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A battery is charged at a potentail of 1...

A battery is charged at a potentail of `15 V` for 8 hours when the current flowing is `10 A` for 15 hours. Then mean terminal voltage during discharge is `14 V`. The Watt-hour efficiency of the battery is

A

`82.5 %`

B

`80%`

C

`90%`

D

`87.5%`

Text Solution

Verified by Experts

The correct Answer is:
D
(d) Watt hour efficiency `= ("Discharging energy")/("Charging energy")`
`= (14 xx 5 xx 15)/(15 xx 8 xx 10) = 0.875 = 87.5%`
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