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

Options

A. `87.5 %`
B. `82.5 %`
C. `80%`
D. `90%`

Answer

A

Explanation

Efficiency is given by `eta = ("output")/("input")`
`=(5 xx 15 xx 14)/(10 xx 8 xx 15)=0.875` or `87.5%`