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To determine the electromotive force of an accumulator, it is connected in series with a standard cell in a circuit. A current It of 0.2 A is then obtained. When the accumulator is connected to the same circuit with its e.m.f. opposing that of the standard cell, a current I2 of 0.08 A is obtained, the current entering the external circuit from the positive terminal of the accumulator. What is the electromotive force of the accumulator? The e.m.f. of the standard cell is 2 V.

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Answer:

Explanation:

If R is the total resistance of the circuit, ε1 the e.m.f. of the accumulator, ε2 the e.m.f. of the standard cell, then, in the first case, the current in the circuit is given by the equation

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