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Current Electricity

Question

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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?

Solution

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

Given,
E.m.f of the battery,

ε = 12 V

Internal resistamce of the battery,

r = 0.4

Therefore, using the formula for maximum current drawn we get,

I_{\max} = \frac{ε}{r} = \frac{12}{0.4} = 30 A

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