The Moving Coil Galvanometer

An ammeter and a voltmeter of suitable ranges are to be used to measure the current and voltage of an electric lamp. If a mistake were made and the meters are interchanged what will happen? Explain.

A galvanometer of resistance $50 \Omega$ produces full-scale deflection for a current of $0.15 \mathrm{A}$. Determine the value of shunt required to make it an ammeter of range of $1.5 \mathrm{A}$ and  $5 \mathrm{A}$.

A $50 \mathrm{mV}$ voltmeter has a resistance of $5 \mathrm{ohm}$. A multiplier has been inserted to produce a voltmeter range of $3 \mathrm{volt}$ How can be multiplier be modified so that the new meter will have a range of $15 \mathrm{V}$.

A voltmeter always gives a lower value of Potential Difference. Why?

Find the expression for the resistance connected in parallel to convert a galvanometer to an ammeter.