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, recent, or energy sine waves. Harmonics in electricity distribution devices are frequently attributable to non-linear loads like switched manner dc ability provides and adjustable pace motor drives.??i v?i nh?ng ng??i ch