Harmonics are periodic distortions of voltage, existing, or electric power sine waves. Harmonics in electrical power distribution units will often be due to non-linear hundreds for instance switched manner dc ability provides and adjustable speed motor drives.V?i t? l? th?ng c?c k? t??i sáng, m?i l?n tham gia, ng??i ch?i có c? h?i tr? thành ng??