Electric Current and Ohm's Law

This lecture covers the concept of electric current as the flow of charge per unit time through a surface, introducing charge density, current density, and drift velocity of charges. It explains the law of Ohm for conductors, the dependence of resistance and resistivity on temperature, and the application of Poisson's equation in electrostatics. The lecture also discusses the unique solutions of Laplace's and Poisson's equations, the charge image method, and practical examples of solving potential problems. Furthermore, it explores the behavior of electric current in the presence of a magnetic field and the validity of Ohm's law in different materials.