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Otterman speaks...

Cycling, macintosh, natural history and life in Singapore - Archives

List of Categories : travel * museum * cycling * Singapore Naturalist * science * kakis * mangroves * movies * mac and the internet * meow * NUS * life in Singapore * lit * world *

Sat 09 Jun 2007

Wireless power transfer

Category : science

"Wireless Power Transfer via Strongly Coupled Magnetic Resonances," by Kurs et al., 2007. Science DOI: 10.1126/science.1143254 (Published online in Science Express, 07 June 2007).

"Using self-resonant coils in a strongly coupled regime, we experimentally demonstrate efficient non-radiative power transfer over distances of up to eight times the radius of the coils. We demonstrate the ability to transfer 60W with approximately 40% efficiency over distances in excess of two meters. We present a quantitative model describing the power transfer which matches the experimental results to within 5%. We discuss practical applicability and suggest directions for further studies."

Hat tip - Science Blog.

If this sounds familiar, it could be because you watched The Prestige (2006) in which wireless power transfer is illustrated. The character referrred to as Nikola Tesla is actually a real person.

Read this letter, "Transmission Of Electric Energy Without Wires," by Nikola Tesla. Electrical World and Engineer, March 5, 1904, hosted at the PBS webpage, "Tesla - Master of Lightning". See also the section on his work at Colorado Springs. This is where he is sought out in the film, and stalked by Edison's men!

"One question has never been definitively answered: Did Tesla actually transmit wireless power at Pikes Peak?"

Credited with the invention of the radio amongst many other things, accounts about him that I read after watching the movie overshadow Edison, his contemporary and rival. But I probably first only heard of him unknowingly in Sec 2 or 3 when learning about magnetic flux density; the unit tesla, was named in his honour.

Wikipedia has this to say,

"Nikola Tesla (10 July 1856 - 7 January 1943) was an inventor, physicist, mechanical engineer and electrical engineer. Tesla is best known for his many revolutionary contributions to the discipline of electricity and magnetism in the late 19th and early 20th century. Tesla's patents and theoretical work formed the basis of modern alternating current electric power (AC) systems, including the polyphase power distribution systems and the AC motor, with which he helped usher in the Second Industrial Revolution.

After his demonstration of wireless communication in 1893 and after being the victor in the "War of Currents", he was widely respected as America's greatest electrical engineer. Much of his early work pioneered modern electrical engineering and many of his discoveries were of groundbreaking importance. In the United States, Tesla's fame rivaled that of any other inventor or scientist in history or popular culture, but due to his eccentric personality and, at the time, unbelievable and sometimes bizarre claims about possible scientific and technological developments, Tesla was ultimately ostracized and regarded as a mad scientist. Never putting much focus on his finances, Tesla died impoverished at the age of 86.

Aside from his work on electromagnetism and engineering, Tesla is said to have contributed in varying degrees to the establishment of robotics, remote control, radar and computer science and to the expansion of ballistics, nuclear physics and theoretical physics. In 1943, the Supreme Court of the United States credited him as being the inventor of the radio. Many of his achievements have been used, with some controversy, to support various pseudosciences, UFO theories and new age occultism. Contemporary researchers of Tesla have deemed him "the man who invented the twentieth century" and "the patron saint of modern electricity.""

Read the "Life and Legacy" pages on the PBS website and see also "Wireless Electricity? Tesla would be proud," by George Gardner, Tech.Blorge, 08 Jun 2007.

Posted at 1:39AM UTC by N. Sivasothi | permalink | , .