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“半偏法测电流表内阻”是一个重要的电学实验,高考中出现的频率也很高。但由于实验本身存在无法避免的系统误差,有许多文章中谈到了对该实验的改进,现以某文“测量电流表内阻电路的改进”(以下简称[原文])为例,谈一些看法。一、对该方案的一些疑问如图1为教材原理图,G表内阻的测量值偏小,其步骤为大家熟知,这里不再叙述。
The “half-side method for measuring the internal resistance of the ammeter” is an important electrical experiment. The frequency of appearance in the college entrance examination is also high. However, due to the existence of unavoidable systematic errors in the experiment itself, there are many articles that talk about improvement of the experiment. Now we use the article “Improvement of measuring the internal resistance of current meter” (hereafter referred to as [the original]) as an example. view. First, some questions about the program as shown in Figure 1 is a schematic diagram of teaching materials, G table internal resistance measurement value is too small, its steps are well-known, no longer described here.