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Old 06-06-2011, 11:21 PM   #1
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Default 视在功率

视在功率
  交流纯电阻电路的功率计算如下:电阻消耗的功率在任一瞬时都是正值,polo cheap,即在任一时刻都向电源吸取电能,一周期内瞬时的平均值称为平均功率,polo t shirt,又称有功功率,用P表示,单位为W,它等于电压的有效值和电流的有效值的乘积即:P==UI=I平方×R =U平方\R .
  KVA是设备的输出容量,单位是VA或KVA.
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