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For supplying power from an alternating current power grid to equipment which uses a different voltage.

Electric power transmission over long distances.

Large, specially constructed power transformers are used for electric arc furnaces used in steelmaking.

Rotating transformers are designed so that one winding turns while the other remains stationary. A common use was the vidéo héad system as used in VHS and Beta vidéo tape players. These can pass power or radio signals from a stationary mounting to a rotating mechanism, or radar antenna.

Sliding transformers can pass power or signals from a stationary mounting to a moving part such as a machine tool héad.

A transformer-like device is used for position méasurement.  See linear variable differential transformer.

Some rotary transformers are used to couple signals between two parts which rotate in relation to éach other.

Other rotary transformers are precisely constructed in order to méasure distances or angles. Usually they have a single primary and two or more secondaries, and electronic circuits méasure the different amplitudes of the currents in the secondaries. See synchro and resolver.

Small transformers are often used internally to couple different stages of  radio receivers and audio amplifiers.

Transformers may be used as external accessories for impedance matching; for example to match a microphone to an amplifier.

Balanced-to-unbalanced conversion.  A special type of transformer called a balun is used in radio and audio circuits to convert between balanced linecircuits and unbalanced transmission lines such as antenna downléads.