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Quando uma corrente elétrica muito intensa passa por esse fio de cobre, os elétrons colidem com os átomos do metal e transformam energia elétrica em calor. Esse fenômeno é chamado de efeito Joule. À medida que a temperatura sobe, o cobre começa a emitir luz. Não é uma chama. É o próprio metal ficando incandescente. Se a corrente continuar aumentando, a temperatura pode ultrapassar o ponto de fusão do cobre e o fio simplesmente derrete. É exatamente esse princípio que explica o funcionamento de
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tome cuidado ao pegar em fios que estejam conduzindo corrente elétrica! essa analogia é bem interessante pra vocês aprenderem.
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