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Galvanometer
This equipment is use to detect the current passed through a coil.When a current is passed through a coil the coil experiences a torque proportional to the current. When the coil's movement is opposed by a coil spring the amount of deflection of a needle attached to the coil is proportional to the current passing through the coil.In more sensitive galvanometers the arrow(needle head) is replaced with a mirror reflectinga beam of light onto a distant scale for  a smooth meter reading.

Structure(schematics) of a Galvanometer 
  • Galvanometer as a Ammeter

Rs :-Shunt resistance






  • Galvanometer as a Voltmeter










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