Đường dây tải điện từ huyện về xã dài 10km có hđt 10000V truyền đi 1 dòng điện 200A .Dây dẫn bằng đồng cứ 1km có điện trở o,2 ôm .Tính : a) công suất hao phí do toả nhiệt trên đường dây. b)công suất hao phí đó co1 thể dùng thắp sáng bao nhiêu bóng đèn loại 100W. c)nếu hđt lên đến 30000V thì công suất hao phí giảm đi bao nhiêu lần.

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