Resistance of galvanometer is normally measured using post office box
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A post office box can also be used to measure an unknown resistance. This three hand is a Whathstown Bridge with P, Q and R. The fourth hand is an unknown resistance. If P and Q are known as ratios, R is known as rheostat arm.
Balance, unknown resistance
S = (P / Q) R ...... (1)
The ratio hands first are adjusted so that they carry every 100 W. The resistance in the rheostat arm has been adjusted so that the deviation of the galvanometer may be in one direction. If r = r .
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