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leuyenphuong250801
2 năm trước
Giúp mình với Người ta dùng 1 máy biến thế có cuộn sơ cấp 8000 vòng, cuộn thứ cấp có 200 vòng mắc vào mach điện xoay chiều thì thu được hiệu điện thế ở 2 đầu cuộn thưa cấp là 220V. a) Máy biến thế trên là máy tăng thếhay hạ thế? Giải thích. b) Máy này được đặt ở vị trí nào trên đường dây tải điện? c) Tính hiệu điện thế đặt vào 2 đầu cuộn sơ cấp.
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