Red Seal Electrician Practice
TransformersQuestion 1107 of 1506

A 120 V primary is wired with a 12 V secondary in the bucking connection. What is the load voltage?

  1. 108 V
  2. 132 V
  3. 12 V
  4. 120 V
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Correct answer: 108 V

In the bucking connection the secondary voltage subtracts from the primary voltage: 120 V - 12 V = 108 V. The boosting connection would give 132 V.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 10.5: Winding Configurations

Practice transformers

Questions last reviewed: 18 October 2026