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It is an circuit that is used to find the value of the resistances. The main principle behind it is the balancing an circuit by means of varying an resistance on connected to an arm of the circuit.When the resistance become equal to the variable resistance no current flows thus we can find the value of the resistance.
The correct term is the 'Wheatstone Bridge' or 'Wheatstone's Bridge', named in honour of its inventor.
It is one example of numerous other 'bridge circuits'. Wheatstone's Bridge is used to accurately measure values of resistance. I suggest that you check out WikiAnswer to see its circuit diagram, and explanation of how it is used.
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