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whn we convert galvanometer to ammeter we add a shunt to it. d shunt lowers the resistance of the circuit. again as d shunt resistance is very low as compared to that of d galvanometer, only a fraction of current passes thru d galvanometer. so, my doubt is that- since only a little amount of current is passed thru galvanometer, then how do we obtain the correct reading of current??? (consider the case of moving coil galvanometer). plz explain using formulae...... rates assured.....


whn we convert galvanometer to ammeter we add a shunt to it. d shunt lowers the resistance of the circuit. again as d shunt resistance is very low as compared to that of d galvanometer, only a fraction of current passes thru d galvanometer.


 so, my doubt is that- since only a little amount of current is passed thru galvanometer, then how do we obtain the correct reading of current??? (consider the case of moving coil galvanometer).


 plz explain using formulae......


 rates assured.....


Grade:10

1 Answers

ROSHAN MUJEEB
askIITians Faculty 829 Points
one year ago

A galvanometer is a very sensitive instrument and only a very small amount of current is needed to cause full scale deflection. So for current measurement purposes, it is desirable to pass the majority of the current through another path while allowing only a small fraction to flow through the galvanometer so that it is not damaged. This is achieved by connecting a very low resistance in parallel with the galvanometer coil.

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