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Transfomer vs Autotransformer - What's the difference?

transfomer | autotransformer |

As a noun autotransformer is

a transformer with a single winding, output being taken from taps.

autotransformer

Noun

(en noun)
  • a transformer with a single winding, output being taken from taps
  • *
  • One of the principal features of the ordinary configurations of the transformer [...] is the electrical isolation that exists between the primary and secondary windings. [...] Whenever large transformation ratios are involved, safety demands that ordinary transformers be used. However, in instances where the transformation ratio is close to unity (which minimizes the hazard), a transformer employing a single tapped winding may be used with notable advantages.
    [...] This arrangement is called the autotransformer .