Question

QHow can we convert a galvanometer into an ammeter, What should be the value
of resistance used.
A voltmeter has a resistance G and range V. Calculate the resistance to be used in series with it to extend its range to nV
series with it to extend its range to nV.
[3]

Answer 1

A galvanometer can be converted into ammeter by connecting a low resistance called shunt in parallel to the galvanometer. Let G be the resistance of the galvanometer, I be the maximum current to be measured by the ammeter, and Ig be the maximum current that can be passed through the galvanometer.

o find: value of resistance in ohm connected in series with it: Solution: ... V = IR. The voltage for galavonometer is nV. The voltage for voltmeter is (n-1)V. Thus ...

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