Matsakaicin wutar lantarki (PF) shine rabon ƙarfin aiki, wanda aka auna shi cikin kilowatts (kW), zuwa ikon bayyane, wanda aka auna cikin amperes kilovolt (kVA). Ƙarfin da aka bayyana, wanda kuma aka sani da buƙata, shine ma'aunin ƙarfin da ake amfani da shi don tafiyar da injuna da kayan aiki a cikin wani ɗan lokaci. Ana samun ta ta hanyar ninkawa (kVA = V x A)