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The relationship between the effective power and apparent po

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The relationship between the effective power and apparent power 有效功率与视在功率之间的关系?
The relationship between the effective power and apparent po
这是对使用正弦交流电的用电器而产生的两个概念.
视在功率就是该交流电的电压有效值和电流有效值的乘积.
有效值是交流电在一个周期内的方均根值.亦即,将交流电通过一电阻在一个周期内消耗的能量,若与一直流电通过同一电阻在相同时间内消耗的能量相等,则此直流电的量值被定义为该交流电的有效值.
有效功率亦称为有功功率,它是交流电路功率在一个周期内的平均值称为平均功率,也称为有功功率.它实质上反映了电路从电源取得的净功率.
有功功率等于视在功率乘功率因数,而功率因数等于电压和电流相位差的余弦.
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