How auto transformer is different from transformer?

Question

Accepted Answer

Auto transformer is a type of transformer that has a single winding, while a transformer has separate primary and secondary windings.

Auto transformer has a single winding, while transformer has separate primary and secondary windings.
Auto transformer has a common portion of winding shared by both primary and secondary circuits.
Auto transformer is smaller in size and lighter in weight compared to transformer.
Auto transformer is less expensive than transformer.
Auto transformer has a lower efficiency compared to transformer.
Auto transformer is used in applications where the voltage transformation ratio is not critical, such as voltage regulation or impedance matching.

Accepted Answer

In an autotransformer, portions of the same winding act as both the primary winding and secondary winding sides of the transformer. In contrast, an ordinary transformer has separate primary and secondary windings which have no metallic conducting path between them.

How auto transformer is different from transformer?

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