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我们知道,测量电阻最基本的方法是伏安法,就是用电流表测量通过待测电阻的电流I和用电压表测量待测电阻两端的电压U,然后根据公式R=U/I就可以算出待测电阻的大小。实验方法有电流表内接法和外接法两种。当待测电阻很大时,采用电流表内接法可以减小误差,而待测电阻比较小时,则采用电流表外接法了。它们实验电路图如下:
We know that the most basic method of measuring resistance voltammetry, is to use ammeter to measure the current through the resistor I and the voltage measured by measuring the voltage across the resistor U, and then calculated according to the formula R = U / I Measuring the size of resistance. There are two kinds of experimental methods: internal ammeter and external circuit. When the resistance to be measured is large, the use of ammeter internal connection method can reduce the error, while the measured resistance is relatively small, the use of ammeter external method. Their experimental circuit is as follows: