电磁感应作用在导体内部感生的电流被称为傅科电流。导体在磁场中运动或导体静止但存在随时间变化的磁场(或两种情况同时出现),都可能造成磁力线与导体的相对切割。依电磁感应定律可知,在导体中必产生感应电动势,从而驱动电流。该方式引起的电流在导体中的分布随导体表面形状和磁通分布而不同,其路径往往如水中的漩涡,因此被称为涡流。但教师在教学中很难让学生理解其原理,即使学生理解也印象不深,难以记牢。因此,笔者用低成本材料制作 The current induced by electromagnetic induction inside the conductor is called the Foucault current. The movement of a conductor in a magnetic field or a stationary conductor but with a magnetic field that varies with time (or both) can result in relative cuts in the flux and conductors. According to the law of electromagnetic induction we can see that in the conductor will have induced electromotive force, which drives the current. The distribution of current caused by this mode varies with the conductor surface shape and magnetic flux distribution. The path of the current is often swirling in water, so it is called eddy current. However, it is difficult for teachers to make students understand their principles in teaching. Even students’ understanding is impaired and difficult to remember. Therefore, I use low-cost materials