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Light bulb filaments are made of tungsten. Tungsten is a metal. Metals are
ohmic substances. Ohmic substances obey Ohm's law. What it *means* to obey
Ohm's law is that for a uniform current through a uniform sample of the
substance, the current intensity in an asymptotic steady state is
proportional to the electric potential difference across the sample for a
wide range of current intensities and potential drops. The proportionality
constant *may* be (and almost always is to some degree) temperature-
dependent. The proportionality condition is to hold for a given *fixed*
temperature of the sample.
...
David Bowman
dbowman@gtc.georgetown.ky.us