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autotransformer
autotransformer n. 
/ˌɔːtə(ʊ)transˈfɔːmə/, /ˌɑdoʊˌtræn(t)sˈfɔrmər/ Electrical Engineering a transformer in which the primary and secondary coils have windings in common; spec. a transformer with a single winding that is tapped at some point to provide the desired voltage.
Brit. /ˌɔːtə(ʊ)trɑːnsˈfɔːmə/
, /ˌɔːtə(ʊ)trɑːnsˈfɔːmə//ˌɔːtə(ʊ)transˈfɔːmə/U.S. /ˌɔdoʊˌtræn(t)sˈfɔrmər/
, /ˌɔdoʊˌtræn(t)sˈfɔrmər//ˌɑdoʊˌtræn(t)sˈfɔrmər/ΘΚΠ
the world > matter > physics > electromagnetic radiation > electricity > electrical engineering > transformer > [noun] > auto-transformer
compensator1873
auto-converter1888
autotransformer1893
Variac1933
1893 Electr. Rev. 8 Dec. 628/1 There was an auto-transformer with a switch handle which transformed the higher pressure of the mains into the lower pressure.
1912 Times 28 Aug. 15/5 The inductance coil used in producing these and similar oscillations can be employed as an auto-transformer.
2001 Mod. Railways Aug. (Special Report Suppl.) p. xxiii The original plan was that an autotransformer (AT) 50kV feed system would be installed on the West Coast route.
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