A galvanometer is to be converted into a...

A galvanometer is to be converted into an ammeter or voltmeter. In which of the following cases the resistance of the device is largest?

A

an ammeter of range `10A`

B

a voltmeter of range `5V`

C

an ammeter of range `5A`

D

a voltmeter of range `10 V`

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The correct Answer is:

D

For conerversion in voltmeter `R=(V/(I_(g))-1)G`
For conversion in ammeter `S=G/((I/(I_(g))-1))`

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