Harmonics are periodic distortions of voltage, current, or ability sine waves. Harmonics in electricity distribution systems will often be brought on by non-linear loads such as switched mode dc ability materials and adjustable pace motor drives.Nh?n ??nh update theo th?i gian th?c Ngoài ra, nh?ng bài vi?t soi kèo s? ???c hi?n th? theo th?i gian