Harmonics are periodic distortions of voltage, existing, or electricity sine waves. Harmonics in energy distribution devices are sometimes caused by non-linear hundreds for example switched mode dc electric power materials and adjustable pace motor drives.Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u ch?nh)123B’s paym