Você tem ideia para que serve aquele ”cilindro” no cabo do seu carregador?

Postado por , no dia 10 de novembro de 2016 em Sem categoria
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Geralmente ele se encontra próximo da extremidade da maioria dos cabos que temos no mercado.  Mas pra que mesmo serve isso? Esses cilindros são na verdade  “núcleos de ferrite”,  eles são responsáveis por evitar variações muito grandes e picos de energia nas correntes que passam por cabos, aumentando a chamada “indutância” dos fios. Tais cilindros foram inventados no século XIX pelo físico Mihajlo Pupin. Para o engenheiro eletricista da Poli-USP, Gustavo Bruno, “Eles ajudam a evitar que os cabos se comportem como antenas”. Ainda de acordo com o engenheiro Bruno, todo fio de metal pode servir como uma antena, absorvendo ou emitindo alguma radiação ao seu redor como resultado da corrente que passa por si próprio. Sem os tais núcleos, a radiação emitida pelos fios poderia ocasionar na interferência em outros objetos eletrônicos em seu redor, que por sua vez funcionariam como receptores dessa tal radiação, causando, por exemplo, aqueles famosos ruídos nas caixinhas de som. Interior do núcleo de ferrite EMI-Suppressor-Snap-on-Ferrite O núcleo é feito de discos ocos de ferrite, um material de óxido de ferro que possui propriedades magnéticas.

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