Red Seal Electrician Practice
TransformersQuestion 1077 of 1506

A transformer secondary voltage sags as the load current rises. What is the cause?

  1. The core gets colder as the load rises
  2. The supply frequency rises with the load
  3. The number of primary turns increases
  4. Leakage inductance acts as series impedance
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Correct answer: Leakage inductance acts as series impedance

Flux that does not link both windings adds series reactance, and the voltage drops across it.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.1: Mutual Inductance and Basic Operation

Practice transformers

Questions last reviewed: 18 October 2026