what is the principle of a moving galvanometer ? How it can be converted into an ammeter ?
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The principle of moving galvanometer is based upon the fact that when electric current flows in a coil placed in a magnetic field, a deflecting torque acts upon the coil whose magnitude depends upon the strength of the current.
A galvanometer can be converted into an ammeter by connecting a low resistance in parallel to galvanometer value.
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A galvanometer can be converted into an ammeter by connecting a low resistance (called shunt) in parallel to galvanometer value of shunt is so adjusted that most of the current passes through the shunt. In this way a galvanometer is converted into ammeter and can measure heavy currents without fully deflected.
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