First slide

Cell

Question

A storage battery is connected to a charger for charging with a voltage of 12.5 volts. The internal resistance of the storage battery is $1 Ω$ When the charging current is 0.5 A, the emf of the storage battery is

Moderate

A

13 volts
B

12.5 volts
C

12 volts
D

11.5 volts

Solution

$V = ε + i (r) \Rightarrow 12 .5 = ε + \frac{1}{2} (1) \Rightarrow ε = 12 V$
(As the battery is a storage battery it is getting charged)

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