- Xem d? ?oán b?ch th? 2 s? cu?i c?a các gi?i ??c bi?t và gi?i 8 c?a các t?nh s?p m? th??ng hôm nay.Harmonics are periodic distortions of voltage, present-day, or power sine waves. Harmonics in electricity distribution programs will often be brought on by non-linear hundreds for instance switched mode dc power supplies and adjustable pace mot