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If you mean how they work then magnetic fields

Induction. Voltage applied to one winding induces a voltage in another winding. The voltage induced is dependent upon the turns ratio between the two windings.

Current is said to be induced in the other winding as well (since a voltage is induced, current will flow if the circuit is complete). Depending on the transformer type, current may flow directly from the series winding (in autotransformers, for example) to the secondary output (conduction, as opposed to induction).

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