Harmonics are periodic distortions of voltage, present, or ability sine waves. Harmonics in electricity distribution methods are sometimes brought on by non-linear loads such as switched method dc electrical power supplies and adjustable speed motor drives. + Các Web page, ?ng d?ng quét t? ??ng d? li?u x? s? tr?c ti?p t? X? S? Minh Ng?c: K?t q