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Related to autotransformer: autotransformer starter
An electrical transformer in which the primary and secondary coils have some or all windings in common.
(Electrical Engineering) a transformer in which part of the winding is common to both primary and secondary circuits
au•to•trans•form•er(ˌɔ toʊ trænsˈfɔr mər)
a transformer having a single coil that serves as both a primary coil and a secondary coil.