Which winding of a transformer is supplied with voltage?

In a transformer, the primary winding is the one that is connected to an external voltage source. This winding receives the input voltage and generates a magnetic field that induces a voltage in the secondary winding through electromagnetic induction.

The primary winding is critical for the operation of the transformer, as it effectively converts electrical energy from the source into magnetic energy. This magnetic energy then transforms back into electrical energy in the secondary winding, where the voltage can be stepped up or stepped down depending on the turns ratio of the windings.

The secondary winding, in contrast, is the winding that delivers the output voltage to the load, while the load refers to the component or circuit consuming the power. The neutral isn't a winding but rather a reference point or ground in the system. Thus, the primary winding is responsible for being supplied with voltage, initiating the transformer’s operation.