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The filament of a light bulb gets much hotter as the supply voltage rises, so its resistance changes. What kind of conductor is it?
AA non-ohmic conductor
BAn ohmic conductor
CA perfect insulator
DA superconductor
Answer & Solution
Correct answer: A. A non-ohmic conductor
1. Conductors that keep a constant resistance while voltage varies are called ohmic conductors.
2. The resistance of a filament wire increases dramatically as it warms to operating temperature.
3. A light bulb is therefore a common example of a non-ohmic conductor.
4. Its graph of voltage against current is a curve rather than a straight line.
_Source: Siyavula Physical Sciences Grade 11 (Everything Science, CC BY 4.0), Chapter 11: Electric circuits_
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