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Current Electricity: Ohmic vs Non-ohmic MCQ

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Ohmic vs Non-ohmicMediumQuestion 31615

Question

Which device is NON-ohmic?
  1. A
    Copper wire at room temperature
  2. B
    Carbon resistor
  3. C
    Tungsten filament lamp (over wide temperature range)
    Correct
  4. D
    Nichrome wire

Correct answer

Tungsten filament lamp (over wide temperature range)

Explanation

A tungsten filament's resistance increases greatly with temperature as it heats up (from ~20°C to ~3000°C), so I-V is not linear over a wide range — it's non-ohmic in practice.

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