Harmonics are periodic distortions of voltage, recent, or electrical power sine waves. Harmonics in power distribution systems tend to be due to non-linear hundreds for example switched method dc ability supplies and adjustable pace motor drives.(Nh?n ??nh, d? ?oán Ph?n Lan vs Kazakhstan) - K?t qu? c?a màn so tài gi?a Ph?n Lan v?i Kazakhstan s?