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[Phys-L] Re: light bulb transient



On Nov 13, 2005, at 1:38 PM, John Denker wrote:
Metals are ohmic so long as one holds their temperature constant.
But changing the temperature of
a metal changes R slightly. Therefore such a device as an electric
light bulb increases its
temperature as it warms up, which is why it glows slightly
brighter for a very brief time just
after it is turned on.

Comments, anyone?

Is this saying that an incanescent bulb glows brighter when it is
cooler? I disagree.

What do I win?!
---
Michael Porter
Colonel By Secondary School
Ottawa, Ontario, Canada
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