电学中有一类根据测量结果或要求来分析电路结构或设计电路的所谓“黑箱”问题.这类问题综合性强、难度大,能较好地考查学生思维方式的多样性,运用知识的全面性和解题方法的灵活性,在近年中考中多有出现.现就解题方法做一分析. There is a class of so-called “black box” problems in electrical engineering that analyze circuit structures or design circuits based on measurement results or requirements. These types of problems are comprehensive and difficult, and can be used to better examine the diversity of students’ thinking patterns and use knowledge. The flexibility of comprehensiveness and problem-solving methods has emerged in recent years in the middle school exams. An analysis of the problem-solving methods is now given.