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从实验的思想方法来看,高中电学实验可归纳为三大类:伏安法、半偏法、等效法.本文以伏安法模块为主,谈谈这三类实验思想及教学与复习建议.一、伏安法思想伏安法是指通过对被测对象电压、电流的测定来求得其电阻、伏安特性曲线、电动势等电学量,或再由其某些电学量转而求出一些非电学量如长度、截面积等.伏安法是高中电学实验的最大模块,大部分实验均属于这个模块.1.伏安法的基本情形图1(a)为测小阻值电阻的情形,图1(b)为测大阻值电阻的情形(两表内阻均未知).测金属丝的电阻率和描绘小灯泡伏安特性曲线时由于其阻值较小,一般也用图1(a)电路,不过由于描绘小灯泡伏安特性曲线时要求电压调节范围大,需配上分压式电路,这里
From the experimental thinking method, high school electrical experiments can be summarized into three categories: voltammetry, semi-partial method, equivalent method.In this paper, the main volt-ampere module, talk about these three types of experimental ideas and teaching and review of recommendations Voltammetry voltammetry voltammetry refers to the measured object by measuring the voltage and current to find the resistance, volt-ampere characteristics, electromotive force and other electrical quantities, or from some of its electrical quantities go out Some non-electrical quantities such as length, cross-sectional area, etc. Voltammetry is the largest module of high school electrical experiments, most of the experiments belong to this module.1 The basic situation of the voltammetry Figure 1 (a) to measure the resistance of small resistance Figure 1 (b) for the case of large resistance measurement (both table resistance are unknown.) Measuring the resistivity of the wire and depict the small bulb volt-ampere characteristics of the curve because of its smaller, generally used 1 (a) circuit. However, since the voltage regulation range is required to describe the volt-ampere characteristic curve of a small bulb, a voltage dividing circuit needs to be provided. Here,