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电学中有一些从表面看来比较琐碎的电路问题。但在这些问题中,有的是比较重要的。稍有“不慎”,就会引发费解、失误、上当。一、咬文嚼字话“显著”用伏—安法测电阻,对应于内、外接两种不同的接法,其测量值的精确度一般是不相同的。如果在用这两种接法分别测量同一电阻的过程中,电压表示数变化显著,则用外接法比较精确;若电流表示数变化显著,则表明电压表的分流作用较强,故这时用内接法比较精确。这里的“显著”是什么意思呢?一些同学由于对这个词在物理中的意义不甚理解,导致失误。
There are some seemingly trivial circuit problems in electricity. However, some of these issues are more important. A slight “failure” can lead to confusion, mistakes, and fooling. First, the word “conspicuously” uses the volt-ampere method to measure the resistance, which corresponds to two different connection methods: internal and external. The accuracy of the measured values is generally not the same. If in the process of measuring the same resistance with these two connections, the voltage representation number changes significantly, then the external method is more accurate; if the current representation number changes significantly, it indicates that the voltage meter has a strong diversion effect, so this time The inlay method is more accurate. What is the meaning of “significant” here? Some students have made mistakes because they do not understand the meaning of the word in physics.