Lecture
This lecture covers the concepts of work and power in electricity, focusing on the movement of free charges in an electrical circuit, the relationship between work and displacement, and the calculation of power in direct current circuits. The instructor explains the flow of charges, the definition of power as energy delivered per unit of time, and the transformation of electrical energy into other forms such as thermal energy. Various examples of energy transformations are discussed, including mechanical to electrical energy conversion and the Joule effect. The lecture also addresses different types of energy conversions in devices like generators, incandescent lamps, and solar cells.