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闭合电路动态分析是高中物理的热点问题,其中ΔU/ΔI的变化规律更是此类题型的难点所在,下面分别从干路、支路中的电流、电压变化切入,全面探讨ΔU/ΔI的变化规律.1干路电压和干路电流如图1所示电路,接入理想电表(文中所有电表均为理想电表),只存在一个回路,改变电阻R_2时,U_1、U_2和I(分别为3个电表的读数,下同)随之改变.
The dynamic analysis of closed circuit is a hot issue in high school physics. The variation of ΔU / ΔI is more difficult for this type of problem. The following are the current and voltage changes in trunk and branch, respectively. (1) The main circuit voltage and the main circuit current are shown in Fig. 1. The circuit is connected to the ideal meter (all meters in the paper are ideal ammeter), there is only one circuit. When changing the resistance R_2, U_1, U_2 and I 3 meter reading, the same below) will change.