Electronic Devices Emil Panov and Miroslava Doneva 11 1 2022 https://doi.org/10.6025/ed/2022/11/1/1-8 https://www.dline.info/ed/fulltext/v11n1/edv11n1_1.pdf For electric circuits, the coefficients play a major role where the variational roles need to be studied. In many studies the methods used for DC, AC and transient analysis of linear and non-linear EC are addressed extensively. We have highlighted the studies with a few illustrations.