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Question

A storage battery is connected to a charger for charging with a voltage of 12.5 V. The internal resistance of the storage battery is 1Ω. When the charging current is 0.5 A, the emf of the storage battery ((in volt) is : (Give integer value)

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Solution

Given :
I=0.5 A , V=12 V , r=1Ω

Resistance of the charger, R=V1

R=12.50.5=25Ω
Now,
E=IR=(VR+r)R

E=(12.525+1)×(25)=0.18×25=12 V

Accepted answer : 12

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