Filament, high temperature resistant metal wires in bulbs or electronic tubes are mostly fine tungsten wires, but also iridium or their alloys. When powered on, they can directly emit light and heat, or emit electrons, ultraviolet rays, form high-energy electric fields or high-energy rays and other exciting fluorescent substances, rare gases or form plasmas to generate visible light of various colors.The earliest incandescent filament was invented by Edison.After power on, the pure resistance electrical appliances that convert electric energy into internal energy and then into light energy are mainly converted into light energy.
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