Practice portal › Current Electricity › Wheatstone Bridge, Metre Bridge and Potentiometer
Asked in GSEB Board July 2022 · Wheatstone bridge
Idea: a Wheatstone bridge is four resistances P, Q, R and S in a loop, with a galvanometer joining two opposite corners.
At balance no current flows through the galvanometer, and P/Q = R/S.
If three of the resistances are known, the fourth follows: S = (QR)/P.
So the bridge is used to determine an unknown resistance.
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