Red Seal Electrician Practice
TransformersQuestion 880 of 1506

The primary of a transformer is connected to a steady DC battery. What is the output of the secondary once the current is steady?

  1. None, since the flux is steady
  2. The same voltage as the battery has
  3. Double the battery voltage at all times
  4. A voltage with the opposite polarity
Show answer

Correct answer: None, since the flux is steady

Mutual inductance needs changing flux, so a transformer needs AC or pulsed DC.

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

Practice transformers

Questions last reviewed: 18 October 2026