Red Seal Electrician Practice
DC circuitsQuestion 364 of 1506

What happens in a series circuit when one component opens?

  1. Only that part stops
  2. Current doubles
  3. Voltage drops to zero only at the source
  4. The whole circuit stops working
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Correct answer: The whole circuit stops working

There is only one path, so any open breaks it.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 2.2: Series Circuits

Practice dc circuits

Questions last reviewed: 18 October 2026