6SL3352-6TH31-8AA3

6SL3352-6TH31-8AA3

瞬时功率虽然能表面功率在一周期内的变化情况，但是其数值不便于测量和计算，其实际意义不大。人们通常所说的电路的功率都是指瞬时功率在一周期内的平均值，称为平均功率或有功功率，以大写字母“P”表示，经数学推算可得：

　　其单位为瓦塔，可见，当电压和电流以有效值表示时，纯电阻电路中的平均功率的表示式具有和直流电路相同的形式。

　　交流电功率计算公式：

　　交流电是要考虑功率因数的，P=UIcosq，这是单相交流电。对于三相平衡电路来说，要乘以根号3，U、I为线电压与线电流的有效值。

6SL3352-6TH31-8AA3 

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