International Library of Technology · Scranton, International Textbook Co. · leaf 151
esistance. Call y the resistance of the loopfrom B to F and x the resistance from D to F. With thebattery connected between A and D, as in the ordinarymethod of using the Wheatstone bridge, balance the bridge.This will give, by working out the unknown resistance inthe usual manner, a resistance R… … F Fig. 38. Now disconnect the battery from D and connect it to theground, as shown in Fig. 38. Then balance the bridge again,and the resistance x may be obtained by means of the follow-ing formula : nR— mp m -f- n (2.) in which m, 11, and p are the values of the resistances in thearms A B, A C, and…
Electrical engineering
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