Red Seal Electrician Practice
DC circuitsQuestion 851 of 1506

A capacitor is connected to a DC source and is fully charged. What is the capacitor current at that point?

  1. Maximum, because the voltage is highest
  2. Equal to the source voltage divided by the plate gap
  3. Reversed and equal to the charging current
  4. Zero, as its voltage equals the source
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Correct answer: Zero, as its voltage equals the source

Current flows only while the capacitor voltage is changing. When voltage equals the source, the current decays to zero.

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

Practice dc circuits

Questions last reviewed: 18 October 2026