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4 Sep 2011 14:08:49 IST
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how to compare the emf of two given primary cells using potentiometer.
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5 Sep 2011 11:22:03 IST
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Using a potentiometer to compare EMFs relies on the 'driver cell' maintaining a constant pd acoss the wire throughout all the measurements - to maintain a constant potential gradient ('volts per metre') each time it is used for the comparison.to compare emf using potentiometer we intially plug in key 1 then key 2 is plugged in seperately , we get a balance point .. with lengths l1,l2 .. ratio of lengths corresponds to ratio of emf's
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