Why Thoriated Tungsten Filament?
Thoriated Filaments a Small Amount of Thorium Is Added to the Tungsten of the Filament. .. . Thoriated Filaments Can Have Very Long Lifetimes and Are Resistant...
What is the function of tungsten filament?
The tungsten filament of a vacuum incandescent lamp is heated to temperatures where visible light is emitted by resistance heating. The filament acts as an electrical resistor, which dissipates power proportional to the voltage applied, times the current through the filament.
Why is thorium added to the tungsten inside the filament?
Thorium has a lower work-function than Tungsten so the effective work-function of the filament is that of Thorium. ... The Fermi level of thorium is higher than tungsten's, thus closer to the energy of free electrons in vacuum.
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