auto transformer


noun Electricity.
a transformer having a single coil that serves as both a primary coil and a secondary coil.

1890–95; auto-1 + transformer Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
autotransformer (ˌɔːtəʊtrænsˈfɔːmə)
a transformer in which part of the winding is common to both primary and secondary circuits

Collins English Dictionary - Complete & Unabridged 10th Edition
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