How+does+a+light+bulb+work?+Part+3


 * How does a Light Bulb Work? **

** By Emma Z. 2011 **
 * Incandescent light **
 * **The **** incandescent light is one of the many types of light ****s. [[image:incandescent-light-bulb.[1].jpg width="121" height="111" caption="Incandescent Light bulb"]] **
 * **It has a thin, curly wire call ****ed a filament. **
 * **When el ****ectricity flows through the wire it h ****eats up and gives off light ****. **
 * **The glass part of the light is called the bulb. It keeps the air away so the filament won’t burn out for a w ****hile. **


 * Fluorescent light or energy saving light **
 * **A fluorescent light uses [[image:fluorecent-light-bulb[1].jpg width="106" height="106" align="right" caption="Fluorescent Light bulb"]]70% less energy than an incandescent light. **
 * **It can last for up to 10 years. **
 * **The base **** fills up with electricity. **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">The electrodes produce a stable flow of electrons inside the pipes. **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">The electrodes go and cooperate with the mercury gas, giving off a UV light. **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Visible light comes when the UV light passes through the phosphor outer covering. **


 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Electrical Discharge Light **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">In an electric discharge light, the light glows when a current motivates the gas until it finally gives of a white heat. **


 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Visible Light **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Visible light is created when excited atoms calm down and go to their normal, unexcited self. **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Visible light’s speed was first calculated in 1676 by the astronomer Olaus Roemer. He was Danish.[[image:spectrum[1].jpg width="266" height="105" caption="Visible Light Spectrum"]] **

<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">
 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Ultra – Violet light **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Ultra-violet light is another type of light. Long contact with this light can give you a suntan **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">They first realized the effect of the UV light in 1801. **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">They just recently discovered what the effect of UV light has done on living things. **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">You can get vitamin D from the sun, which is UV light. **
 * **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">You can also get skin cancer from too much of short – wavelength UV radiation. **


 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Glossary: **
 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Mercury – **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">a silvery metal that is a liquid
 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Phosphor – **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">metal compounds or earth compounds of various types
 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Electrodes **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">– a conductor that electricity enters or leaves an object
 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Conductor **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;"> – something that allows electricity to pass through
 * <span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">Electrons – **<span style="font-family: 'Times New Roman','serif'; font-size: 18.6667px;">a particle with negative energy that is in all atoms





**<span style="font-family: 'Times New Roman','serif';">Woodford, Chris. Cool stuff and how it works. London: DK, 2005. Print. **


 * Electricity and Magnetism: Current Electricity. Prod. Colgren Communications. Colgren Communications, 2004. Discovery Education. Web. 22 September 2011. <http://www.discoveryeducation.com/>.**


 * "radiation." Compton's by Britannica. Encyclopedia Britannica Online School Edition.**
 * Encyclopedia Britannica, Inc., 2011. Web. 22 Sept. 2011.**
 * <http://school.eb.com/comptons/article-207070>.**