This lecture explores eddy currents, their origins, and practical applications such as braking systems using Maxwell's equations. Through a finite element simulation example, the instructor demonstrates how varying magnetic fields induce currents in conductors, leading to energy losses. Strategies to mitigate these losses, such as increasing material resistivity and using layered structures, are discussed. The lecture emphasizes the importance of understanding eddy currents in electrical conductors subjected to variable magnetic fields, highlighting their impact on efficiency and the need for effective loss reduction techniques.