In the usual conductive material, the electric current is proportional to the voltage, and the ratio is the resistance of the material, which is known as Ohm's law. Ohm's law also means that the electric current can generate heat, which is proportional to the resistance and the square of the current. The current can waste useless heat and even produce harmful heat, and the whole microelectronics industry is facing the problem of heating. However, in the two singular quantum phenomena of supercon