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A very small filament of tungsten can radiate away 100 Watts. Imagine how much power a plate of tungsten could radiate.



Isn’t that also related to surface area? Light bulb filaments are highly coiled, like DNA. That gives a lot more surface area than a plate would.


The coil is for resistance. You want the voltage drop to be across the filament. The coil of thin wire gives it significant length.




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