Hitar wutar lantarki da ke hana fashewa wani nau'i ne na makamashin lantarki mai cinyewa wanda aka canza zuwa makamashin zafi don dumama kayan da za a dumama.A lokacin aiki, matsakaicin matsakaicin ƙarancin zafin jiki yana shiga tashar shigarwar ƙarƙashin matsin lamba ta hanyar bututun, kuma yana ɗauke da ƙarfin zafi mai zafi wanda injin dumama wutar lantarki ke samarwa tare da takamaiman tashar musayar zafi a cikin jirgin ruwa na wutar lantarki, ta amfani da hanyar da aka tsara. ta ka'idar thermodynamics ruwa.