Electronics Technician E-5 Advancement Practice Exam 2026 - Free Electronics Technician Practice Questions and Study Guide

The term that refers to the amount of energy transferred from the primary to the secondary of a transformer is best described as power transfer. Transformers operate on the principle of electromagnetic induction, transferring electrical energy from the input (primary) side to the output (secondary) side. The effectiveness of this transfer is crucial for the transformer’s performance, as it indicates how much of the input power is converted and delivered to the output load.

When evaluating the other terms, voltage ratio refers to the relationship between the voltages in the primary and secondary circuits and does not directly measure the energy transfer. Coupling, on the other hand, pertains to how effectively the magnetic field links the primary and secondary coils but does not quantify energy transfer itself. Efficiency indicates how much useful power is delivered compared to the power consumed but does not directly define the amount of energy transferred. Therefore, power transfer is the most accurate term for the energy movement between the primary and secondary of a transformer.