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
All Over the World: The Very Best of Electric Light Orchestra All Over the World: The Very Best of Electric Light Orchestra All Over the World: The Very Best of Electric Light Orchestra is a compilation album by the Electric Light Orchestra, released in 2005. Originally released exclusively in the band's home market (the UK), the album sold very well, becoming the ELO's first Top Ten entry since Dino Record's compilation album "The Very Best of the Electric Light Orchestra" hit number 4 in 1994. "All Over the World" sold over 300,000 copies in the UK alone within a year and a half of its release. The albums "The Electric Light