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tranhaiminhqaz
2 năm trước
Một máy biếng thế có cuộn sơ cấp là 3300 vòng cuộn thứ cấp là 150 vòng a máy biến thế đó tăng hay hạ thế vì sao b khi đặt vào hai đầu cuộn dây sơ cấp một hiệu điện thế xoay chiều 220V thì ơn hai đầu cuộn dây thứ cấp có hiệu điện thế là bao nhiêu
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