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autotransformer

   Also found in: Medical, Wikipedia 0.06 sec.
au·to·trans·form·er  (ôt-trns-fôrmr)
n.
An electrical transformer in which the primary and secondary coils have some or all windings in common.
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The device increases or decreases the active power supplied to the lamps of a ballasted lighting system -- without abrupt voltage changes -- using definitive, multi-staging of selected tap points provided on a toroidal autotransformer controlled by digital switching.
Element Service, Inc. and Utilisource Corp. Team up with Electric ... by Business Wire
Technipower products include autotransformers sold under the Variac name, and customized power supplies.
Power Designs announces acquisitions by Business Wire
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