Ma'anar ƙamus na Ƙarfin Electromotive (EMF) shine makamashin kowane cajin naúrar da ake bayarwa ta hanyar makamashi, kamar baturi ko janareta, zuwa da'ira ko na'ura. Ana auna EMF a cikin volts (V) kuma yana wakiltar bambancin yuwuwar wutar lantarki tsakanin maki biyu a cikin da'ira ko na'ura, wanda ke tafiyar da kwararar wutar lantarki. Kalmar “electromotive” ta samo asali ne daga gaskiyar cewa wannan ƙarfin yana samuwa ne ta hanyar motsin ƙwayoyin da aka caje, irin su electrons, ta hanyar madubi.