Explain the action of shunt?

Explanation

The shunt is a low resistance connected in parallel to a galvanometer to protect it from the strong currents in the circuit. The galvanometer shows full scale deflection with a very small current. If the whole of the strong current in an electric circuit passes through galvanometer, it may get damaged. The shunt allows only a small part of the current to flow through the galvanometer by acting as a by pass to the major part of the current.