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Resistance
This page shows plots for components which don't obey Ohm's Law.
1.
The thin wire (filament)
inside the light bulb
gets
very hot when it glows brightly.
This rise in temperature causes an increase in resistance of
the filament,
and so the gradient (slope) of the plot is
seen to increase.
2. A thermistor is a special
type of resistor
which has been deliberately
manufactured so that its
resistance decreases as its
temperature rises.
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