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闭合电路的一部分导体在磁场中做切割磁感线运动时,导体中就产生电流.这种现象叫做电磁感应,产生的电流叫做感应电流. 产生感应电流的条件有两个:(1)闭合电路;(2)一部分导体在磁场中做切割磁感线运动.二者缺一不可.如果电路不闭合,是不可能有电流通过的;如果导体的运动方向与磁感线方向平行,没有做切割磁感线运动,导体内就没有电流通过.
When a part of a conductor in a closed circuit makes a magnetic field motion in a magnetic field, a current is generated in the conductor. This phenomenon is called electromagnetic induction, and the generated current is called induced current. There are two conditions for generating induced current: (1) Closed circuit (2) Part of the conductors in the magnetic field to do cutting magnetic induction line movement. Both are indispensable. If the circuit is not closed, it is impossible to have a current through; if the direction of the conductor’s movement is parallel to the direction of the magnetic flux, no cutting is done. Magnetic induction line motion, there is no current through the conductor.