2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/86941In this work we attempt to show in a clear and simple manner the fundamental ideas of the Renormalization Theory. With that intention we use two well-known problems of the Physic and Engeneering undergraduate students, the calculation of the electrostatic and vector potential of a infinite line charge density and current, respectively. We still employ different regularization methods (cut-off, dimensional and zeta function) and the arising of the scale parameter is consider.9 pages, text in PortuguesePhysics Educationtext