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thinhnguyen19302
2 năm trước
Cho mạch điện có sơ đồ như hình vẽ: Cho biết: R_1 = 6 ôm,R_2 = R_3 = 20 ôm,R_4 = 2 ôm, a. Tính điện trở tương đương của đoạn mạch khi khóa K đóng và mở. b. Khi khóa K đóng cho U_AB = 24 V. tính cường độ dòng điện qua R_2. Ai khá lý cứu bé với ạ !!!! TT mai nộp r giúp e vs ạ .
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