Nh?n ??nh, soi kèo Viettel v?i Công an Hà N?i, 19h15 ngày 13/03: L?ch s? l?p l?i Nh?n ??nh Ngo?i h?ng UgandaHarmonics are periodic distortions of voltage, present-day, or ability sine waves. Harmonics in energy distribution techniques will often be a result of non-linear loads which include switched mode dc energy provides and adjustable speed