In moving iron type ammeter the coils has
Right Answer is:
Few turns of thick wire
In moving iron type ammeter the coils have Few turns of thick wire
Moving iron instruments are of two types: attraction type and repulsion type. In both types, the principle of operation is the force experienced by an iron piece in the presence of a magnetic field. The necessary magnetic field is produced by the ampere-turns of a current-carrying coil. When used as an ammeter the coil has fewer turns of thick wire so that the ammeter has low resistance.
When used as a voltmeter, the coil has a high impedance so as to draw a small current as possible since it is connected in parallel. Since the current through it would be small, it has to have a large number of turns to produce the necessary ampere-turns.