Red Seal Electrician Practice
DC circuitsQuestion 411 of 1506

An electrician changes one lamp in a series circuit to a lamp with a different resistance. What is the effect on the other lamps?

  1. Nothing changes, because each lamp has its own voltage
  2. Only their power values change
  3. Only their voltage drops change
  4. Their current, voltage and power values all change
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Correct answer: Their current, voltage and power values all change

In a series circuit all components share the same current, so a change in one part changes the whole circuit.

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

Practice dc circuits

Questions last reviewed: 18 October 2026