Transformers

A transformer is a device that changes AC electric power at one voltage to AC electric power at another voltage level through the action of a magnetic field.It consists of two or more coils of wire wrapped around a common ferromagnetic core.These coils are usually not directly connected.The only connections between the coils is the magnetic flux present within the core.

One of the transformer windings is connected to a source of AC electric power and the second transformer winding supplies electric power to loads.The transformer winding connected to the power source is called the primary windings or input windings , and the winding connected to the loads is called the secondary winding or output winding.If there is a third winding on the transformer , it is called tertiary winding