Nowadays, pulse signals are widely used in various fields of digital and electronic engineering. Therefore, it is necessary to supplement knowledge of circuit analysis with the source as a pulse signal. This article presents the process of analyzing and simulating R-C circuits with rectangular pulse sources. Mathematical model is used for analysis and ATPDraw software is used for simulation. Some applications of R-C circuits in generating spike and sawtooth pulses are also mentioned.Nowadays, pulse signals are widely used in various fields of digital and electronic engineering. Therefore, it is necessary to supplement knowledge of circuit analysis with the source as a pulse signal. This article presents the process of analyzing and simulating R-C circuits with rectangular pulse sources. Mathematical model is used for analysis and ATPDraw software is used for simulation. Some applications of R-C circuits in generating spike and sawtooth pulses are also mentioned.