Most modern arc furnaces are of the direct arc type. In the furnace the heat is generated by the arcs formed between the carbon electrodes and the metal charge, and by the resistance of the charge to the electric current.

• 大多数现代电弧炉都是直接电弧式的。炉子的热是利用石墨电极和金属炉料之问产生的电弧以及炉料对电流的电阻来取得的。