Light Bulb Invention | How Bulb Works
Before the Light Bulb Invention, people used to light fire for light. In the 18th century, candles and lamps made from oil were started to be used. After this, around the beginning of the 19th century, lamps made from gas were started to be used.
How Bulb Works
The electric bulb was first invented by Edison. It consists of a thin coiled filament of tungsten metal. To prevent oxidation of this metal, the inside of the bulb is vacuumed.
Its cover is made of thin glass. Sometimes instead of vacuuming completely inside the bulb, some inert gas like nitrogen is filled in it. Tungsten metal is used because its melting point is very high (about 3500 °C). (Light Bulb Invention) When current flows through the filament, its temperature rises from 1500°C to 2500°C.
At this temperature the filament starts giving light. In these types of bulbs, only 5 to 10% of the energy expended is converted into light. The remaining energy is converted into heat and leaves the bulb.
Inert gas is filled in the bulb because tungsten metal vaporizes at high temperature in a vacuum and it vaporizes and sticks to the walls of the bulb. This is called ‘blackening’. After this process the fibers become weak.
Light Bulb Invention By Thomas Alva Edison
The light bulb was invented by Thomas Alva Edison in 1879. The Light Bulb or Incandescent Light Bulb is one of the most famous inventions of Thomas Alva Edison.
In 1878 he began serious research to develop a practical Incandescent Lamp. After several experiments with platinum and other metal fibers, Edison used a carbon filament. On 22 October 1879, Edison conducted his first successful test on the light bulb which lasted 13.5 hours.
By 4 November 1879, he filed for a US patent in the form of a US patent while improving the bulb design. Several months after the patent was granted, Edison and his team discovered that a carbonized bamboo fiber could last for more than 1,200 hours.
In Britain, the Edison and Swan Companies merged into the Edison and Swan United Electric Company, and in 1881 the Savoy Theater became the first public building in the world to be lit entirely by electric lights. Since then many changes were made in the design and size by various companies to bring efficiency.
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