Harmonics are periodic distortions of voltage, existing, or energy sine waves. Harmonics in energy distribution methods will often be due to non-linear hundreds such as switched mode dc electricity provides and adjustable velocity motor drives.K?t qu? x? s? mi?n B?c trên m?ng c?ng s? ???c c?p nh?t ngay vào lúc 18h15 h?ng ngày b?i t?i các tr??n