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The Resistance of a Lamp.

How does the Resistance of a Lamp
Change with Temperature?

A filament lamp is a component that does not
obey ohm's law. The resistance of a lamp
as its temperature increases.
This page
shows a plot of current against voltage for
a filament lamp. The plot is not a straight line.

Plot of Current against Voltage for a Lamp

Why does t
he Resistance
of a Filament Lamp Change with Temperature?

Inside a traditional filament lamp, the thin wire  
(called the filament) gets very hot when a current
flows through it and it glows brightly. This rise in
temperature causes an increase in resistance of the
filament, and so the gradient of the plot changes.
There are other more efficient forms of lighting.

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