the Wheatstone bridge circuit, and giving rise to an output voltage proportional to the deformation. The ratio of the change in length to the gauge length is the average strain of the sample between ...

A Wheatstone bridge is one of those handy circuits that has plenty of uses in both AC and DC measurements. We probably see them most often in a strain gauge.

Either one, two or all four resistors can be strain gauges and the bridges are respectively called quarter-bridge, half-bridge or full-bridge Wheatstone bridge circuits. Pictured here are ...