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nguyenminhhieu06072004
2 năm trước
Một mạch điện gồm hai điện trở R1 và R2 mắc song song với nhau. Khi mắc vào một hiệu điện thế U thì cường độ dòng điện chạy qua mạch chính là: I = 1,2 A và cường độ dòng điện chạy qua R2 là I2 = 0,5 A. Vậy cường độ dòng điện chạy qua R1 bằng bao nhiêu? I1 = 0,7 A. I1 = 0,8 A. I1 = 0,6 A. I1 = 0,8 A.
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