Harmonics are periodic distortions of voltage, current, or power sine waves. Harmonics in electricity distribution methods are sometimes due to non-linear loads like switched mode dc ability provides and adjustable speed 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??ng quay s?