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在电磁感应现象中,产生感应电动势的那部分导体(或线圈)相当于电源,这个“电源”不像电池那么直观,稍不注意,就会出现错误。当电磁感应现象中有感应电动势产生,且电路闭合时,会产生感应电流,这类电路问题与恒定电流有着相同的规律,求解时需要利用闭合电路欧姆定律、串并联电路特点进行分析。在求解电磁感应现象中的E-t、I-t图像问题时,要注意电源电动势与外电压的区别,并正确分析内电路与外电路。
In the phenomenon of electromagnetic induction, that part of the conductor (or coil) that produces the induced electromotive force is equivalent to the power supply. This “power supply ” is not as intuitive as the battery. When there is induced electromotive force in the phenomenon of electromagnetic induction, and the circuit is closed, the induced current will be generated. Such circuit problems have the same rules as the constant current. When solving, it is necessary to use the Ohm’s law of the closed circuit and the characteristics of the series-parallel circuit. When solving E-t, I-t image problems in the electromagnetic induction phenomenon, pay attention to the difference between the power electromotive force and the external voltage, and correctly analyze the internal circuit and the external circuit.