- 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, latest, or electrical power sine waves. Harmonics in electrical power distribution devices are frequently due to non-linear loads for example switched mode dc ability supplies and adjustable speed