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Harmonics are periodic distortions of voltage, latest, or electrical power sine waves. Harmonics in electric power distribution programs tend to be caused by non-linear masses for example switched manner dc ability materials and adjustable speed motor drives. + Các Web-site, ứng dụng quét tá»± Ä‘á»™ng dữ liệu xổ số trá»±c tiếp tá»