Harmonics are periodic distortions of voltage, latest, or ability sine waves. Harmonics in electric power distribution devices tend to be caused by non-linear masses such as switched method dc energy supplies and adjustable velocity motor drives.16 ??i bóng hàng ??u t?i Vi?t Nam h?a h?n s? mang ??n nh?ng tr?n c?u h?p d?n nh?t cho ng??i hâm m? n?