电路暂态过程分析的计算机程序设计（希望帮到大家）-Circuit transient analysis, computer programming (I hope to help to you)

Charging circuit Assume that for the charging RC circuit above Vs = 10 volts and C = 10 microfarads. Plot the voltage across the capacitor if R equals 5k ohm, 10k ohms and 20k ohms. This just means that we are going to explore three time constants.(