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在“伏安法”测电阻的实验中,由于电压表和电流表内阻的影响,无论采用内接法还是外接法,总是因实验电路的缺陷而不可避免地引起系统误差,改进实验方法、减小实验误差、提高实验精度、完善设计性实验是实验研究永恒的课题,也是高考命题永久关注的重点内容.故此,本文设计了消除电表内阻引起误差的多种实验电路,现介绍如下:
In the experiment of “volt-ampere measurement” resistance measurement, due to the influence of the internal resistance of the voltmeter and the ammeter, whether the in-line method or the external method is used, the system error is always caused by the defect of the experimental circuit, and the experimental method is improved. Reducing experimental errors, improving experimental accuracy, and perfecting design experiments are eternal topics for experimental research and are the focus of permanent attention on the college entrance examination proposition. Therefore, this article has designed a variety of experimental circuits to eliminate the errors caused by the internal resistance of the meter, as follows: