Harmonics are periodic distortions of voltage, current, or electric power sine waves. Harmonics in power distribution devices tend to be caused by non-linear masses like switched manner dc electrical power materials and adjustable pace motor drives.XSMB - SXMB - K?t qu? x? s? mi?n B?c ???c t??ng thu?t tr?c ti?p t?t c? các ngày trong tu?n t? th?