When no external circuit is connected

PHYSICS · Subjective · A Level · Physics · Electricity · Electricity

Problem

When no external circuit is connected, a battery’s potential difference is measured to be 9.0 V. When a 3.0 Ω resistor is connected across its terminals, the potential difference drops to 8.1 V. Determine the internal resistance of the battery.

Related theory

Cells & EMF
Compound Circuits
EMF and internal resistance
Current Electricity
EMF, internal resistance and terminal voltage
Cells emf and internal resistance
Electricity

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