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病态电路问题是中考的一个热点,它能考查学生多方面的电学知识,不少同学因找不到合适的分析方法而感到困难,下面结合中考题谈谈这类问题的分析方法, 一、根据电压表和电流表示数情况寻找电路故障方法:①若电压表有示数(有明显偏转)且等于电源电压而电流表无示数,则电路中必然是发生了断路故障,且断路点就在电压表两接线柱之间的所测部分.原因是此时其他用电器
The problematic circuit problem is a hot spot in the entrance examination. It can examine students’ electrical knowledge in various aspects. Many students find it difficult to find a suitable analysis method. The following analysis methods for the analysis of this type of problem in conjunction with the examination questions are given. Voltmeter and current display number to find the circuit fault method: 1 If the voltmeter shows the number (with a significant deflection) and is equal to the power supply voltage and the current meter has no indication, then the circuit must have a breakage fault, and the break point is at the voltage The measured part between the two terminals of the meter. The reason is that other electrical appliances at this time