Harmonics are periodic distortions of voltage, current, or power sine waves. Harmonics in energy distribution methods will often be brought on by non-linear masses for instance switched manner dc electricity materials and adjustable velocity 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?