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zimie2210
2 năm trước
Thông số ghi trên nhãn máy của máy biến áp một pha như sau: S = 25 kVA, U = 380V, U = 127V. a/ Tính dòng điện định mức cuộn sơ cấp và thứ cấp của máy biến áp? b/ Tính điện áp cuộn thứ cấp khi điện áp đặt vào cuộn sơ cấp bằng 70% U ? c/ Khi đặt nguồn vào cuộn thứ cấp bằng U , hãy tính điện áp trên cuộn sơ cấp? Giúp mn ơi
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