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An **ammeter** is a device measuring the value of an **electric current** in a unit called **Ampere (A)**. An ammeter must have a very low resistance.
It is connected in series in an electric circuit, so all the current will flow through the ammeter. We know many types of ammeters and they can be sorted by the constructing principle.
This model represents an **analog ammeter** with a permanent magnet and a moving coil. It uses **magnetic deflection**. ***An electric current passing through the coil placed in the magnetic field of a permanent magnet causes the coil to move***. The modern form of this instrument uses two spiral springs to provide the restoring force. The uniform air gap between the iron core and the permanent magnet poles make the deflection of the meter **linearly proportional to the current**. These meters have **linear scales**.
