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1994年全国普通高考物理A卷的第25题,是一道考查伏安法测电阻的电学实验题。其题目、答案及评分标准如下: 25.图为用伏安法测量一个定值电阻阻值的实验所需的器材实物图,器材规格如下: (1)待测电阻R_x(约100欧) (2)直流是安表(量程0—10毫安,内阻50欧)
In the 25th issue of the National Physical Education Examination Vol. A in 1994, it was an electrical experiment to test the resistance of the voltammetry. The title, answer and rating criteria are as follows: 25. The figure shows a physical map of the equipment required to measure the resistance of a constant value resistor by voltammetry. The specifications of the equipment are as follows: (1) Resistance to be measured R_x (approximately 100 ohms) ( 2) DC is an ammeter (range 0-10 mA, internal resistance 50 ohms)