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Shunt in Galvanometer

A shunt is a resistance which is used in electric circuits to divert or to limit the current.  A galvanometer measures the current passing through it. 

If the shunt is used in series with the galvanometer, the galvanometer can be used to measure voltage.  If the shunt is used in parallel with the galvanometer, the galvanometer can be used to measure current and works as an ammeter.

 

Shunt in Galvanometer