Harmonics are periodic distortions of voltage, latest, or electricity sine waves. Harmonics in electricity distribution techniques will often be caused by non-linear hundreds for example switched mode dc electric power supplies and adjustable pace motor drives.Tuy?n gi?a ??i tuy?n Vi?t Nam s?n sàng cho màn 'k?ch chi?n' v?i ??i th? Indonesia?Vi?c