Harmonics are periodic distortions of voltage, recent, or energy sine waves. Harmonics in electric power distribution units are often attributable to non-linear masses for example switched method dc ability supplies and adjustable speed motor drives.Tin t?c Vinmec ra m?t VinCare PRIMÉ - mô hình qu?n lý s?c kh?e cho gi?i th??ng l?u Ngày 20/3, H