DC circuitsQuestion 841 of 1506

Why do power utilities consider seasonal temperature changes when they work out how much load a line can carry?

  1. Line voltage is set by the season.
  2. Insulators change colour with the season.
  3. Line resistance changes with temperature.
  4. Frequency drifts with the outdoor temperature.
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Correct answer: Line resistance changes with temperature.

Conductor resistance moves with temperature, which changes the losses and the voltage drop along the line.

Source: Lessons in Electric Circuits I: DC (Kuphaldt), 12.6: Temperature Coefficient of Resistance

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Questions last reviewed: 18 October 2026