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变压器在中学物理教学中,历来是电磁学的重点内容,它既联系了电流的磁效应、电磁感应,又为电能的输送做好铺垫.由于中学生的数学知识不足,教材中只介绍了变压器的一般原理.在对变压器原、副线圈端电压、功率、电流、频率之间关系的教学过程中,进行一些必要的公式推导将有助于学生对这些知识的理解.在推导的过程中,笔者发现了一些疑问,本文将重点考查两个疑问题并试图给出自己的解答.1理想变压器原线圈端的电压表达式为什么是U1=n1ΔΦΔt?
Transformer in the middle school physics teaching, has always been the focus of electromagnetics, it is not only linked to the magnetic effects of current, electromagnetic induction, but also pave the way for the transmission of electrical energy. Due to lack of mathematics knowledge of middle school students, teaching materials are only introduced in the transformer General principles. In the process of teaching the relationship between the voltage, power, current and frequency of the transformer primary and secondary coils, some necessary formula derivation will help students understand the knowledge. In the derivation process, the author Found some doubts, this article will focus on the examination of two questions and try to give their own answers. 1 The ideal voltage transformer coil winding expression is why U1 = n1ΔΦΔt?