在中考试题中，分析判断电路故障已成为一种常见的题型，其目的在于考查同学们分析和解决实际问题的能力．电路故障的表现形式虽然多种多样，但大多数都是由断路和短路两种情况造成的．因此，可利用下面的思路进行分析判断：断路电路中无电源通过．用电器不工作．电流表无示数 In the mid-test questions, analyzing and judging circuit failures has become a common type of questions. Its purpose is to examine the ability of students to analyze and solve practical problems. Although the circuit failure manifestations are various, most of them are caused by open circuit and short circuit. Therefore, the following ideas can be used for analysis and judgment: no power is passed in the circuit breaker. Electrical appliances do not work. No current meter