Current Electricity Charging Discharging Of Capacitors Question 642
Question: 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
[CBSE PMT 2004]
Options:
A) 82.5%
B) 80 %
C) 90%
D) 87.5%
Show Answer
Answer:
Correct Answer: D
Solution:
Watt hour efficiency $ =\frac{\text{Discharging}\text{energy}}{\text{Charging}\text{energy}} $
$ =\frac{14\times 5\times 15}{15\times 8\times 10} $
$ =0.875 $
$ =87.5% $
BETA
