Physics, 29.07.2021 22:30 mckennayoshz

Một dây dẫn dài 100m ,tiết diện 2mm2 có điện trở 12 ôm. Tìm chiều dài của 1 dây đồng chất khác có tiết diện S2=0.4mm2 có điện trở gấp 5 lần điện trở dây 1

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Một dây dẫn dài 100m ,tiết diện 2mm2 có điện trở 12 ôm. Tìm chiều dài của 1 dây đồng chất khác có ti...

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