Red Seal Electrician Practice
TransformersQuestion 1120 of 1506

Under the maximum power transfer idea, when does a load receive the most power from a source?

  1. When the load impedance is much lower than the source
  2. When the load impedance is much higher than the source
  3. When the load has zero reactance
  4. When the load impedance equals the source impedance
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Correct answer: When the load impedance equals the source impedance

The maximum power is delivered when load and source impedance match. A transformer can be used to make them match.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.7: Special Transformers and Applications

Practice transformers

Questions last reviewed: 18 October 2026