Who invented the electric light?
Electric light, that is, artificial lighting appliances with electricity as energy source, can convert electricity into light. Common types of electric lamps include incandescent lamps, fluorescent lamps and LED lamps. Electric light has changed the world and people's lives. This is one of the greatest inventions of modern mankind. The earliest practical electric lamp was incandescent lamp, but before the birth of incandescent lamp, the Englishman Humphrey David made arc lamp with 2000 batteries and two carbon rods. 1854, Henry Goldbert, a German watchmaker who immigrated to the United States, made the first practical electric lamp in a vacuum glass bottle with a carbonized bamboo wire, which lasted for 400 hours, but he did not apply for a patent in time.
1874, two electrical technicians in Canada applied for a patent for electric light: nitrogen was filled under a glass bulb and charged carbon rods were used to emit light, but they did not have enough financial resources to continue to improve this invention, so they sold the patent to Edison in 1875. Edison tried to improve the filament after purchasing the patent, and finally made a carbonized bamboo filament lamp that could last for 1200 hours in 1880.