A battery is charged at a potential of 15V for 8H when the current flowing is 10A. The battery on discharge supplies a current of 5A for 15H. The mean terminal voltage during discharge is 14V. The "watt-hour" efficiency of the battery is:
Text Solution
Verified by ExpertsThe correct answer is:
D
Watt-hour efficiency of a battery is the ratio of output energy to the input energy. Input energy when the battery is charged
= Vit
= 15 × 10 × 8 = 1200 W–h
Energy released when the battery is discharged
= 14 × 5 × 15 = 1050 W–h
Hence, W-h efficiency of battery is given by
= 
= 
= 0.875 = 87.5%
Prepare Smarter with CGP Edu
Get practice questions, solutions, and test series in one place.
Write a Review
Share your experience with this question and solution.
Commentary
Send your comment, doubt, correction, or feedback to admin.
Similar Questions
Explore conceptually related problems
In an electric circuit containing a battery, the positive charge inside the battery
In which of the above cells, the potential difference between the terminals of a cell exceeds its e…
The efficiency of a cell when connected to a resistance R is 60%. What will be its efficiency if th…
Two bulbs 25W, 220V and 100W, 220V are given. Which has higher resistance?
The resistors whose ratio is 1 : 2, are connected in parallel, the ratio of power dissipated is :
Find the current flowing through the resistance R 1 of the circuit shown in figure if the resistanc…