Red Seal Electrician Practice
TransformersQuestion 882 of 1506

A step-up transformer raises the voltage from primary to secondary. How does the secondary current compare with the primary current?

  1. It is higher, by the same ratio.
  2. It is the same.
  3. It is zero.
  4. It is lower, by the same ratio as the voltage rise.
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Correct answer: It is lower, by the same ratio as the voltage rise.

Voltage and current change in opposite proportion, so power stays about the same.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 14.6: Mutual Inductance

Practice transformers

Questions last reviewed: 18 October 2026