Red Seal Electrician Practice
TransformersQuestion 1080 of 1506

A transformer is designed with too little primary inductance. What is the result at light load?

  1. A large magnetizing current in the primary
  2. A very low primary current with no load
  3. No voltage at all in the secondary
  4. A higher efficiency at light load
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Correct answer: A large magnetizing current in the primary

Less inductive reactance means more current is used just to magnetize the core.

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

Practice transformers

Questions last reviewed: 18 October 2026