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用欧姆表测电阻是高考考纲要求的实验之一,实验中有这样一个注意事项,就是欧姆表内部的电池旧了一定要换新的,如不换,则测出的阻值误差较大。那么为什么会产生误差?误差怎样分析?往往在上新课时不做讨论,但在高考复习时这个问题就必须向学生讲清楚。
The use of ohmmeter to measure resistance is one of the requirements of the college entrance examination syllabus. One of the precautions in the experiment is that the internal battery of the ohmmeter must be replaced with a new one. If it is not replaced, the measured resistance error is large. So why is there an error? How is the error analysed? It is often not discussed during the new class. However, this problem must be clearly explained to the student during the review of the college entrance examination.