Red Seal Electrician Practice
TransformersQuestion 1102 of 1506

A transformer has one primary and three separate secondary windings. How are the secondary circuits related electrically?

  1. They are all at the same voltage.
  2. They share one conductor.
  3. They are isolated from one another.
  4. They must all supply the same current.
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Correct answer: They are isolated from one another.

Each secondary is its own winding on the common core. Each circuit is isolated from the others and can have its own voltage.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.5: Winding Configurations

Practice transformers

Questions last reviewed: 18 October 2026