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hoanglien
2 năm trước
Bài 2. Đường dây tải điện dài 100Km, có hiệu điện thế hai đầu dây tải là 15000V. Dây tải có điện trở 0,2 ôm trên 1Km.Dòng điện truyền đi trên dây tải là 10A. tính công suất hao phí do tỏa nhiệt trên đường dây. Muốn công suất hao phí giảm đi 4 lần thì phải tăng hiệu điện thế lên bao nhiêu lần ?
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