c2: một nhà máy điện sinh ra một công suất 100000kW và cần truyền tải tới nơi tiêu thụ.biết hiệu xuất truyền tải là 95%. công suất hao phí trên đường truyền tải là bao nhiêu? c3: một máy biến thế dùng để hạ hiệu điện thế từ 220V. hỏi cuộn dây thứ cấp có bao nhiêu vòng, biết cuộn dây sơ cấp có 2200 vòng. c4: số vòng dây cuộn sơ cấp và cuộn thứ cấp của một máy biến thế lần lượt có 15000 vòng. nếu hiệu thế giữa hai đầu cuộn thứ cấp là 220V, thì hiệu điện thế giữa hai đầu cuộn sơ cặp là bao nhiêu ? c5: nếu đặt vào hai đầu của cuộn sơ cấp một hiện điệu thế xoay chiều thì bóng đèn mắc ở hai đầu cuộn thứ cấp có sáng lên không ? giải thích tại sao và cho biết hiệu điện thế xuất hiện ở cuộn thứ cấp là hiệu điện thế gì?

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