elektrikaarahi ahjutäite sulatamiseks kaare otsetoimel (kaar põleb elektroodi ja ahjutäite vahel) (vt elektrikaarahi; vrd kaudtoimekaarahi), an electric furnace in which a single electrode positioned at the center of the furnace roof is the catode of the system; current passes from the electrode through the charge or bath to the cathode located at the bottom of the furnace; current from the bottom of the furnace then passes through the furnace refractories to the copper base plate to outside cables; used in production of ferroalloys, carbon and alloy steels (see: electric arc furnace; compare: indirect-arc furnace)