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lightbulb
The role of chemistry in Thomas Edison's inventions
lightbulb lightbulb: Ediswan Thomas Edison sodium-vapour lamp bulb incandescent lightbulb
Know how halogen and fluorescent bulbs, as well as sodium, mercury, and metal-halide vapour lamps, and LEDs work
How does electrical resistance affect a circuit?
Quizzes
(Left) Ball of predictions with answers to questions based on the Magic 8 Ball; (right): Rubik's Cube. (toys)
The Dating Game: Which Came First?
Read Next
A Factory Interior, watercolor, pen and gray ink, graphite, and white goache on wove paper by unknown artist, c. 1871-91; in the Yale Center for British Art. Industrial Revolution England
Inventors and Inventions of the Industrial Revolution
Discover
Title: Senate Square, St. Petersburg, December 14, 1825: repression of the troop mutiny - watercolor by Carl Ivanovitch Kollman, 1825 depicts Decembrist uprising clashing with cavalry, with spectators watching. (new style December 26, 1825) Europe. Saint
8 of the Largest Empires in History
A human Inuit skull in a stone chambered cairn in Ilulissat in Greenland. These ancient graves are pre christian and are at least 2000
14 Tough Questions Answered
Diverse elementary school children wearing school uniforms running outside of school. Boys girls
Pro and Con: School Uniforms
Baseball laying in the grass. Homepage blog 2010, arts and entertainment, history and society, sports and games athletics
10 Greatest Baseball Players of All Time
Leonardo da Vinci (1452-1519), Italian Renaissance painter from Florence. Engraving by Cosomo Colombini (d. 1812) after a Leonardo self portrait. Ca. 1500.
10 Famous Artworks by Leonardo da Vinci
Santa Claus flying in his sleigh, christmas, reindeer
Was Santa Claus a Real Person?
Iraqi Army Soldiers from the 9th Mechanized Division learning to operate and maintain M1A1 Abrams Main Battle Tanks at Besmaya Combat Training Center, Baghdad, Iraq, 2011. Military training. Iraq war. U.S. Army
8 Deadliest Wars of the 21st Century

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Videos

The role of chemistry in Thomas Edison's inventions
How Thomas Edison changed the world.
Video: © American Chemical Society (A Britannica Publishing Partner)
Know how halogen and fluorescent bulbs, as well as sodium, mercury, and metal-halide vapour lamps, and LEDs work
Learn how halogen bulbs, fluorescent bulbs, sodium vapour lamps, mercury vapour lamps,...
Video: © MinutePhysics (A Britannica Publishing Partner)
How does electrical resistance affect a circuit?
In every electric circuit there is some resistance to the flow of electric current,...
Video: Encyclopædia Britannica, Inc.

Images

lightbulb
A 3.4-watt lightbulb developed by Lemnis Lighting.
PRNewsFoto/Lemnis Lighting/AP Images
lightbulb
Lightbulb.
KMJ
lightbulb: Ediswan
Advertisement for Ediswan incandescent lightbulbs, 1898.
© Photos.com/Thinkstock
Thomas Edison
Thomas Edison, 1925, holding a replica of the first electric lightbulb.
Mondadori Portfolio/age fotostock
sodium-vapour lamp bulb
High-pressure sodium-vapour lamp bulb.
(Top and centre) W.H. Rhodes and G.C. Wei in R.W. Cahn and M.B. Bever (eds.), Encyclopedia of Materials Science and Engineering, Supplementary Vol. 3, © 1993 Pergamon Press; (bottom) General Electric Company
incandescent lightbulb
A glowing incandescent lightbulb.
© Pulsar75/Shutterstock.com
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