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A galvanometer may be converted into ammeter or voltmeter. In which of the following cases the resistance of the device will be the largest?

A galvanometer may be converted into ammeter or voltmeter. In which of the following cases the resistance of the device will be the largest? Correct Answer a voltmeter of range 10 V

Concept:

A galvanometer can be converted into an ammeter by connecting a low resistance in parallel.

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The effective resistance of device = Rsh in parallel with Rg

Where Rg is galvanometer resistance

A galvanometer can be converted into a voltmeter by connecting a high resistance in series.

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The effective resistance of device = Rse in series with Rg

Where Rg is galvanometer resistance

Application:

The voltmeter has high resistance and ammeter has low resistance.

Voltmeter with high full-scale range has high resistance.

So, a voltmeter of range 10 V has higher resistance.

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