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Question

The storage battery of a car has an emf of 12 V. If the internal resistance of the battery is 0.4 Ω, what is the maximum current that can be drawn from the battery ?

A
30 A
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B
10 A
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C
20 A
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D
40 A
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Solution

The correct option is A 30 A
Given:
EMF, E=12 V;
Internal resistance, r=0.4 Ω

The maximum current is drawn from the battery when the external resistance in the circuit is zero, i.e., R=0.

Thus, Imax = Er = 120.4 = 30 A

So, option (c) is right.
Why is question ?
The maximum current is drawn from the battery when the external resistance in the circuit is zero.

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