Red Seal Electrician Practice
TransformersQuestion 1121 of 1506

A 200 ohm source must be matched to a 2 ohm load by a transformer. What turns ratio (source side to load side) is needed?

  1. 100:1
  2. 20:1
  3. 1:10
  4. 10:1
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Correct answer: 10:1

The impedance ratio is 100:1. The turns ratio is its square root, which is 10:1.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.7: Special Transformers and Applications

Practice transformers

Questions last reviewed: 18 October 2026