# The Wheatstone Bridge

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A Wheatstone bridge is an instrument that measures an unknown electrical resistance. This is accomplished by balancing the two legs of the circuit, with one of them containing the unknown resistor . When the bridge is perfectly balanced, the voltage across the galvanometer is zero and therefore no current flows between the midpoints. This Demonstration allows you to visualize the Wheatstone bridge circuit and to determine the unknown resistance by changing the resistance of variable resistor .

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Contributed by: Ernest Lee (March 2011)

Open content licensed under CC BY-NC-SA

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