Harmonics are periodic distortions of voltage, existing, or ability sine waves. Harmonics in energy distribution programs are sometimes a result of non-linear loads such as switched method dc ability materials and adjustable pace motor drives.??i tr??ng ?? Hùng D?ng kh?ng ??nh anh và ??ng ??i mu?n ch?i m?t tr?n s?ng còn v?i Indonesia ngày 26/3