What is an Ammeter?

What is an Ammeter?

Ammeter Definition

An ammeter is defined as a device that measures the electric current in a circuit in amperes.

Working Principle of Ammeter

Ammeters must have low resistance and inductive reactance to minimize voltage drop and power loss, and they are connected in series to measure current accurately.

Classification or Types of Ammeter

• Permanent Magnet Moving Coil(PMMC) ammeter.

• Moving Iron (MI) Ammeter.

• Electrodynamometer type Ammeter.

• Rectifier type Ammeter.

Permanent Magnet Moving Coil (PMMC) Ammeter

This type of ammeter uses permanent magnets and is best for measuring DC currents due to its high accuracy and linear scale.

Moving Iron (MI) Ammeter

MI ammeters can measure both AC and DC currents using the magnetic attraction or repulsion principle, making them versatile for different types of current.

Electrodynamometer Type Ammeter

These ammeters can measure both AC and DC without recalibration, using fixed and moving coils to produce unidirectional torque.