Does a tungsten lamp filament obey Ohm's Law?
A) Yes, because it is a pure metal conductor
B) No, because its resistance increases significantly as the voltage applied across it increases

Question

Quizplus · Accepted Answer

A tungsten lamp filament does not obey Ohm's Law because its resistance increases significantly with an increase in voltage applied across it. This is due to the phenomenon of joule heating, which causes the temperature of the filament to increase, leading to an increase in resistance. Therefore, the relationship between the voltage and current through the filament is not linear and cannot be described by a simple proportionality, as predicted by Ohm's Law.

Does a Tungsten Lamp Filament Obey Ohm's Law