How should you convert an ammeter to a voltmeter?

How should you convert a galvanometer into a voltmeter?

How shall you convert a galvanometer into an Ammeter

A galvanometer can be converted to an ammeter and a voltmeter by using respectively

A galvanometer coil has a resistance of 15 ohm and the meter shows full scale deflection for a current of 4 mA. How will you convert it to an ammeter of range 6A?

How will you convert ethanamine into methanamine?