![]() At that point the galvanometer draws no current from the unknown source, and the magnitude of voltage can be calculated from the position of the sliding contact. ![]() The deflection of the galvanometer is observed and the sliding tap adjusted until the galvanometer no longer deflects from zero. The sliding contact or wiper of the potentiometer is adjusted and the galvanometer briefly connected between the sliding contact and the unknown voltage. In this arrangement, a fraction of a known voltage from a resistive slide wire is compared with an unknown voltage by means of a. The method was described by around 1841 and became a standard laboratory measuring technique. Since the reference voltage can be produced from an accurately calibrated, a potentiometer can provide high precision in measurement. Such a musician is Lisa Shaw and so is the treatment of this album Cherry. And fine, clear, soft-voiced, lady 'acid jazz' singers that caress the songs they sing. Her backing group, far from being part of what she has always done in the past, is both creative and well crafted to fit into every detail of her beautiful new style. If a sensitive indicating instrument is used, very little current is drawn from the source of the unknown voltage. A potentiometer is an instrument for measuring voltage by comparison of an unknown voltage with a known reference voltage. This article is about the measuring instrument.
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