A quantitative estimation of the electromagnetic property of superconducting conductors under the various conditions is important for applications of superconductivity. However, there are many cases in which we cannot estimate their properties in detail, because the conductor has a complicate structure being composed of both superconductors characterized by a hysteretic magnetic property and normal metal conductors as a stabilizers. In the present paper, we review the well-known basic electromagnetic properties of a multifilamentary superconducting wire as a strand for the conductor, which have been made clear through many researchers. Fundamental views on the property of the conductor, which is composed of the wires, are also described.
