Potentiometer Method For Measurement Of Resistance
The dc potentiometer may be used for measuring resistances of very low value, such as instrument shunts. This is really a laboratory or test room method, and is based on the comparison of one resistance against another by an indirect method. The voltage drop across both the unknown resistor and standard resistor R are measured by a dc potentiometer. The ratio of two potentiometer readings gives the ratio of X to S Mathematically.
X/S=(Potentiometer reading across X)/(Potentiometer reading across S )=Vx/Vs
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