Red Seal Electrician Practice
DC circuitsQuestion 407 of 1506

A string of decorative lights stops working completely when one lamp burns out. How are the lamps connected?

  1. In parallel, so an open lamp removes the supply voltage
  2. In series-parallel, so each lamp has its own switch
  3. In series, so an open lamp stops the current
  4. In parallel, so the burned lamp shorts the other lamps
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Correct answer: In series, so an open lamp stops the current

A series circuit has one path. One open lamp stops the current in all of them.

Source: Electrical Fundamentals Competency (Industry Training Authority of BC), 7.1: Series Circuits

Practice dc circuits

Questions last reviewed: 18 October 2026