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电容器、理想二极管和电源组成图1所示电路,若用绝缘工具使电容器两极板间距离d增大,则电容器的带电量Q将______(填增加、减小或不变),电容器两极板间的电压U_C将______(填升高、降低或不变);若使电容器两极板间距离减小,则电容器的带电量Q将______,电容器两极板间的电压将______。 这道题,与不接二极管的同类题目相比,要难得多,学生初次作此题时极易出错,就是高三的学生在复习时,也常将此题做错。这有一个分析方法的问题,我是这样教学生分析的:
Capacitors, ideal diodes, and power supplies form the circuit shown in Figure 1. If an insulating tool is used to increase the distance d between the two plates of the capacitor, then the charge Q of the capacitor will be ______ (adding, decreasing, or changing), and the capacitor bipolar plate The voltage U_C between them will be ______ (filled up, down or unchanged); if the distance between the two plates of the capacitor is reduced, the charge Q of the capacitor will be ______, and the voltage between the two plates of the capacitor will be ______. This question is much harder than similar topics that do not connect with diodes. Students are prone to making mistakes when they are first asked to do this. That is, when they are reviewing, they often do mistakes. There is a problem with analytical methods. I am teaching students to analyze this: