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在高中阶段,测量电阻通常采用伏安法.伏安法原理简单、操作方便,通过合理选择内接法与外接法可以使误差很小.因此,伏安法测电阻是高中物理教学的重点与难点,也是高考的热点.以伏安法测电阻为基点,可以创新出许多新的测电阻的方法,这些方法能让我们在实验条件受到限制时,完成实验目标,这就要求我们在平时的学习中多作些创新思考.下面我们以测量安培表为例作些粗浅的探索.1伏安法(1)原理:电路如图1,设电压表与电流表的示数分别为
In high school, the measurement of resistance is usually by voltammetry voltammetry principle is simple, easy to operate, by a reasonable choice of internal and external methods can make the error is very small.Therefore, voltammetry resistance measurement is the focus of high school physics teaching and Difficulties, but also hot college entrance exam to volt-ampere resistance as the starting point, you can innovate a number of new methods of measuring resistance, these methods allow us to experiment in the limited conditions to complete the experimental goal, which requires us in peacetime Learn more about some innovative thinking. Here we measure the ammeter as an example for some superficial exploration .1 voltammetry (1) Principle: The circuit shown in Figure 1, set the voltmeter and ammeter are respectively