TransformersQuestion 1130 of 1506

How are large transformers usually rated?

  1. By winding voltage and VA or kVA
  2. By winding voltage and watts only
  3. By core weight
  4. By frequency and power factor
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Correct answer: By winding voltage and VA or kVA

A transformer cannot know the load power factor, so the rating is in VA, which limits the current.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.8: Practical Considerations - Transformers

Practice transformers

Questions last reviewed: 18 October 2026