Which statement is true about the secondary winding of a step-down transformer?

The statement regarding the secondary winding of a step-down transformer that is true is that it has fewer turns than the primary winding. In a step-down transformer, the primary winding has more turns of wire compared to the secondary winding. This design allows the transformer to reduce the voltage from the primary side to a lower voltage on the secondary side while increasing the current.

This principle relies on Faraday's law of electromagnetic induction, where the voltage induced in a winding is proportional to the number of turns of the wire. Therefore, in a step-down transformer, having fewer turns in the secondary winding results in a lower voltage output, which is a defining characteristic of this type of transformer. This explanation establishes the fundamental operational principle of step-down transformers, distinguishing them from step-up transformers where the secondary winding would have more turns than the primary.