Harmonics are periodic distortions of voltage, present-day, or electricity sine waves. Harmonics in electricity distribution techniques are frequently because of non-linear masses such as switched mode dc electricity provides and adjustable pace motor drives.HLV tuy?n Indonesia ph?n pháo Duy M?nh: 'Tôi th?y ?T Vi?t Nam c?ng nh?p t?ch' Th? thao 20