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vungoc2013
2 năm trước
Giải ngắn gọn nhưng đầy đủ giúp mình nha Cho mạch điện gồm R1 // (R2 nt A2) nt Ampe kế A Biết R1 = 20 ôm A = 4A A2 = 2,2A a) Xác định hiệu điện thế giữa 2 đầu đoạn mạch và giá trị điện trở R2? b) Giữ nguyên hiệu điện thế giữa 2 đầu đoạn mạch, thay R1 = R3 thì thấy ampe kế A chỉ 5,2 A Số chỉ Ampe kế A2 khi đó là bao nhiêu? Tính R3?
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