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06-06-2011 11:21 PM

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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