Basic Models and Applications of Resistor-Capacitor Circuits and Simulations Using Falstad

This paper discusses a common alignment of two passive components, capacitors and resistors, in circuits. In DC(Direct Current) circuits, the alignment of resistors and capacitors provides a time constant for both the charging and discharging process. Some basic applications are illustrated in the paper as Sioe et al. (2005) suggest incorporating resistors and capacitors to buffer the overheat in batteries. The paper then discusses the RC circuits under alternating current serving as a voltage divider due to the impeding effect to the current by the capacitors with calculation and simulations using Falstad (an online circuit simulator). Yasith et al. (2010) establishes a basic RC voltage divider and filter with tunable ionic liquid. First order low pass Butterworth filter is then discussed with calculations and simulations. This paper manages to establish some fundamental but significant directions in which RC circuits with more complex structure could be developed and utilized.