如何判断电路中电流表、电压表的示数变化，一般来说是用欧姆定律和串、并联电路的特点来进行判断．但比较关键的一点是要搞清电路结构，怎样才能搞清电路结构呢？首先要明确一点．即：电流表团内阻较小，在分析电路时，可视为通路，而电压表团电阻较大，在分析电路时，可视为 How to determine the change of the ammeter and voltmeter in the circuit is generally judged by Ohm’s law and the characteristics of series and parallel circuits. However, the key point is to find out the circuit structure. How can we find out the circuit structure? First of all, be clear. That is, the internal resistance of the ammeter group is small. When the circuit is analyzed, it can be regarded as a path, and the voltage group resistance is large. When the circuit is analyzed, it can be regarded as