Evaluate the statement about transformer coupling in a half-wave rectifier “An advantage of using transformer coupling in a half-wave rectifier is that it allows the AC source to be directly connected to the load.” Is this statement valid?

Introduction / Context:
Half-wave rectifiers commonly use a transformer between the AC source and the rectifying diode. Transformers provide isolation, voltage scaling, and impedance matching. The notion of “directly connecting the AC source to the load” misunderstands the purpose and behavior of transformer coupling.

Given Data / Assumptions:

• Single-diode half-wave rectifier with a transformer-isolated secondary feeding the rectifier and load.
• Ideal components for conceptual clarity.
• “Directly connected” is taken to mean a galvanic connection from source mains to the load terminals.

Concept / Approach:
Transformer coupling introduces galvanic isolation: the primary and secondary are magnetically coupled but electrically separate. The AC source energizes the primary; the load is connected to the secondary, typically through a rectifier and filter. Thus the load is not directly tied to the primary AC source. Benefits of the transformer include adjustable secondary voltage (turns ratio), safety isolation, and reduced diode stress by proper voltage selection.

Step-by-Step Solution:

Verification / Alternative check:
Remove the transformer and connect the diode and load directly to the AC source; you lose isolation and voltage scaling, contradicting the typical advantages sought by transformer coupling.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing “coupling” with “direct wiring”; assuming 1:1 transformers remove isolation (they do not; galvanic isolation remains).

Final Answer:
Incorrect