Transformer Construction Basics Evaluate the statement: “A transformer consists of two or more cores that are electrically coupled on a common core.”

Introduction / Context:
Transformers enable voltage level changes and isolation using electromagnetic induction. This question distinguishes the roles of windings and core, and the difference between electrical versus magnetic coupling.

Given Data / Assumptions:

• Conventional iron-core or ferrite-core transformer.
• Sinusoidal AC excitation for standard operation.
• No special multi-core coupled structures implied.

Concept / Approach:

A standard transformer has two or more windings (coils) magnetically coupled via a common magnetic core. The coupling mechanism is magnetic (via changing flux), not electrical. Saying “electrically coupled cores” confuses the terminology: it is windings that are placed on one core, and they are magnetically coupled.

Step-by-Step Solution:

Verification / Alternative check:

Open any basic transformer diagram: a single core with multiple windings. Equivalent circuits use magnetizing inductance and mutual inductance, emphasizing magnetic, not electrical, coupling.

Why Other Options Are Wrong:

All “True …” choices misstate the fundamental structure. Three-phase cores may use three legs but still rely on magnetic coupling of windings placed on the same laminated core, not “electrically coupled cores.”

Common Pitfalls:

Confusing the phrase “electromagnetic induction” with “electrical coupling,” and mixing up the role of the core (provides a flux path) versus windings (provide turns ratio and carry current).

Final Answer:

False