Electric light be made with a screw-thread base, two metal pins, two metal caps or a bayonet cap. The three main categories of electric lights are incandescent lamps, which produce light by a filament heated white-hot by electric current, gas-discharge lamps, which produce light by means of an electric arc through a gas, and LED lamps, which produce light by a flow of electrons across a band gap in a semiconductor. Before electric lighting became common in the early 20th century, people used candles, gas lights, oil lamps, and fires. Cornish chemist Humphry Davy developed the first incandescent light in 1802, followed
Electric light heat lamps in fast food restaurants and toys such as the Easy-Bake Oven. Tungsten filament lamps have long been used as fast-acting thermistors in electronic circuits. Popular uses have included: A stylized depiction of a light bulb features as the logo of the Turkish AK Party. In circuit diagrams lamps usually are shown as symbols. There are two main types of symbols, these are: Electric light An electric light is a device that produces visible light from electric current. It is the most common form of artificial lighting and is essential to modern society, providing interior lighting for buildings and