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.

Autotransformer

Meaning

Noun

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