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  1. . Một ampe met có giới hạn đo là 100mA. Điện trở của cơ cấu là 0,65  được mắc một RS có giá trị là 0,06  để mở rộng giới hạn đo. Thang đo có 100 vạch. Tìm dòng điện đo nếu kim chỉ 50 vạch ? Mắc RS  = ? để đo được dòng là 1A

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