What distinguishes primary windings from secondary windings in a transformer?

• A. The type of voltage supplied
• B. The position of the windings within the transformer
• C. The source of input voltage
• D. The load connected to the winding

Answer: (C)

The distinction between primary windings and secondary windings in a transformer primarily revolves around the source of input voltage. The primary winding is the coil that is connected to the alternating current (AC) power source, which provides the input voltage that induces a magnetic field in the transformer. This magnetic field then interacts with the secondary winding, where induced voltage is created based on the turns ratio between the two windings.

Essentially, the primary winding is responsible for drawing power from the electrical supply, while the secondary winding is connected to the load that uses the transformer’s output voltage.

The other aspects may influence transformer operation but do not distinctly separate the two types of windings. The type of voltage supplied may apply to both windings, and while the position of the windings within the transformer is a physical characteristic, it does not define their function. Similarly, while the load affects the operation and performance of the transformer, it does not differentiate between primary and secondary windings directly.