`85%`

D

`95%`

Text Solution

Verified by Experts

The correct Answer is:
C
When charge
Energy `= 15 xx 10 xx 8` Wh
When discharge
Energy `= 14 xx 5 15` Wh
Energy `=14 xx 5 xx 15` Wh
`eta = (14 xx 5 15)/(15 xx 10 xx 8) = 7/8 = 87.5%`
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