it is said that Galvanometer can act as both ammeter and voltmeter. but voltmeter has more resistance and ammeter has low resistance. so how can a resistance of galvanometer change so much?

Dear Student ,
Look as the galvanometer is very sensitive instrument so we need to join a small resistance in parallel with the galvanometer which is known to be as the shunt resistance to convert the galvanometer in to an ammeter .

Now when an small resistance is connected in series with the galvanometer that is a shunt is in series with the galvanometer then the galvanometer is converted into the voltmeter .


Regards