How a Lightbulb Works
An electric current passes through a very thin filament of tungsten, a gray-white, heavy, hard metallic element. Current passing through the very thin filament encounters very high resistance and forces the filament to heat to a temperature of 2,500ºC until it is white hot. Light resulting from heating is called incandescent light.
credit: ScienceVIEW staff
Click here
if the movie window is blank or won't load. You may need to install QuickTime™ on your computer.