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Calculate emf and internal resistance of a battery

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Part 1:

A battery has an emf E and an internal resistance r. When the battery is connected to a 28.0 W resistor, the current through the battery is 0.604 A. When the battery is connected to a 53.1 W resistor, the current is 0.499 A. Calculate the emf of the battery (in V).

Part 2:

Calculate its internal resistance (in ohm).

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Solution Summary

In this exercise, students are asked to calculate the emf and the internal resistance of a battery, when the battery is connected to a resistor in series.

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