论文部分内容阅读
2013年北京理科综合能力测试卷物理试题的第21题是一道电学实验题.命题者将该大题共编制了5个问题,设置全面,层次分明,且问问递进,是一道稳中有变以考查能力立意的好题.尤其是作为压轴的最后一问,如果考生没有很好的数学功底,可能难以做出正确选择.本文就最后一问通过几种方法做一解析,与大家共同探讨.1原题呈现某学生通过实验测定一个阻值约为5Ω的电阻Rx的阻值.现有电源(4V,内阻可不计),滑动变阻器(0~50Ω,
2013 Beijing Science Comprehensive Ability Test Volume Physics Question No. 21 is an electrical experiment topic.The proponent of the major problems were compiled a total of five questions, set a comprehensive, structured, and ask progressive, is a steady with Change to examine the ability to conception of a good question, especially as the last question of the finale, if the candidate does not have a good math, it may be difficult to make the right choice.This article on the last question through a number of methods to do an analysis, with everyone Discussion .1 The original presentation of a student experimentally determined by a resistance of about 5Ω resistance Rx resistance. Existing power supply (4V, excluding resistance), sliding rheostat (0 ~ 50Ω,