the following text is given in the ncert book,'emf is the potential difference between the positive and negative electrodes in an open circuit when no current passes through the cell'.But,according to ohms law , V is directly proportional to I so in this case when there is no current there shouldn't be any potential difference? and also W=qE where E is the electric field but here it is given as emf. please explain?

Asked by bvignesh | 30th Jul, 2011, 12:00: AM

Expert Answer:

EMF is the electromotive force of the cell; its value depends on the electrolyte used in the cell and the materials of the electrodes not on the current flowing through the circuit.

Answered by  | 11th Aug, 2011, 11:01: PM

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