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电磁感应现象中产生的感应电动势遵循法拉第电磁感应定律,一般情况下都是求单一的电动势,直接套用公式就可以解决。如果电路中同时产生两个电动势则整个电路中的“等效电动势”如何求?成为最近几年高考的重点和热点,2003年高考江苏物理卷18题又再次出现,下面就电磁感应现象中产生两个电动势即所谓“等效电动势”的具体运用分别归类讨论
The induced electromotive force generated in the electromagnetic induction phenomenon follows Faraday’s law of electromagnetic induction. Under normal circumstances, a single electromotive force is required. Applying a formula directly can solve this problem. If the circuit generates two electromotive forces at the same time, then the “equivalent electromotive force” in the whole circuit is the focus and hot spot of the college entrance examination in recent years. The 18 questions in the Jiangsu physical examination volume in the 2003 college entrance examination reappeared. The electromagnetic induction phenomenon appeared in the following. The specific application of the two electromotive forces, the so-called “equivalent electromotive force”, is categorized and discussed separately.