What are different types of Ammeter.

Hint: In the given question, we will discuss the types of Ammeter on the different basis. We will discuss the types of Ammeter on the basis of Construction and then also on the basis of measurement of current.

Complete step by step solution:
Types of ammeter depend on the construction and on the measurement of current, following are the classification:
Based on construction:
$ * $ Permanent moving coil ammeter: This ammeter is used for measuring direct current. Here the ammeter is placed between the pole of a permanent magnet. The deflection of the coil is dependent on the magnitude at which current flows.
$ * $ Moving iron ammeter: This is used for measuring both the currents alternating as well as direct current. The deflection of the coil is proportional to the current that passes through the coil.
$ * $ Electro-dynamometer ammeter: This instrument is again used for measuring both the currents. The accuracy of this instrument is high when compared to the other two instruments.
$ * $ Rectifier type ammeter: It is used for measuring alternating current and finds application in communication circuits.
Based on the measurement of current:
$ * $ AC ammeter
$ * $ DC ammeter

Note:
Ammeter means Ampere-meter which measures ampere value. Ampere is the unit of current so an ammeter is a meter or an instrument which measures current. The main principle of ammeter is that it must have a very low resistance and also inductive reactance.