Lecture
This lecture covers Ohm's law, which relates current density and electric field, and the concept of resistance in materials. It explains how resistance is related to the flow of charges induced by an electric field, and discusses the specific electrical conductivity and resistivity of different materials. The lecture also delves into the units and values associated with resistance, specific resistivity, and conductivity, providing examples of resistivities for various materials. Additionally, it explores the distinction between perfect conductors and resistors, highlighting the behavior of electric fields inside conductors. The summary includes a recap of the key concepts discussed, such as Ohm's law, current density, and resistance, emphasizing their practical applications.