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17 April 2014 12:48 pm ,
Vol. 344 ,
Officials last week revealed that the U.S. contribution to ITER could cost $3.9 billion by 2034—roughly four times the...
An experimental hepatitis B drug that looked safe in animal trials tragically killed five of 15 patients in 1993. Now,...
Using the two high-quality genomes that exist for Neandertals and Denisovans, researchers find clues to gene activity...
A new report from the Intergovernmental Panel on Climate Change (IPCC) concludes that humanity has done little to slow...
Astronomers have discovered an Earth-sized planet in the habitable zone of a red dwarf—a star cooler than the sun—500...
Three years ago, Jennifer Francis of Rutgers University proposed that a warming Arctic was altering the behavior of the...
- 17 April 2014 12:48 pm , Vol. 344 , #6181
- About Us
His Invention Is Still Current
9 July 1997 7:00 pm
Nikola Tesla, a Croatian-American physicist and engineer who pioneered the use of alternating current electricity, was born at the stroke of midnight on this day in 1856. Believing he could improve upon a direct-current electric dynamo, Tesla designed and built the first alternating current induction motor in 1883. It was comprised of an iron rotor spinning between stationary coils electrified by two out-of-phase alternating currents, which produced a rotating magnetic field.
Alternating current could be transmitted over greater distances than direct current, a fact that in 1893 persuaded George Westinghouse to buy Tesla's patents and use the system at Niagara Falls to power the city of Buffalo. Most of today's electric machines run on alternating current. Tesla is also known for the Tesla coil, a transformer he designed to produce high-frequency, high-voltage electricity.
[Source: Roy Porter, Ed., The Biographical Dictionary of Scientists (Oxford University Press, ed. 2, 1994).]