Crompton potentiometer theory4/7/2023 ![]() ![]() Determination of the value of the unknown voltage now becomes a matter of evaluating the voltage drop ‘E’ along the slide wire. Zero galvanometer current or null, means that the unknown voltage E is equal to the voltage drop ‘E’ across portion xy of the slide wire. The method of measuring unknown voltage E depends on finding a position for the sliding contact such that the galvanometer shows zero deflection when galvanometer key K is closed. This working current through the slide wire may be varied by changing the rheostat setting. With function switch ‘s’ in the operate position and galvanometer key k open, the working battery supplies current through the rheostat and the slide wire. This principle of operation of all potentiometers is based on the following basic circuits. The basic principle here is measuring an unknown voltage by comparing it with known voltage. The known voltage may be supplied by a standard cell or any other known voltage-reference source. ![]() It is an instrument designed to measure an unknown voltage by comparing it with a known voltage. ![]()
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