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Originally Posted by BrianG
I just read the that HSW article and I didn't particularly like their lightbulb example. The way it was stated led the reader to believe a 100W lightbulb will always produce 100W no matter the applied voltage.
The incandescent lightbulb is also a bad example because the filament does not have a linear resistance either. Its resistance is close to 0 when no current is flowing (off) and the resistance increases as it heats up from the current flow. Incidentally, this is why a bulb amost always blows when you first turn it on - from the initial inrush of current while the filament resistance is lowest.
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100W of equivalent optical power, which will be based on temp of filament, which has its max at say 5000K then it melts...
Artur
P.S. howstuffworks -> internet is fantastic :)