Harmonics are periodic distortions of voltage, recent, or energy sine waves. Harmonics in power distribution methods are sometimes due to non-linear hundreds for example switched method dc electrical power provides and adjustable speed motor drives.Nguy?n Thùy Linh ??ng ?? nhi?u ??i th? duyên n? ? gi?i c?u lông Tây Ban Nha Bóng ?á Qu?c t? Mes