大家知道,用电流表不仅可以测量电路中电流的大小,还可以根据电流表有无示数来判断电路中有无电流通过.在有故障的电路中,若电流表有示数,说明电路中有电流,电路是处处连通的闭合电路,这时的故障只能是短路;若电流表无示数,说明电路中无电流通过,在排除电流表自身故障的情况下, As we all know, using an ammeter can not only measure the current in the circuit, but also can judge whether or not current flows in the circuit according to the presence or absence of an ammeter. In a faulty circuit, if the ammeter shows a number, it indicates that there is current in the circuit. The circuit is a closed circuit connected everywhere, and the fault at this time can only be a short circuit; if the current meter has no indication, no current flows through the circuit, and in the case of excluding the fault of the current meter itself,