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纵观近几年高考实验题,题目年年翻新,没有一个照搬课本中的实验,而是对原有实验做了改编、改进甚至创新,但题目涉及的基本知识和基本技能仍然立足于课本实验.实验题作为考查实验能力的有效途径和重要手段,在高考试题中一直占有相当比重,而电学实验又是重中之重,电阻测量成为高考考查的焦点,而伏安法测电阻是电阻测量的最基本的方法.伏安法测电阻常涉及电流表内、外接法的选择与滑动变阻器限流、分压式的选择,前者是考虑减小系统误差,后者是考虑电路的安全及保证可读取的数据量.另外考题还常设置一些困难让考生去克服,如没有电压表或没有电流表等,这就要求考生根据实验要求及提供的仪器,
Looking at the entrance exam questions in recent years, the subject is refurbished year after year, none of them copy the textbook experiment, but the original experiment has been adapted, improved or even innovative, but the subject involved basic knowledge and basic skills are still based on the textbook experiment Experimental questions as an effective way to test the ability of experiments and an important means in the entrance examination has been a considerable proportion of the total, and the electrical experiment is the most important, the resistance measurement has become the focus of the college entrance examination test, and volt-ampere resistance measurement is the resistance measurement The most basic method. Voltammetry resistance often involves the ammeter, the choice of external methods and rheostat rheostat current limit, the choice of partial pressure type, the former is considered to reduce the system error, the latter is to consider the safety of the circuit and can be Read the amount of data.In addition, the exam also often set some difficulties for candidates to overcome, such as the absence of voltmeter or ammeter, etc., which requires the candidates based on experimental requirements and the provision of equipment,