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thanhteim
2 năm trước
giúp với ạ Cho mạch điện như hình vẽ bên. Biết R1 = 12Ω, R2 = 8Ω, R3 = 16Ω. Hiệu điện thế giữa hai đầu đoạn mạch là U = 48V. a. Cho RX = 14Ω. Tính điện trở tương đương của đoạn mạch và cường độ dòng điện trong mạch chính. b. Xác định RX để cường độ dòng điện qua RX nhỏ hơn 3 lần so với cường độ dòng điện qua điện trở R1.
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