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Question
Under what condition is the e.m.f. of a cell equal to its terminal voltage ?
Under what condition is the e.m.f. of a cell equal to its terminal voltage ?
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Solution
The correct option is B no current drawn from cell
The potential difference between the terminals of a battery will equal the emf of the battery when there is no current in the battery. At this time, the potential drop across the internal resistance is zero. This only happens when there is no load placed on the batterythat includes measuring the potential difference with a voltmeter. The terminal voltage will exceed the emf of the battery when current is driven backward through the battery, in at its positive terminal and out at its negative terminal.
The potential difference between the terminals of a battery will equal the emf of the battery when there is no current in the battery. At this time, the potential drop across the internal resistance is zero. This only happens when there is no load placed on the batterythat includes measuring the potential difference with a voltmeter. The terminal voltage will exceed the emf of the battery when current is driven backward through the battery, in at its positive terminal and out at its negative terminal.
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