用伏安法测电阻 ,一般有两种方法 ,即外接法和内接法。也就是说 ,当待测电阻的阻值远小于伏特表的内阻时 ,用外接法 ;当待测电阻的阻值远大于安培表的内阻时 ,用内接法这个问题 ,我们都比较熟悉 ,在此不再多写。我们知道 ,常用伏特表的内阻 ,一般都在几千欧至十几千欧 ,常用的 There are generally two methods for measuring resistance using volt-ampere measurement, ie, external and indirect methods. That is, when the resistance of the resistance to be measured is much smaller than the internal resistance of the voltmeter, an external method is used; when the resistance of the resistance to be measured is much greater than the internal resistance of the amperemeter, we use the inline method to compare the problems. Familiar, no longer write more here. We know that the internal resistance of commonly used voltmeters is generally in the range of several thousand euros to ten thousand euros.