物理中考常常涉及电学变量问题,这也是考查同学们是否正确分析电路和处理变量能力的一类题型。但由于同学们的数学知识有所欠缺(不等式法、极值法是高中数学常用的方法),或者说许多初三同学缺乏数理结合的思维方式和经验,所以在解答这类题时要么无所适从,要么想当然地去解答,往往得出错误的答案。其实有些物理题型是有规律可循的,理解并掌握规律,不管题设怎样变 Physical examination often involves the issue of electrical variables, which is also a test of students whether the correct analysis of circuits and the ability to deal with a type of questions. However, due to the lack of mathematical knowledge of students (inequality method, extreme value method is commonly used in high school mathematics method), or many third-year students lack the mathematical combination of thinking and experience, so in answering these questions at a loss, Either take it for granted, often come to the wrong answer. In fact, some physics questions are based on laws that follow and understand the rules