TransformersQuestion 1434 of 1506

A transformer must change 600 V to 120 V. The primary winding has 600 turns. How many turns must the secondary winding have?

  1. 480 turns
  2. 600 turns
  3. 120 turns
  4. 720 turns
Show answer

Correct answer: 120 turns

Ns = Np × (Vs ÷ Vp) = 600 × (120 ÷ 600) = 120 turns.

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

Practice transformers

Questions last reviewed: 18 October 2026