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  Introduction: Bardeen-Cooper-Schrieffer theory (BCS theory) is the first microscopic theory of superconductivity. Cooper had discovered that electrons are in pairs in a superconductor and named as Cooper pairs. The theory describes superconductivity as an effect caused by the condensation (I will talk briefly about condensation later in this article) of the Cooper pair. The motion of all the Cooper pairs within a single superconductor constitutes a system that functions as a single entity. Applying an electrical voltage to the superconductor causes all Cooper pairs to move, forming a current. Even in the absence of voltage, the current flow continues indefinitely. The reason is that the Cooper pairs encounter no opposition inside the conductor. We should stop all the cooper pairs simultaneously to cease the current flow. As the superconductor is warmed, its Cooper pairs separate into individual electrons, and the material becomes normal or non-superconducting. Superconductors abrupt