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电路故障题是初中电学中的一种题型,也是中考常考的一类题．许多同学解此类题时感到困难,不知从何入手．下面通过对几道例题的分析,希望同学们能从中掌握解这种类型题的思路与方法．例1 如图1所示,电压为6 V的电源接在串联的电灯L1、L2两端,若已知电压表的读数为6 V,试分析电路中的故障元件及故障原因．解析:首先,电源不可能有故障,否则V表
The circuit fault question is a question type in junior high school electricity, it is also a class of questions in the entrance exam. Many classmates find it difficult to solve such problems and do not know where to start. The following analysis of several examples of the problem, hope that students can understand the ideas and methods of solving this type of problem. Example 1 As shown in Figure 1, the power supply with a voltage of 6 V is connected across the series of lamps L1 and L2. If the reading of the known voltmeter is 6 V, try to analyze the faulty components in the circuit and the cause of the failure. Analysis: First of all, the power supply can not fail, or V