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Electric Current - Internal Resistance of the Battery

1. A battery with 12-V emf has a terminal voltage of 11.4 V. When it delivers a delivers a current of 20 A to the starter of a car. What is the internal resistance r of the battery?

A) how much emf is delivered but the battery above when it delivers a current of 20 A? (b) how much of this power is delivered to the starter? (c) by how much does the chemical energy of the battery decrease when it delivers a current of 20 A to the starter for 3 min? (d) how much heat is developed in the battery when it delivers a current of 20 A for 3 min?

Solution Preview

12 - Vr = 11.4 => Vr=0.6 V Vr is the voltage drop across the internal resistor

R = ...

Solution Summary

This solution calculates internal resistance of a battery and the emf delivered when it delivers a given current.

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