What is the primary winding in a transformer?

The primary winding in a transformer is the input winding connected across a power line. This winding is responsible for receiving the electrical energy from the source, which creates a magnetic field in the transformer core. The alternating current (AC) flowing through the primary winding induces a voltage in the secondary winding, allowing for the transformation of voltage levels.

This is essential in the functioning of transformers, where the primary side is crucial for initiating the process that allows electrical energy to be transformed from one voltage level to another. The relationship between the primary and the secondary windings determines the voltage increase or decrease in the transformer based on the turns ratio. Thus, identifying the primary winding as the input side connected to the power source clearly highlights its role in the operation of a transformer.