Sábado, Junho 09, 2007

Eletricidade sem fio?

Acaba de ser noticiado que no futuro a eletricidade poderá chegar aos consumidores finais, sem fio, sem conexão a tomadas.
A conclusão foi obtida por um grupo de pesquisa nos EUA e anunciada por André Kurs, físico brasileiro, primeiro autor do estudo publicado no site da revista "Science" (www.sciencexpress.org). "Usamos simples bobinas de cobre, não foi preciso nenhum material exótico", diz o físico brasileiro André Kurs. Kurs está fazendo doutorado no MIT (Instituto de Tecnologia de Massachusetts), sob orientação de Marin Soljacic, que também assina o estudo.

O sistema apresentado tem como grande vantagem não afetar o ser humano, uma vez que não irradia para o meio-ambiente ondas eletromagnéticas como a luz ou as ondas de rádio. Isto ocorre porque a energia é feita por meio de um magnetismo não irradiante, conseguido através da aproximação de duas bobinas de cobre. Em decorrência disso, a interação com o resto do ambiente é muito fraca. Os pesquisadores afirmam que se colocaram entre as duas bobinas, sendo que o resultado da experiência não foi alterado, ou seja, uma lâmpada utilizada continuou acesa.
O grupo de pesquisadores anunciou que conseguiu transmitir 60 watts de potência elétrica com cerca de 40% de eficiência, até uma distância de aproximadamente 2 metros.
O método tradicional de transmitir informação sem fio, através de ondas eletromagnéticas, como as ondas de rádio, não se presta para enviar energia elétrica, devido ao fato de que a radiação se espalha em todas as direções e a maior parte da eletricidade se perderia no ambiente.



  • Pô, mas o Nicola Tesla já queria fazer isso tem mais de século! Só que o Thomas Edison acabou levando a melhor na briga.

    By Blogger CrisDias, at 14/6/07 22:28  

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