As the alternating current cycles back and forth, the resulting variation in the magnetic field sloshes these vortices around within the superconductor, losing energy as heat as they do so.

• 当交流电的电流发生周期性变化时，随之改变的磁场会使超导体内部的旋涡产生震荡，在此过程中部分能量会以热能的形式散失。