Question

He emf of a cell always greater than its terminal voltage. Why? Give reason.

Answer 1

QUESTION;

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Why is the EMF of a cell always greater than its terminal voltage?

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REASON;

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When the cell is open circuit, or if you connect

a high impedance voltmeter to the terminals of

the cell, then the terminal voltage will be equal

to the EMF.

When you draw current from the cell, that current

has to flow through the internal resistance of that

cell. It is that resistance that causes a voltage drop

that is subtracted from the EMF to yield the

terminal voltage.

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