学习物理,随着所学知识的增多,物理计算题将越来越多,怎样通过一道习题,变换成多种不同题目,有程序地进行分析、解答,达到一题多变,融会贯通的目的.本文通过一道习题的变异略作探讨.题目在图1所示的电路中,R_1=3Ω、R_3=9Ω,电压表V_1的示数为9V,V_2的示数为15V,求电阻R_2的阻值和A、B间的电压及电流表的示数.解析遇到有电压表接入电路中的复杂电路, Learn physics, with the increase of knowledge, physical computing problems will be more and more, how to pass an exercise, into a variety of different topics, procedures for analysis, answer, to achieve a changeable, easy to understand. In this paper, a variation of the exercise is a little discussed topic in the circuit shown in Figure 1, R_1 = 3Ω, R_3 = 9Ω, the voltmeter V_1 shows the number of 9V, V_2 shows the number of 15V, the resistance R_2 resistance And A, B between the voltage and ammeter shows the number of analytic encounter voltage meter access circuit in the complex circuit,