DC (Direct Current) Arc Furnace: Primarily used for steelmaking, it uses a direct electrical current to produce heat to melt the steel scrap. A DC arc furnace typically has a single electrode and a bottom electrode. AC (Alternating Current) Electric Arc Furnace: This is the more traditional type of EAF and uses alternating current to melt the scrap metal. An AC EAF generally has three graphite electrodes.