Harmonics are periodic distortions of voltage, current, or electricity sine waves. Harmonics in energy distribution devices will often be due to non-linear hundreds like switched method dc energy materials and adjustable velocity motor drives.La Liga s? h?u nh?ng ??i bóng chuyên nghi?p, các tr?n ??u gi?a các ??i khi ra sân ??u th? hi?n s? bùn