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电学中有的动态分析问题经物理规律、物理公式演算出来的最后表达式,难以直接得出结论。若我们根据题目内容作出相关的函数图象,创设条件进行分析,便可从图像上轻松地得出结论。例1在图1所示的电路中,R1和R2为定值电阻,在滑动变阻器R的滑动片p从下端a逐渐滑到上端b的过程中,电
It is difficult to draw conclusions directly from the final expressions of dynamic analysis problems in electricity that are calculated from physical laws and physical formulas. If we make relevant functional images based on the content of the questions and create conditions for analysis, we can easily draw conclusions from the images. Example 1 In the circuit shown in Fig. 1, R1 and R2 are constant-value resistors. During the sliding of the sliding piece p of the sliding varistor R gradually from the lower end a to the upper end b,