Red Seal Electrician Practice
TransformersQuestion 1103 of 1506

A single secondary winding is tapped to give two voltages. What is the cost of using taps instead of separate windings?

  1. The voltage ratio no longer follows the turns ratio of the sections.
  2. Electrical isolation between the tapped sections is lost.
  3. The primary current is doubled for every tap that is used.
  4. The core must be made of solid iron to carry the extra flux.
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Correct answer: Electrical isolation between the tapped sections is lost.

Tapped sections still follow the turns ratio. But they share one winding, so they are not isolated from each other.

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

Practice transformers

Questions last reviewed: 18 October 2026