Transformer Windings: Primary vs. Secondary Connections Evaluate the statement: “The primary is the winding connected to the source, and the secondary is the winding connected to the load.”

Introduction / Context:
Correctly naming transformer windings helps avoid wiring mistakes and data-sheet misinterpretation. The distinction between “primary” and “secondary” is based on connection, not on voltage magnitude or physical size of the winding.

Given Data / Assumptions:

• A two-winding transformer operated in normal direction.
• Source side and load side can be swapped in some applications, but names follow connection.
• AC excitation and passive magnetic coupling apply.

Concept / Approach:

By convention, the winding connected to the input source is the primary, and the winding delivering power to the load is the secondary. Either winding may be higher or lower voltage depending on turns ratio and application (step-down or step-up). Naming does not imply voltage level.

Step-by-Step Solution:

Verification / Alternative check:

Datasheets label terminals “PRI” (primary) and “SEC” (secondary) with connection diagrams, confirming the naming depends on which side is tied to the source.

Why Other Options Are Wrong:

Restricting truth to step-down or center-tapped designs is unnecessary. The primary is not “always the higher-voltage winding”; step-up operation flips that condition.

Common Pitfalls:

Assuming the thicker wire is always the primary or that primary must be the higher voltage—both may vary with design constraints.

Final Answer:

True