Red Seal Electrician Practice
TransformersQuestion 1129 of 1506

A step-down transformer is rated 1 kVA, 120 V primary and 48 V secondary. What is the full-load secondary current?

  1. 8.3 A
  2. 20.8 A
  3. 2.5 A
  4. 41.7 A
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Correct answer: 20.8 A

I = VA / V = 1000 VA / 48 V = 20.8 A. The 8.3 A choice is the primary current (1000 VA / 120 V).

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

Practice transformers

Questions last reviewed: 18 October 2026