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Physics, 10.11.2021 01:00 rachelsweeney10

một dây dẫn làm bằng vonfram có điện trở suất 5,5x10^-8 ômxmet . đường kính tiết diện 1mm và có chiều dài 5m , đặt dưới hiệu điện thế U=35V . nhiệt lượng toả ra trên dây trong thời gian 40 phút theo đơn vị jun và calo là bao nhiêu

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một dây dẫn làm bằng vonfram có điện trở suất 5,5x10^-8 ômxmet . đường kính tiết diện 1mm và có chiề...
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