Galvanometer,Galvanometer as a Voltmeter,Wheatstone Bridge ,Potentiometer,

Galvanometer

•The galvanometer is the "classic" device to measure current

•Based on the fact that a wire carrying current in a magnetic field feels a force

•The current flows through a coil in a magnetic field

•The coil experiences a torque proportional to current

•The movement of the coil is "opposed" by a spring

•The deflection of the needle is proportional to current

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