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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 Ohm, what is the maximum current that can be drawn from the battery?

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

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Given,

Emf of battery, E = 12 V

Internal Resistance of Battery, r = 0.4 $\Omega$

Let I be the maximum current drawn from the battery.

We know, According to Ohm's law:

E = Ir

I = E/r = 12/0.4

$\implies$I = 30 A

Hence the maximum current drawn from the battery is 30 A.

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