what is the symbol of tungsten present in electric bulb?how was this symbol decided?
Answers
Answer:-
Tungsten was not the first filament material. Carbonized thread and platinum were were used successfully in the late 1800's. Carbonized thread is not very durable and platinum is too expensive and rare.
Thomas Edison, who had purchased an incandescent light patent from a Canadian, commercialized a carbonized bamboo filament that finally made incandescent lighting reliable and affordable. However this material could not survive temperatures needed to produce white light very long. Tungsten wire is one of the few substances that can conduct sufficient electricity to reach 7000 Degrees C while maintaining enough strength to last thousands of hours and survive mild bumps and vibration. Platinum is far too expensive and most other metals would melt or evaporate at those temperatures. Lower temperatures give a more feeble orange light rather than the bright daylight white you get from tungsten.
In 1906 General Electric patented the tungsten filament.
It became the filament of choice for several reasons.