关于线性电容之静态电容和动态电容作用的研究

The Study on the Dynamic Capacity and Static Capacity of Linear Capacity

在对由两个初始电压不为零的电容及一个电阻串联构成的一阶电路分析时,发现研究动态电路的过渡过程时要区分静态电容和动态电容,否则有可能会导致分析计算的错误。计算线性电容储存能量公式中的电容是电容元件的静态电容,初始电荷不等的两个电容元件串联时,其等效静态电容无法确定。一阶RC电路的时间常数中的电容是电容元件的动态电容或电容元件串联、并联的等效动态电容。在分析一阶电路的动态过程时要特别注意这些问题,希望引起从事电路教学工作的同行注意。

When the first order circuit which is composed of two capacities whose initial voltage is not 0 and resistance is analyzed, the dynamic capacity and static capacity must be differentiated, otherwise it has possibility to be able to make mistakes. The capacity is static capacity of capacity cell in the formula which is used to compute＇the storage energy of capacity, and the equivalent static capacity can not be defined , when two capacities are connected in series and the initial electric charge is not zero. The time-constant of capacity in the first order electric circuit is the dynamic capacity of capacity cell or the equivalent dynamic capacity. The problem is presented and proved in this paper, so that the teachers who teach electric circuit to students pay attention to the problem.