![]() Eventually the filament gets so hot that it glows, producing light. The resistance of the filament heats the bulb. ![]() Electrical filaments are made up mostly of tungsten metal. The incandescent light bulb turns electricity into light by sending the electric current through a thin wire called a filament. A light bulb that produces more light and less heat is more efficient. Except for heat lamps, the heat is considered waste. Light bulbs convert electricity into light and heat.
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