Red Seal Electrician Practice
DC circuitsQuestion 847 of 1506

What does a capacitor tend to do when the voltage across it changes?

  1. It opposes changes in current by dropping voltage.
  2. It opposes the change by drawing or supplying current.
  3. It allows the voltage to follow instantly with no current.
  4. It turns the change into heat only.
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Correct answer: It opposes the change by drawing or supplying current.

A capacitor tries to hold its voltage constant. It does this by taking current from or giving current to the source of the change.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 13.1: Electric Fields and Capacitance

Practice dc circuits

Questions last reviewed: 18 October 2026