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)Harmonics are periodic distortions of voltage, current, or electrical power sine waves. Harmonics in electricity distribution programs will often be a result of non-linear hundreds for instance switched method dc ability provides and adjustable velocity motor drives.