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电磁感应是中学物理课程教学中的重要内容之一。自感和互感是典型的电磁感应现象,互感原理被广泛应用于电气和电工技术中。在中学物理新课程教材中,介绍了“电压、电流互感器”概念、装置及其在日常生活中的应用案例,在物理参考资料和课堂教学中,基于这两种互感器的讨论和分析较多,但是笔者对于“电流互感器”的讨论和解读存在一点异议,在这里呈现给读者,旨在抛砖引玉,希望能够引起同仁的进一步思考与探究。一、电压和电流互感器的常见解读与困惑电压互感器是将高电压转化成低电压进行测量的装置,并联于被测电路之中,理想电压互感器相当于一个降压变压器,则电压互感器输入和输出电压满
Electromagnetic induction is one of the important contents in physics teaching in middle school. Self inductance and mutual inductance are typical phenomena of electromagnetic induction. The principle of mutual inductance is widely used in electrical and electrical engineering. Introduced in the physics teaching new curriculum materials, “voltage, current transformer ” concept, device and its application in daily life in the case of physical reference materials and classroom teaching, based on the discussion of these two kinds of transformer and Analysis, but the author of the “Current Transformer ” discussion and interpretation of a little objection, presented here to readers, designed to start a discussion, hoping to arouse my colleagues for further thinking and exploration. First, the common interpretation of voltage and current transformers and confusion Voltage transformer is a device that converts high voltage into low voltage for measurement, in parallel with the circuit under test, the ideal voltage transformer is equivalent to a step-down transformer, the voltage mutual inductance Input and output voltage is full