Lecture, three hours; discussion, one hour. Enforced requisite: Electrical Engineering 101A or Physics 110A. Senior-level introductory course on electrodynamics of ionized gases, with emphasis on fundamental processes relevant to laboratory, space, and astrophysical plasmas. Examples mostly from space, planetary, and astrophysical plasmas, stellar winds, planetary magnetospheres, and radiation belts. Other applications include materials processing, generation of coherent radiation, particle beams, and fusion energy production. Letter grading.