The storage battery of a car has an emf of 12 V. If the internalresistance of the battery is 0.4 W, what is the maximum currentthat can be drawn from the battery?

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Solution

It is given that the storage battery of a car has an emf of 12V and the internal resistance of the battery is 0⋅4Ω

The formula for the emf of the battery is,

E=Ir

Substitute the value of E and r in the above equation.

12=I×0⋅4 I=30 A

Thus, the value of the maximum current that can be drawn from the battery is 30A.

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