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

Given,

Emf of battery, E = 12 V

Internal Resistance of Battery, r = 0.4

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

I = 30 A

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

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