Electrical Engineering ⇒ Topic : A.C. Potentiometer
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Daniel
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A.C. Potentiometer An a.c. potentiometer basically works on the same principle as a d.c. potentiometer i.e., unknown e.m.f. and slide-wire voltage drop are made equal to obtain the balance. However, there is one important difference in the operation of the two. In a d.c. potentiometer, only the magnitudes of the unknown e.m.f. and slide-wire voltage drop are made equal to obtain the balance. But in an a.c. potentiometer, the magnitudes as well as phases of the two voltages are made equal for balance.Further, in an a.c. potentiometer, the frequency and waveform of slide-wire voltage must be the same as that of the voltage to be measured. This necessitates that the a.c. supply for the slide-wire must be taken from the same source as the voltage or current to be measured. These considerations suggest that for a.c. measurements, there should be some modifications in the potentiometer used for d.c. work. The practical field of use of a.c. potentiometer is in engineering measurements where an accuracy of 0.5% to 1% is acceptable | |
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