# 28. A galvanometer coil has a resistance of   and the metre shows full scale deflection for a current of 4 mA. How will you convert the metre into an ammeter of range 0 to 6 A?

The galvanometer can be converted into an ammeter by connecting an appropriate resistor of resistance R in series with it.

At the full-scale deflection current(I) of 4 mA, the ammeter must measure a current of 6 A.

The resistance of the galvanometer coil is G =

Since the resistor and galvanometer coil are connected in parallel the potential difference is the same across them.

The galvanometer can be converted into an ammeter by connecting a resistor of resistance  in parallel with it.

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