A basic transformer is made from two coils of wire; a primary coil from the ac input and a secondary coil leading to the ac output. The coils are not electrically connected. Instead, they are wound around an iron core. This is easily magnetised and can carry magnetic fields from the primary coil to the secondary coil.

What materials are used to make a transformer?

Apart from active materials like copper and cold rolled grain oriented silicon steel, a number of ferrous, nonferrous and insulating materials are employed for building up a transformer.

What is inside of a transformer?

Distribution transformers consist of a magnetic core made from laminations of sheet silicon steel (transformer steel) stacked and either glued together with resin or banded together with steel straps, with the primary and secondary wire windings wrapped around them.