电压表内阻测量是近年来高考的热点,也是学生学习的难点,考察方式多种多样,也是让大多数中学生头疼的问题.其实电压表内阻测量和一般电阻的测量一样,而且优越于一般电阻的测量——电压表可提供自身电压值作为已知条件.下面以一道常见的题目为例,谈谈如何按照题设要求和条件设计电路,测量电压表的内阻.题目为了测量量程为3 V的电压表V的内阻(内阻约 Voltmeter resistance measurement is a hot spot in recent years college entrance examination, but also difficult for students to learn, study a variety of ways, but also for most of the problems of high school students headache. In fact, resistance measurement and general resistance voltmeter measurements, and superior to the general Resistance measurement - voltmeter can provide its own voltage value as a known condition. The following to a common topic, for example, to talk about how to design the circuit in accordance with the requirements and conditions of the test, measuring the internal resistance of the voltmeter .To measure the range 3 V voltmeter internal resistance (internal resistance about