Question

Why can't we measure emf of a cell using voltmeter?

Answer 1

EMF of a cell is it's overall Electro Motive Force encapsulated in it.

It is net power residing in the cell or the battery.

A voltmeter needs some power for itself to consume for measuring the emf if the cell and hence it will always indicate less emf .

It will convert the emf into the terminal potential difference of the cell which is not always equal to the emf.

Hence, as the voltmeter itself draws some power so it can't be used for measuring the emf of the cell.

Answer 2

☆$\red {HELLO\:DEAR}$☆

1. EMF of a cell is it's overall Electro Motive Force encapsulated in it.
2. It will convert the emf into the terminal potential difference of the cell which is not always equal to the emf.
3. Hence, as the voltmeter itself draws some power so it can't be used for measuring the emf of the cell.

☆$\green {VISHU\:PANDAT}$☆

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