potentiometer that use for measuring an electromotive force by balancing it against the potential difference produced by passing a known current through a known variable resistance, potentsiaalimõõtur, mida kasutatakse elektromotoorjõu mõõtmiseks, tasakaalustades seda potentsiaalide erinevusega, mis tekib teadaoleva voolu läbimisel teadaoleva muutuva takistuse kaudu