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

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

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(i) In an open circuit, the emf of a cell and terminal voltage are same. 

(ii) In closed circuit, a current is drawn from the source, so, V = E –Ir, it is true/valid, because each cell has some finite resistance.

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