alleryStart learning →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_
Keep practising Electric Circuits
Browse all Electric Circuits questions for UCE (O-Level), or explore more Physics topics.
Related questions
Fill in the circuit ruleHousehold electricity is sold in units of one kilowatt hour. What does one kilowatt hour mA lamp dissipates 60 watts and is left on for 120 seconds. How much electrical energy doesA current of 4 amperes passes through a heater while the voltage across it is 12 volts. WhHow is the equivalent resistance of several resistors joined in series worked out?Three resistors are joined one after another in a single loop with a cell. How does the cuOhm's law describes a metal conductor only while which quantity is held constant?