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lolychen
2 năm trước
R1=R2= 20 ôm. Nếu đang mắc R1 // R2 chuyển sang mắc R1 nối tiếp R2 vào cùng một hiệu điện thế U thì cường độ dòng điện qua mạch chính sẽ thay đổi : 1 điểm A Tăng 4 lần B Giảm 4 lần C Tăng 2 lần D Giảm 2 lần
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