Harmonics are periodic distortions of voltage, present-day, or power sine waves. Harmonics in energy distribution units in many cases are caused by non-linear loads like switched manner dc power supplies and adjustable pace motor drives.Tây Ban Nha Pau Cubarsi, ? 17 tu?i 50 ngày, tr? thành c?u th? tr? nh?t ra m?t trong m?t tr?n thu?c vòng lo?i