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高中物理选修3-1对电容器作了如下描述:“实验表明:一个电容器所带的电荷量Q与电容器两极的电势差U成正比,比值是一个常数。”教师教学用书上介绍了“利用电容器放电测电容”和“用传感器做定量实验学习电容器的概念”2种方法,但都是用I-t图象求“面积”的方法求Q。由于电容器的带电量很难准确测量,教学效果不是很理想。为此,笔者介绍一种自制“恒定电流源”方法:指的是在一定的条
High school physics elective 3-1 on the capacitor made the following description: “Experiments show that: a capacitor with the charge Q and the capacitor potential difference U is proportional to the ratio is a constant. ” The use of capacitors to measure the capacitance of discharge “and ” use the sensor to do the quantitative experimental study of the concept of capacitor “2 kinds of methods, but all use It image to seek ” area “method to seek Q. Due to the capacitance of the capacitor is difficult to accurately measure, the teaching effect is not very satisfactory. To this end, I introduce a self-made ”constant current source " method: refers to a certain article