The meter bridge is an instrument that is used to find the unknown resistance of a coil or any other material. This bridge works under the principle of the Wheatstone Bridge. We know that the Wheatstone bridge is used to measure the unknown resistance connected in a circuit. It consists of four resistors of which two resistors are known Resistors, a variable resistance and an unknown resistance. It also consists of a galvanometer. The bridge has two series-parallel arrangements of resistors. The figure of the Wheatstone bridge is shown below: