The Wheatstone bridge is a very useful circuit. When the bridge is fully balanced, the right side resistors identical to the left side resistors (R1=R3, and R2=Rx), the voltage across the bridge is zero. However, with a small change in resistance on one of the resistors, and the bridge becomes unbalanced, and a voltage difference appears. Wheatstone bridge are used in all sorts of sensor devices such as strain gauges, pressure gauges, etc.
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