本文通过将人教版教材中多用电表一节的例题,改造成一个自主设计实验,展开学生的探究活动.在实施过程中,先通过理论探究得到多用电表欧姆挡的原理,再通过实验探究得到多用电表欧姆挡的测量特点.并且自主设计了实验数据的处理方法,即利用R_x-I_x图像,非常好地解释了多用电表的表盘特点,定性半定量地讨论了中值电阻误差问题,获得了很好的教学效果. In this paper, the example of multi-meter in the PEP textbook is transformed into a self-designed experiment to explore the students’ inquiry activities.In the process of implementation, the principle of multi-meter ohms block is first explored through theory, Multi-meter ohm block measurement characteristics. And independent design of the experimental data processing method that the use of R_x-I_x image, very good to explain the multimeter ammeter characteristics, qualitative and semi-quantitative discussion of the median resistance error problem, obtained Very good teaching results.