The filament bulbs are a common type of light bulbs. It contains a thin coil of wire called the filament. This heats up when an electric current passes through it and produces light as a result.
Incandescent light bulbs have filaments which are made mainly from the element tungsten, the metal element used for the filaments in incandescent light bulbs.
See also: Types of bulbs
Experiments were made with different materials to use as the filament, including natural fibres, pure metals and alloys of different metals, to find the material which had the longest life whilst glowing brightly enough to give out visible light. The metal Tungsten was found to be the best, because of its high melting point (almost 3700 K) and good resistance to electrical current.
Incandescent lamps (ones that make light of making heat) are getting something of a bad press these days because they waste so much energy, but they’ve longed been considered among the greatest inventions of all time and a burning bright light the bulb is still widely used as the symbol of a great idea. Let’s take a look at these marvels of technology and find out how they work!
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