Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u ch?nh)Harmonics are periodic distortions of voltage, present, or power sine waves. Harmonics in electrical power distribution techniques are frequently attributable to non-linear masses for instance switched mode dc energy materials and adjustable pace motor drives.Other ele