What is a transformer primarily used for?

A transformer is primarily used to change the voltage level of an alternating current (AC) supply. This device operates on the principle of electromagnetic induction and is designed to either increase (step-up) or decrease (step-down) the voltage of AC power while maintaining power conservation, meaning the power input and output are roughly equal, assuming minimal losses.

Transformers are essential components in electrical systems for various applications, such as adjusting voltage levels for transmission over long distances to reduce losses and making voltages suitable for residential or industrial use. Therefore, their primary function aligns directly with the redistribution of AC voltage levels according to the needs of the electrical system, making them pivotal in HVAC systems, power distribution networks, and many types of machinery and equipment.