TransformersQuestion 1071 of 1506

What is the exciting current of a transformer?

  1. The total no-load primary current
  2. The secondary load current at full rated load
  3. The inrush current at the moment of start
  4. The current in the ground wire of the case
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Correct answer: The total no-load primary current

It is the magnetizing current plus what is needed to cover core losses.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.1: Mutual Inductance and Basic Operation

Practice transformers

Questions last reviewed: 18 October 2026