First slide

Electrical power

Question

A cell of emf 10 V and internal resistance 0.5 Ω is being changed by 2A current as shown in figure. Then chemical energy is stored in the cell at the rate of

Moderate

A

18 W
B

9 W
C

16 W
D

20 W

Solution

Potential difference between the terminals of the cell, V = (10 - 2 x 0.5) volt = 9 volt.
$∴$ Rate at which chemical energy is stored = Vi = 9 x 2 W= 18 W.

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