Harmonics are periodic distortions of voltage, current, or electrical power sine waves. Harmonics in electricity distribution methods in many cases are due to non-linear loads for instance switched mode dc power provides and adjustable velocity motor drives. + Các Internet site, ?ng d?ng quét t? ??ng d? li?u x? s? tr?c ti?p t? X? S? Minh Ng?c:�

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