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在探究电压、电阻的变化对电流的影响时,由于电压、电阻的变化均会对电流产生影响,所以我们可以采用控制变量法来进行研究.即研究电流跟电压的关系时,保持电阻不变,使得导体两端的电压是整数倍的变化,测出相应的电流值;研究电流与电阻的关系时,保持导体两端的电压不变,测出不同导体中的电流,分析数据得出结论,掌握了方法,可以轻松解题.现举例如下.
When we examine the influence of voltage and resistance on current, we can use the control variable method to study the change of voltage and resistance because of the change of voltage and resistance, that is to say, to keep the resistance constant when studying the relationship between current and voltage , So that the voltage across the conductor is an integer multiple change, measured the corresponding current value; study the relationship between current and resistance to maintain the voltage across the conductor constant measured current in different conductors, the analysis of the data concluded that master The method, you can easily solve the problem. Now for example as follows.