Red Seal Electrician Practice
DC circuitsQuestion 886 of 1506

Current through a coil is being reduced. What kind of voltage does the coil develop?

  1. One that helps the current continue, so the coil acts as a source
  2. One that opposes the current, so the coil acts as a load
  3. None, because the flux is constant
  4. One that is always zero
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Correct answer: One that helps the current continue, so the coil acts as a source

The collapsing field gives up energy and induces a voltage that tries to keep the current flowing.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 15.1: Magnetic Fields and Inductance

Practice dc circuits

Questions last reviewed: 18 October 2026