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指示燈

電功率計(jì)算公式

發(fā)布日期:2022-04-26 點(diǎn)擊率:109

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電功率計(jì)算公式:
在純直流電路中:P=UI         P=I2R        P=U2/R         式中:P---電功率(W),U---電壓(V),
                                                    I----電流(A),  R---電阻(Ω).
在單相交流電路中:P=UIcosφ          式中:cosφ---功率因數(shù),   如白熾燈、電爐、電烙鐵等可視為
                                   電阻性負(fù)載,其  cos φ=1 則   P=UI               
                                                              U、I---分別為相電壓、電流。
在對稱三相交流電路中,不論負(fù)載的連接是哪種形式,對稱三相負(fù)載的平均功率都是:
  P=√3UIcosφ        式中:U、I---分別為線電壓、線電流。
                       cosφ ---功率因數(shù),若為三相阻性負(fù)載,如三相電爐, cosφ=1
                                          則P=√3UI。

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