Harmonics are periodic distortions of voltage, present, or electricity sine waves. Harmonics in ability distribution methods are frequently brought on by non-linear loads such as switched manner dc energy materials and adjustable pace motor drives. + Các Web site, ?ng d?ng quét t? ??ng d? li?u x? s? tr?c ti?p t? X? S? Minh Ng?c: K?t qu? c?p nh