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Incandescent Light Featuring Louie the Lightning Bug

Incandescent Light Featuring Louie the Lightning Bug. Melissa Long Allison M c Coy Junior Lab December 10, 2003. History of the Light Bulb. 70,000 BC - first lamp invented. 1809 -  Humphry Davy, an English chemist, invented the first electric light.

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Incandescent Light Featuring Louie the Lightning Bug

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  1. Incandescent LightFeaturing Louie the Lightning Bug Melissa Long Allison McCoy Junior Lab December 10, 2003

  2. History of the Light Bulb • 70,000 BC - first lamp invented. • 1809 -  Humphry Davy, an English chemist, invented the first electric light. • 1854 - Henricg Globel, a German watchmaker, invented the first true light bulb. • 1875 - Henry Woodward and Matthew Evans patented the light bulb. • 1879 - Thomas Alva Edison invented first successful incandescent light bulb • 1907 - Tungsten was first used for light bulb filaments

  3. Blackbody Radiation • The spectrum of a blackbody depends only on the temperature of the object. • Incandescent Lights give off blackbody radiation.

  4. Incandescent Light • Electric current passes through metallic filament • Filament heats producing visible light • Filament enclosed in evacuated glass bulb or a bulb containing an inert gas • http://www.bulbs.com/lightingguide/tech_incandescentdiagram.asp

  5. Halogen Lamp • Step 1: Tungsten atoms evaporate from the hot filament and move toward the cooler bulb-wall. • Step 2: Tungsten, oxygen and halogen atoms combine at the bulb-wall to form tungsten oxyhalide molecules. • Step 3: The bulb-wall temperature keeps the tungsten oxyhalide molecules in a vapor. The molecules move toward the hot filament where the higher temperature breaks them apart. • Step 4: Tungsten atoms are re-deposited on the cooler regions of the filament. W(s) + 3Cl2(g) WCl6(s) WCl6(s)  W(s) + 3Cl2(g) heat • http://americanhistory.si.edu/lighting/tech/th.htm • http://www.webelements.com/webelements/elements/text/W/chem.html

  6. Wavelength of Our Light Sources

  7. Louie The Lightning Bug brought to you by CIPCO’s Electric Universe:The Power of Learning (http://cipco.electricuniverse.com/html/index.html) • zebu.uoregon.edu/~imamura/ 123/lecture-1/cmbr.html • http://inventors.about.com/library/inventors/bllight.htm • http://americanhistory.si.edu/lighting/tech.htm • http://www.bulbs.com/lightingguide/tech_incandescentdiagram.asp • http://www.webelements.com/webelements/elements/text/W/chem.html

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