THE
INCANDSCENT
LIGHTBULB
Keeping the World AWAKE
GRACE WIJAYA
INCANDESCENT LIGHT BULB: AN ELECTRIC LIGHT WHERE
FILAMENT IS HEATED TO INCANDESENCE THROUGH AN
ELECTRIC CURRENT.
The invention of the light bulb is credited
to Joseph W Swan and Thomas A Edison.
Almost 90% of the power used by an
incandescent light bulb is emitted as heat,
rather than visible light
Ne
Fe
SiO2
Ni
Kr
Mo
Ar
W
N
Ar
GLASS BULB SILICA
•Glass is mostly made of Silicon Dioxide
(SiO2)
•Found in the form of sand or quartz
•Most plentiful mineral found throughout
the Earth’s Lithosphere, including Canada
SiO2
Mo
SUPPORT WIRES MOLYBDENUM
•Known for its ability to withstand
extreme temperatures
•Found in aircraft parts, electrical
contacts, etc.
•Commonly found in the United States,
China, Chile, Peru, and Canada in
minerals such as wulfenite and gowelite
FILAMENT TUNGSTEN
W
•Replaced previous filaments made
of carbon
•Known for its robust physical
properties – highest melting point
amongst non-alloyed metals
•Found in the minerals wolfamite,
maganese tungstate, etc.
•Over 35000 tons of tungsten
concentrates mined per year
•China mines 75% followed by
Austria, Bolivia, Portugal, and Russia
Fe Ni
CONTACT WIRES NICKEL, IRON
•Nickel and Iron alloy believed to be a
large portion of Earth’s Core
•Nickel is mainly mined in the Sudbury
region in Canada, New Caledonia, and
Norilsk in Russia
•Iron ore is mostly mined in the US,
Eastern Canada, Brazil, and Australia
CAP ALLUMINUM ALLOY
•Alloys known for their strength, workability,
weldability, corrosion resistance, and ductility
etc
•Used extensively in modern aircraft – great
strength to weight ratio
•Found mainly in Australia, China, Brazil,
India, Guinean, Jamaica, Russia etc.
Al
RESOURCES:
http://typesoflightbulbs.com/images/Incandescent_Light_Bulb.png
http://www.howstuffworks.com/light-bulb.htm
http://www.answers.com/topic/incandescent-light-bulb
http://www.apartmenttherapy.com/uimages/dc/light-bulb.gif
http://www.webresourcesdepot.com/wp-content/uploads/image/free-vector-worldmap.gif
http://mirror-us-ga1.gallery.hd.org/_exhibits/light/_more2003/_more05/light-bulbglowing-filament-light-blue-uncropped-3-AHD.jpg
http://en.wikipedia.org
http://shadow.eas.gatech.edu/~kcobb/energy/earth_at_the_night_1024x768.jpg
Today, incandescent light bulbs are being replaced by fluorescent light
bulbs, and LEDs for more energy efficient lighting, however, it is important
to keep in mind that this was the light bulb that initially brought the
common population out of the darkness during the night, a constant source
of dependable light. THANKS FOR VIEWING!