Reflected Load Concept (Transformers) Evaluate the statement: “A reflective load is a load as it appears to the source in the primary of a transformer.”

Introduction / Context:
The idea of a “reflected load” (often phrased as “load referred to the primary”) lets engineers analyze a transformer-coupled system from one side. It is essential in audio output stages, power converters, and impedance matching networks.

Given Data / Assumptions:

• Two-winding transformer with turns ratio Np:Ns.
• Secondary load ZL attached.
• Operation in sinusoidal steady state for simplicity.

Concept / Approach:

The transformer “reflects” the secondary load to the primary by the square of the turns ratio. The effective impedance seen at the primary terminals is Z_reflected = (Np/Ns)^2 * ZL (ideal case). This is exactly what is meant by how the load “appears” to the source at the primary side.

Step-by-Step Solution:

Verification / Alternative check:

Measure input current for a known ZL and compare with the predicted primary current using Z_reflected; bench tests with various turns ratios confirm the squared relationship.

Why Other Options Are Wrong:

“False” denies a standard transformer principle. Limiting it to “ideal only” is unnecessary for the concept; real transformers include copper and core losses, but the referred-impedance method still applies with added series/parallel loss elements.

Common Pitfalls:

Forgetting that power is approximately conserved (minus losses) and that increasing primary-side impedance via turns ratio trades current for voltage and vice versa.

Final Answer:

True