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我从多年的教学实践中体验到,平行板电容器的电容跟哪些因素有关的演示实验能否成功,关键在于能否使平行板电容器带上足够的电量。一般实验用的直流电源的电压均不高,不能使平行板电容器带上足够的电量,因而实验效果不佳。若使用感应起电机给平行板电容器充电,就能使它带上足够的电量,实验效果十分理想。具体做法是: 1.把平行板电容器的两个极板分别用导线接在感应起电机的两个放电金属的杆上(如图1所示)。
I learned from years of teaching practice that the key to the success of demonstration experiments related to the capacitance of the parallel plate capacitors is whether the parallel plate capacitors can be supplied with enough power. The voltage of the DC power supply used in general experiments is not high, and the parallel plate capacitor cannot bring enough power, so the experimental results are not good. If the induction motor is used to charge the parallel plate capacitor, it can bring enough power, and the experimental result is very satisfactory. The specific approach is: 1. Connect the two plates of the parallel plate capacitor with wires to the two discharge metal rods of the induction motor (as shown in Figure 1).