Monday, January 19, 2015

How stuff work series Lights




The invention of the light bulb greatly impacted the way we live. It created longer work weeks, helped make the principle of fiber optics possible, and stopped fires caused y the notorious oil lamp and candle.

The interaction between a metal, tungsten and electricity help make the invention of the lightbulb possible. In the filament, which is an illuminating wire inside the bulb is made out of tungsten. The bulb's purpose is to  protect the tungsten from burning by keeping oxygen, vital for combustion out of the bulb and trap the argon from escaping. Since the argon cannot combine with tungsten to burn, the filament glows brightly when electricity is sent through the tungsten filament. The tungsten wire is very thin and it acts as a resistor because the electricity is like 20,000 gallons of water and the wire is a 1/2 inch pipe in which the water gets propelled through. Since resistance is like friction, the wire heats up and if it becomes hot enough it glows.  The term incandescence is when an objects temperature is so high that it emits light, thus the term incandescent.

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