define or discribe a potentiometer.
ans - A potentiometer is a device which does not any current from ckt. acting like an ideal voltmeter and measure potential difference accurately used to measure potential difference accurately and like ideal voltmeter it does not damage any current from ckt.
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A potentiometer is an instrument for measuring an electromotive force by balancing it against the potential difference produced by passing a known current through a known variable resistance.
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yours is also correct
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