AC theoryQuestion 1053 of 1506

Which of these loads is nonlinear?

  1. A heating element at constant temperature
  2. A gas-discharge lamp
  3. A pure resistor
  4. An ideal wire
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Correct answer: A gas-discharge lamp

Nonlinear parts draw current that is not proportional to the voltage and so create harmonics.

Source: Lessons in Electric Circuits II: AC (Kuphaldt), 7.7: Harmonics in Polyphase Power Systems

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Questions last reviewed: 18 October 2026