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      功(gong)(gong)(gong)(gong)率(lv)(lv)因(yin)數指的(de)是有效功(gong)(gong)(gong)(gong)率(lv)(lv)與總耗電量（視在(zai)功(gong)(gong)(gong)(gong)率(lv)(lv)）之間的(de)關系，也就是有效功(gong)(gong)(gong)(gong)率(lv)(lv)除以總耗電量（視在(zai)功(gong)(gong)(gong)(gong)率(lv)(lv)）的(de)比值(zhi)。 基本(ben)上功(gong)(gong)(gong)(gong)率(lv)(lv)因(yin)數可以衡量電力(li)被有效利(li)用的(de)程度(du)，當功(gong)(gong)(gong)(gong)率(lv)(lv)因(yin)數值(zhi)越大，代表其(qi)電力(li)利(li)用率(lv)(lv)越高。

      功(gong)率(lv)因(yin)數是用來衡量用電設備用電效(xiao)率(lv)的(de)參數，低功(gong)率(lv)因(yin)數代表(biao)低電力效(xiao)能。為了提高用電設備功(gong)率(lv)因(yin)數的(de)磁性(xing)器(qi)件就(jiu)稱(cheng)為功(gong)率(lv)因(yin)數校正器(qi)。