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在电学实验里,电源电动势和内电阻的测量是一个重要内容,因为测量方法灵活多样,已成为高考设计性实验命题的热点。实验中除了课本上利用安培表、伏特表、滑动变阻器、电源、导线、开关测电源电动势和内电阻外,还有一些特殊的方法,现分析如下:例1有以下器材:定值电阻两个R1、R2,
In the electrical experiment, the measurement of power EMF and internal resistance is an important content, because the measurement method is flexible and diverse, and it has become a hot topic of the design experiment of the college entrance examination. In addition to using textbooks such as ammeters, voltmeters, sliding rheostats, power supplies, wires, and switch-mode power electromotive force and internal resistance, there are also some special methods that are analyzed as follows: Example 1 has the following equipment: fixed-value resistors R1, R2,