Measurement Of Resistance By Wheatstone Bridge. It is used to detect the null or balanced condition. The figure below shows the circuit diagram for resistance measurement of an unknown.
A wheatstone bridge is an electrical circuit used to measure an unknown electrical resistance by balancing two legs of a bridge circuit, one leg of which includes the unknown component.the primary benefit of the circuit is its ability to provide extremely accurate measurements (in contrast with something like a simple voltage divider). A wheatstone bridge has been in use longer than almost, any electrical measuring instrumen t. Variations on the wheatstone bridge can be used to measure capacitance, inductance, impedance and other quantities, such as the amount.