Harmonics are periodic distortions of voltage, existing, or power sine waves. Harmonics in electricity distribution programs in many cases are brought on by non-linear masses like switched manner dc electric power supplies and adjustable speed 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 q