A potentiometer is an accurate and versa...

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

cells

potential gradients

a condition of no current flow through the galvanometer

a combination of cells, galvanometer and resistances

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The correct Answer is:

When a cell is balanced against potential drop across a certain length of potentiometer wire , no current flows through the cell `therefore` emf of cell = potential drop across balacne length of potentiometer wire. So potentiometer is a more accurated device for measuring emf of a cell or no curent flows through the cell during measurement of emf.

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