A battery of e.m.f. E and internal resistance r is connecte…

Physics Current Electricity Kirchhoff's Law, EMF of The Cells, Internal Resistance Single Correct MCQ

Published on: September 12, 2026

A battery of e.m.f. E and internal resistance r is connected to a variable resistor R as shown here. Which one of the following is true

Potential difference across the terminals of the battery is maximum when R = r

Power delivered to the resistor is maximum when R = r

Current in the circuit is maximum when R = r

Current in the circuit is maximum when $R > > r$

Text Solution

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The correct answer is:

For power to be maximum

External resistance = Equivalent internal resistance of the circuit

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