Question

how can a galvanometer be converted into voltmeter and ammmeter

Answer 1

Connect shunt in parallel to to galvanometer go get a ammeter

Connect a large resistance R in series with galvanometer to get voltmeter.

Resistance of shunt =current of galvanometer*resistance of galvanometer/total current-max current that can pass through galvanometer

Large resistance R( for voltmeter)= (potential difference/current of galvanometer) - resistance of galvanometer