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nguyenthoa02092001
2 năm trước
Một máy biến thế có số vòng dây cuộn thứ cấp gấp 3 lần số vòng dây cuộn sơ cấp thì hiệu điện thế ở hai đầu cuộn thứ cấp so với hiệu điện thế ở hai đầu cuộn sơ cấp sẽ A: tăng 3 lần. B: Tăng 6 lần. C: giảm 3 lần. D: Giảm 6 lần.
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