A galvanometer coil has a resistance of 12 Ω and the metre shows full scale deflection for a current of 3 mA. How will you convert the metre into a voltmeter of range 0 to 18 V?
Converting galvanometer into voltmeter is done by adding resistance in series. The resistance is given by R=IgV−G; G is resiatance of galvanometer. ⇒R=5988Ω
