In a basic transformer, what is the role of the primary winding?

The primary winding of a transformer plays a crucial role in producing magnetic flux. When alternating current (AC) flows through the primary winding, it generates an alternating magnetic field around the winding. This magnetic field is fundamental to the operation of the transformer, as it creates the magnetic flux that links with the secondary winding.

This magnetic coupling between the primary and secondary allows for energy transfer between the two windings. In a transformer, the primary winding's main function is not to convert AC to DC or to store energy; rather, it facilitates the induction of voltage in the secondary winding, which can either increase or decrease the voltage depending on the turns ratio of the transformer.