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maivy561
2 năm trước
B2. Cường độ dòng điện chạy qua một dây dẫn là 1,2A khi được mắc vào hiệu điện thế 48V. a. Muốn dòng điện chạy qua dây dẫn đó tăng lên 2 lần thì phải đặt hiệu điện thế là bao nhiêu ? b. Muốn hiệu điện thế đặt vào hai đầu dây dẫn đó giảm đi 4V thì cường độ dòng điện chạy qua là bao nhiêu ?
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