It is generally believed that the electric light was invented by Thomas Edison, an American. 180 1 year, the British chemist David electrified the platinum wire to glow. He also invented the electric candle in 18 10, which was illuminated by an arc between two carbon rods. 1854, Henry Goebbels put a carbonized bamboo filament under a vacuum glass bottle to make it glow. Today, his invention seems to be the first incandescent lamp with practical value. The light bulb he tested at that time could last for 400 hours, but he didn't apply for the design patent in time.
1850, the Englishman Joseph Wilson Swan began to study electric lights. 1878, he obtained a British patent for a light bulb powered by carbon wire under vacuum, and started to set up a company in Britain to install electric lights in every household. 1874, two Canadian electrical technicians applied for a patent for electric lamps. They filled the glass bulb with nitrogen, and the electrified carbon rod made it glow. But they didn't have enough money to continue developing this invention, so they sold the patent to Edison on 1875.
Edison's greatest discovery was that tungsten was used as the filament instead of carbon. Later, in 1906, General Electric invented the manufacturing method of tungsten wire for electric lamps. Finally, the method of manufacturing tungsten filament at a low price was solved, and the tungsten filament bulb has been used ever since.
The biggest problem of light bulb is the sublimation of filament. The life of modern incandescent lamps is generally about 1000 hours.