Define potentiometer
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A potentiometer is a three-terminalresistor with a sliding or rotating contact that forms an adjustable voltage divider.[1] If only two terminals are used, one end and the wiper, it acts as a variable resistor or rheostat.USED FOR MEASURING VOLTAGE
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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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