Harmonics are periodic distortions of voltage, current, or electricity sine waves. Harmonics in electricity distribution methods are often due to non-linear hundreds for instance switched mode dc electric power supplies and adjustable velocity motor drives. Nếu could mắn trúng thưởng xổ số miền Trung hãy đến ngay một trong hai https://abrahamn913hhh5.wikiusnews.com/user