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tunganhhoang34
2 năm trước
Cho mạch điện như hình vẽ nguồn có HĐT U=3V, r=0,4 ôm, R1=1 ôm, R3=2 ôm, R4=4 ôm, ampe kế có điện trở ko đáng kể. Biết khi K ngắt ampe kế chỉ 0,2A, khi K đóng ampe kế chỉ 0. Tính A, R2 và R5 B, công suất của nguồn trong 2 TH
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