Transformers work by using electromagnetic induction to transfer electrical energy from one circuit to another through a shared magnetic field. The primary coil of wire, also known as the input winding, is connected to the source of electrical power, and the secondary coil, also known as the output winding, is connected to the load. The number of turns in the primary and secondary coils determines the ratio of voltage transformation. Check out our YouTube Channel (HVAC School) for the whole vide