一、功率表和功率因數表區別

功(gong)(gong)率(lv)因數指(zhi)有功(gong)(gong)功(gong)(gong)率(lv)和(he)視(shi)在功(gong)(gong)率(lv)的(de)(de)比值，一般(ban)用符(fu)號(hao)λ表示(shi)(shi)，即：λ=P/S。在正弦交(jiao)流(liu)電路中，功(gong)(gong)率(lv)因數等于電壓(ya)與電流(liu)之(zhi)間的(de)(de)相位(wei)差（ψ）的(de)(de)余弦值，用符(fu)號(hao)COSψ表示(shi)(shi)。此時(shi)，COSψ=λ。

功(gong)(gong)率因(yin)數表(biao)是指單相交流電路或電壓對稱負(fu)載平衡的三相交流電路中測量功(gong)(gong)率因(yin)數的儀表(biao)。常見的功(gong)(gong)率因(yin)數表(biao)有電動(dong)(dong)系、鐵磁(ci)電動(dong)(dong)系、電磁(ci)系和變換器式等幾種。

功率表也(ye)叫瓦(wa)特表，是一種測量(liang)電(dian)功(gong)率的儀(yi)器。電(dian)功(gong)率包括有功(gong)功(gong)率、無功(gong)功(gong)率和視在功(gong)率。未作特殊說(shuo)明時，功(gong)率表一般(ban)是指測量(liang)有功(gong)功(gong)率的儀(yi)表。

二、功率因數表能替代功率表嗎

功率(lv)(lv)因數表(biao)不能(neng)替代功率(lv)(lv)表(biao)，它們有著不同的功能(neng)和應(ying)用場景(jing)。

功(gong)(gong)率(lv)(lv)(lv)(lv)因數表只測量功(gong)(gong)率(lv)(lv)(lv)(lv)因數和(he)其他電氣(qi)參數，不(bu)能直接(jie)測量實際功(gong)(gong)率(lv)(lv)(lv)(lv)和(he)其他功(gong)(gong)率(lv)(lv)(lv)(lv)值。而功(gong)(gong)率(lv)(lv)(lv)(lv)表則可(ke)以同時測量實際功(gong)(gong)率(lv)(lv)(lv)(lv)、有功(gong)(gong)功(gong)(gong)率(lv)(lv)(lv)(lv)、無功(gong)(gong)功(gong)(gong)率(lv)(lv)(lv)(lv)和(he)視(shi)在功(gong)(gong)率(lv)(lv)(lv)(lv)等多個參數。

功率因數表和功率表的(de)(de)應用(yong)(yong)(yong)范(fan)圍也(ye)有(you)所不同。功(gong)率(lv)(lv)(lv)因數(shu)(shu)表主要用(yong)(yong)(yong)于測(ce)量電(dian)路中(zhong)的(de)(de)功(gong)率(lv)(lv)(lv)因數(shu)(shu)，通常應用(yong)(yong)(yong)于檢測(ce)電(dian)路中(zhong)的(de)(de)無(wu)功(gong)功(gong)率(lv)(lv)(lv)和功(gong)率(lv)(lv)(lv)因數(shu)(shu)等(deng)參數(shu)(shu)，以優化電(dian)路負載(zai)和提(ti)高電(dian)能利用(yong)(yong)(yong)效率(lv)(lv)(lv)。功(gong)率(lv)(lv)(lv)表則(ze)可用(yong)(yong)(yong)于測(ce)量電(dian)路中(zhong)各種功(gong)率(lv)(lv)(lv)值，廣泛應用(yong)(yong)(yong)于家庭(ting)、工業、商業等(deng)領域中(zhong)的(de)(de)電(dian)力監測(ce)和控制。

三、功率因數和功率的關系

功(gong)(gong)率(lv)(lv)因(yin)數和(he)功(gong)(gong)率(lv)(lv)的(de)關(guan)系是：功(gong)(gong)率(lv)(lv)因(yin)數=有(you)功(gong)(gong)功(gong)(gong)率(lv)(lv)/視在功(gong)(gong)率(lv)(lv)。功(gong)(gong)率(lv)(lv)因(yin)數是有(you)功(gong)(gong)功(gong)(gong)率(lv)(lv)與視在功(gong)(gong)率(lv)(lv)的(de)比值，它的(de)大小(xiao)與電路的(de)負載性質有(you)關(guan)。對于(yu)電感設備比如電動機等，功(gong)(gong)率(lv)(lv)因(yin)數小(xiao)于(yu)1。有(you)功(gong)(gong)功(gong)(gong)率(lv)(lv)和(he)功(gong)(gong)率(lv)(lv)因(yin)數的(de)關(guan)系可以用公式P=UIcosφ表示，其(qi)中cosφ就是功(gong)(gong)率(lv)(lv)因(yin)數。