电路故障主要有断路和短路两种 .要正确分析判断电路的故障 ,首先要理解断路、短路的含义 :断路是电路不通 ,电路中没有电流 ;短路或部分电路被短路时 ,电流直接从导线或开关通过而不经过用电器 .其次要弄懂电表的连接方式 :电流表是串联在电路中的 ,只要电流表有读数 ,电路就 There are two kinds of circuit faults: open circuit and short circuit. To correctly analyze the fault of the circuit, first understand the meaning of the open circuit and short circuit: the circuit is disconnected and the circuit has no current; when the short circuit or some circuit is shorted, the current is directly from the conductor or Switch through without using electrical appliances. Second, to understand the connection of the meter: ammeter is connected in series in the circuit, as long as the ammeter has a reading, the circuit