An auto transformer is a transformer in which at least two windings have a common part.
In an auto transformer, one single winding is used as primary winding as well as secondary winding.
Alternatively in two windings transformer two different windings are used for primary and secondary purpose.
In an auto transformer, one single winding is used as primary winding as well as secondary winding.
Alternatively in two windings transformer two different windings are used for primary and secondary purpose.