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ct.rin.zin04
2 năm trước
Cần siêuuuu gấp ạ Một biến trở con chạy được làm bằng sắt, có tiết diện đều 0,5mm2 , p = 12.10^-8m , gồm 1000 vòng quấn quanh lõi sứ trụ tròn có đường kính là 4cm a) Tính điện trở cực đại của biến trở b) Tính Cường độ dòng điện định mức của biến trở. Biết Hiệu điện thế lớn nhất được phép đặt vào 2 đầu dây biến trở là 75 V Tóm tắt luôn ạ
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