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Harmonics are periodic distortions of voltage, recent, or electricity sine waves. Harmonics in energy distribution units are frequently caused by non-linear hundreds such as switched manner dc power provides and adjustable pace motor drives.Xem thêm Bóng đá VFF mong CĐV ủng hộ HLV Troussier và đội tuyển Việt Nam Patrik Lê Giang