Topic: Internal resistance, emf, cells in series and parallel· Current Electricity

A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves :

1. potential gradients

2. a condition of no current flow through the galvanometer

3. a combination of cells, galvanometer and resistances

4. cells

Doubtly Asked 30 Oct 2026 NEET UG 2017 neet Save WhatsApp Report

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Answer: 2. a condition of no current flow through the galvanometer

Key idea: at the balance point no current flows through the galvanometer, so the cell is not loaded and its internal resistance does not cause a voltage drop.

That is why the potentiometer measures the true emf accurately. Potential gradient and cells are only part of the set-up, not the reason for accuracy.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report

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A potentiometer is an accurate and versatile device to make electrical measurements of E.M.F. because the method involves :

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