obey ohm's law. The resistance of a lamp
increases as its temperature increases. This page
shows a plot of current against voltage for
a filament lamp. The plot is not a straight line.
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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
increases as its temperature
increases. This page
shows a plot of current
against voltage for
a filament lamp. The plot
is not a
straight line.
Why does the
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.
Links
Electricity
Resistance
Revision Questions
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