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自感现象是电磁感应现象的特例,是高考的一个热点及难点,在教学中发现,不少学生对于课本实验的理解并不困难,但对于稍复杂的自感问题的分析常常束手无策.结合多年的教学经验,笔者认为:以电流为抓手,灵活运用自感线圈的电流特性是解决自感问题的有效方法.线圈的电流特性包括:(1)在自感线圈能构成回路的情况下,外部条件变化,线圈中电流不能突变只能渐变;(2)当线圈不能构成回路时,线圈中电流立即为零,(3)当电路稳定后,电流不再变化,线圈相当于一电阻,理想的线圈直流电阻为0.下面结合实例分两种情况予以分析.
Self-inductance phenomenon is a special case of electromagnetic induction phenomenon, is a hot spot and difficulty in the college entrance examination, found in teaching, many students understand the textbook experiment is not difficult, but for a little complicated analysis of self-inductance problems often helpless. Of the teaching experience, the author believes that: the current as the starting point, the flexibility to use the current characteristics of self-inductance coil is an effective way to solve the problem of self-inductance.Current characteristics of the coil include: (1) in the case of self-inductance coil can form a loop, (2) When the coil can not form a loop, the current in the coil is zero immediately. (3) When the circuit is stable, the current does not change any more. The coil is equivalent to a resistor. The ideal Of the coil DC resistance is 0. The following two examples to be analyzed with examples.