Why Potentiometer is used in experiments?

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Gecko richtie

voltage difference.
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Gecko richtie

creating a potential difference or voltage.
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Science Tutor

Potentiometer is more accurate than voltmeter. as it reads EMF i*r. where r is internal resistance of potentiometer. and since it is closed loop system so it is more sensitive and higher stability.
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Trainer

Since it uses null deflection method it gives emf,where as any other device which draws current from it and measures its terminal pd only
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