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hungsaker23
2 năm trước
Một biến trở con chạy có ghi (20Ω – 2A). Dây dẫn làm biến trở trên bằng chất có điện trở suất 0,6.$10^{-6}$Ωm, có tiết diện 0,3$mm^{2}$. – Tính chiều dài dây dẫn làm biến trở. – Mắc biến trở trên nối tiếp với đèn (6V – 2,4W) vào hiệu điện thế 9V không đổi. Di chuyển con chạy trên biến trở để đèn sáng bình thường. Tìm điện trở của biến trở đã tham gia vào mạch. (Tóm tắt ra nữa nha-.-)
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