wheatstone Bridge principle
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A Wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of abridge circuit, one leg of which includes the unknown component. ... The Wheatstone bridge was invented by Samuel Hunter Christie in 1833 and improved and popularized by Sir Charles Wheatstone in 1843.
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It is a bridge in which four resistances are arranged with a cell and a galvanometer.In the balanced situation of bridge,P/Q=R/S.The potential difference between the points A and B is zero and no current flows through the galvanometer.
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