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act as electrodes airlT amount of current animal fat Arc Lamps argon atoms bright and hot brighter light burn gas burning coal candles Caution chemical called coal gas coil of thin crude oil device Discover Fire earth elec electric charge electric current electric light energy creates heat energy that produces ergy filament filled with neon flame Flashlights flint stones flow of electrons form of light fueled with oil Gas lanterns gases glowing with heat Halogen Lamps high temperatures homes incandescent lamp jector Kerosene Lamps lamp became laser beam lDEA lemon light bulb light produced liquid machine that produces mercury vapor natural gas Nature's Light Nuclear energy creates Nyncke pencil leads petroleum power stations produced naturally produces electricity produces light reflectors steam Stone Age streetlamps Sun Gives switches thin wire torch tricity trons tube filled Tungsten Turbines turned type of metal ultraviolet light rays uranium wick wood wooden sticks