Autotransformer definition

ôtō-trăns-fôrmər
An electrical transformer in which the primary and secondary coils have some or all windings in common.
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(elec.) A transformer with at least part of the windings common to both the primary and the secondary circuits.
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A transformer with a single winding, output being taken from taps.
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Other Word Forms

Noun

Singular:
autotransformer
Plural:
autotransformers