define potentiometer?and which wire is used in potentiometer??
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A potentiometer is an instrument for measuring voltage by comparison of an unknown voltage with a known reference voltage. If a sensitive indicating instrument is used, very little current is drawn from the source of the unknown voltage. Since the reference voltage can be produced from an acccurately calibrated voltage divider, a potentiometer can provide high precision in measurement. The method was described by Johann Christian Poggendorff around 1841 and became a standard laboratory measuring technique. it is pentiometer
Deebandu:
and which wire is used??
Generally alloys like constantan ormanganin are used as potentiometer wire because they posses high specific resistance and low temperature coefficient.
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Answer:
The potentiometer is a simple device used to measure the electrical potentials (or compare the e.m.f of a cell). One form of potentiometer is a uniform high-resistance wire attached to an insulating support, marked with a linear measuring scale.
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