Question

A galvanometer mat be converted into ammeter and voltmeter. In which of the following cases the resistance of the device will be the largest? $($Assume maximum range of galvanometer $=1mA)$

• A. an ammeter of range 10A
• B. a voltmeter of range 5 V
• C. an ammeter of range 5 A
• D. a voltmeter of range 10 V

Answer 1

The correct option is D a voltmeter of range 10 V

We know that for converting galvanometer to ammeter need a small shunt (resistance) in parallel and need a large resistance in series for converting to voltmeter.
Since $V=IR$, so the voltmeter of range 10 V will have largest resistance.