FACT SCIENCE
Why does the filament in the bulb glow?
The electric bulb is a glass
bulb fitted with a filament that glows when heated by electricity. Thomas Alva Edison
invented the light bulb. The light bulb consists of a glass bulb. It is fitted
with a filament made of tungsten. The filament is heated to candescence by
passing an electric current through it the glass bulb is filled with a noble
gas that prevent the filament from melting and then evaporating. Many attempts were made to
make a bulb before Edison succeeded. The lifespan of the bulb was however approximately
40 hours. Edison conducted many experiments to extend the lifespan of the
filament. He finally succeeded in December 1879.
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