A Wheatstone bridge circuit consists of four arms, of which two arms consist of known resistances while the other two arms consist of an unknown resistance and a variable resistance.
The circuit also consists of a galvanometer and an electromotive force source.
The Wheatstone bridge is used for the precise measurement of low resistance.
Wheatstone bridge and an operational amplifier are used to measure physical parameters such as temperature, light, and strain.
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