what is a autotransformer
Autotransformer. Autotransformer (Auto-Transformer) is an electrical transformer in which there is one winding, a portion of which is common to both the primary and the secondary circuits.An autotransformer uses common winding and offer no interference or disturbance isolation.utotransformer. Autotransformer (Auto-Transformer) is an electrical transformer in which there is one winding, a portion of which is common to both the primary and the secondary circuits.