伏安法测量电表内阻的方法灵活、多变,是高考实验题中最为活跃的题型,对学生的能力要求最高,同时也是许多同学感到最为棘手的问题。伏安法测电阻电路设计的基本思路:“电路设计单元化;先搭框架,后挂表。”所谓“电路设计单元化”是指:我们可以把电路分成“供电电路”和“测量电路”两个单元来进行设计。“测量电路”是指测量被测电阻的电路,设计时主要考虑电表的选用和电流表内、外接法 The voltammetric method of measuring the internal resistance of a meter is flexible and changeable. It is the most active type of test in the college entrance examination and possesses the highest requirements on students’ abilities. At the same time, it is also the problem that many students feel the most troublesome. Voltammetry resistance measurement circuit design of the basic idea: “circuit design unit; first frame, after hanging table. ” The so-called “circuit design unit ” means: we can divide the circuit into “power supply circuit ”And“ measurement circuit ”two units to design. “Measurement circuit ” refers to the measurement of the resistance of the circuit, the design of the main consideration meter selection and ammeter, the external method