TransformersQuestion 1432 of 1506

A transformer must change 480 V to 240 V. The primary winding has 1200 turns. How many turns must the secondary winding have?

  1. 1800 turns
  2. 600 turns
  3. 1200 turns
  4. 2400 turns
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Correct answer: 600 turns

Ns = Np × (Vs ÷ Vp) = 1200 × (240 ÷ 480) = 600 turns.

Source: Computed, 1.1: What is Alternating Current (AC)?

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Questions last reviewed: 18 October 2026