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A sensação de “toque” parece simples, mas por trás dela existe um fenômeno físico surpreendente. Tudo ao nosso redor é feito de átomos, e cada átomo possui um núcleo cercado por elétrons. Esses elétrons formam uma espécie de nuvem ao redor do núcleo. Quando você encosta a mão em um objeto, na verdade as nuvens de elétrons da sua mão e do objeto começam a interagir antes que qualquer contato real entre núcleos aconteça.
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De onde vem tantos eletrons? Eles nunca acabam? Os geradores criam novos elétrons? Quando uma usina gera a energia elétrica alternada, por exemplo, ela não cria elétrons. Ela só gera uma energia potencial que impulsiona os elétrons livres que já existem nos circuitos. Em um sistema que funciona com corrente alternada, os elétrons ficam indo para frente e para tras o tempo inteiro, fazendo com que as coisas funcionem. Em outras palavras, são os próprios elétrons existentes nos fios e component
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