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电路出现的故障,经常是开路或短路,发生短路时,一种情况是整个电路被短路,这种情况是安装电路时所不允许的,一般不会出现,因为电路中的电流不经过任何用电器,电路中的电流过大,会烧坏电源,另一种情况是电路中只有一部分电路被短路,电流不经过这部分电路,因而这部分电路两端没有电压,发生开路时,电路中没有电流,但在断点两侧的任何两点之间都有电压,而在断点同一侧的线路上的任何两点之间都没有电压,了解以上原理,就能分析有关问题了.
Faults in the circuit are often open or shorted. When a short circuit occurs, one condition is that the entire circuit is short-circuited. This is not allowed during the installation of the circuit and will not normally occur because the current in the circuit is not used. Electric appliances, the current in the circuit is too large, it will burn out the power. In another case, only a part of the circuit is short-circuited, and the current does not pass through this part of the circuit. Therefore, there is no voltage at both ends of this part of the circuit. When an open circuit occurs, there is no circuit. Current, but there is voltage between any two points on either side of the breakpoint, and there is no voltage between any two points on the same side of the breakpoint. Understand the above principle and analyze the problem.