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What are carbon filaments for light bulbs?
Modern light bulb filaments are usually Tungsten not Carbon. However early bulbs used things like silk coated with Carbon. Filament means thin thread. The bulbs are filled with inert gas like Argon to stop the filament from burning up with oxygen. Arc lamps use Carbon rods though.
Why are V-i characterstics different for tungsten and carbon lamp?
As carbon filament bulbs have a negative temperature coefficient and tungsten filament light bulbs have a positive temperature coefficient.
What did early light bulbs have inside them?
the first one was carbon filament
What makes up the filament of light bulbs?
Filament of light bulbs are made up of Tungsten.
What elements are in light bulbs as a filament?
Light bulb filaments are usually made of tungsten, which has a very high melting point. Occasionally carbon is used as a filament.
Should you replace filament light bulbs with energy saving bulbs?
Yes, on an attritional basis, as the old ones burn out-
Is mercury used for the filament in light bulbs?
No, not in the filament. You are probably thinking of compact fluorescent light bulbs, which do contain mercury.
Why do light bulbs have the coil in the middle?
That is the filament. Electricity traveling through the filament heats it to the point of glowing brightly - that is the light bulbs "light".
What happens to the filament when light bulbs blows?
The filament breaks.
What is in filament of light bulbs?
tungsten
Why should the filament of bulbs be thermally isolated?
Energy, in the form of electricity, causes the filament to heat up and give off light. Any energy which the filament loses by heating the bulb does not create light, and so is wasted. Thermal isolation minimizes the heat loss of the filament, and therefore reduces wasted energy.
When electric flows through the metal filament of a high light bulbs what is electric energy transformed too?
Heat and light. The metal filament heats up to the point of incandescence in the visible part of the spectrum.
