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phamquynhanh2009lx
2 năm trước
Khi mắc R1 và R2 nối tiếp với nhau vào một hiệu điện thế U. Hiệu điện thế giữa hai đầu mỗi điện trở: U1= 2,5V, U2=3,5V. Thì hiệu điện thế giữa hai đầu đoạn mạch U bằng: A, 6A B, 5V C, 6V D, 1V
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