Red Seal Electrician Practice
TransformersQuestion 1098 of 1506

An electrician needs to reverse the phase relationship between the primary and secondary of a small transformer. What is the simple way?

  1. Replace the core with a laminated core.
  2. Raise the supply frequency.
  3. Add a tap on the secondary.
  4. Swap the connections of one winding.
Show answer

Correct answer: Swap the connections of one winding.

The dots only mark the winding ends. Swapping the winding connections reverses the phase relationship.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.4: Phasing

Practice transformers

Questions last reviewed: 18 October 2026