Red Seal Electrician Practice
TransformersQuestion 1094 of 1506

What does electrical isolation by a transformer mean?

  1. Power moves between circuits with no direct wire connection.
  2. The two windings share one conductor.
  3. The secondary voltage is always equal to the primary voltage.
  4. The core is connected to the ground only.
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Correct answer: Power moves between circuits with no direct wire connection.

The windings are linked only by the magnetic field. No conductor joins the two circuits.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.3: Electrical Isolation

Practice transformers

Questions last reviewed: 18 October 2026