How does a moving coil galvanometer work, and how is it converted into an ammeter or voltmeter?
How does a moving coil galvanometer work, and how is it converted into an ammeter or voltmeter?
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1 Answer
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The principle that a current-carrying coil placed in a magnetic field feels a torque is behind a moving coil galvanometer. The coil rotates due to this torque, and the angle of deflection is proportional to the current. For the conversion of a galvanometer into an ammeter, a high current is allowed to bypass the Galvanometer by connecting a low resistance (shunt) in parallel. A high resistance is connected in series to restrict current and convert it into a voltmeter. The conversions make the galvanometer ideal for measuring higher ranges of voltage and current in practical circuits.
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