In Fig. 27-61, Rs is to be adjusted in value by moving the
Chapter , Problem 55(choose chapter or problem)
In Fig. 27-61, Rs is to be adjusted in value by moving the sliding contact across it until points a and b are brought to the same potential. (One tests for this condition by momentarily connecting a sensitive ammeter between a and b; if these points are at the same potential, the ammeter will not deflect.) Show that when this adjustment is made, the following relation holds: Rx ! RsR2/R1. An unknown resistance (Rx) can be measured in terms of a standard (Rs) using this device, which is called a Wheatstone bridge.+ R0baRs RxR1 R2Sliding contact Figure 27-61 55.
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