Red Seal Electrician Practice
TransformersQuestion 1424 of 1506

A single-phase transformer has 480 turns on the primary and 120 turns on the secondary. The primary is connected to 480 V. What is the secondary voltage?

  1. 208 V
  2. 1920 V
  3. 120 V
  4. 360 V
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Correct answer: 120 V

Vs = Vp × (Ns ÷ Np) = 480 × (120 ÷ 480) = 120 V.

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

Practice transformers

Questions last reviewed: 18 October 2026