This second of 10 blocks of student and teacher materials for a secondary/postsecondary level course in electronic principles comprises one of a number of military-developed curriculum packages selected for adaptation to vocational instruction and curriculum development in a civilian setting. A prerequisite is the previous block. This block on AC circuits contains nine modules covering 44 hours of instruction on AC composition and frequency spectrum (7 hours); capacitors and capacitive reactance (6), magnetism (4), inductors and inductive reactance (5), transformers (4), relays (3), microphones and speakers (3), meter movements and circuits (5), and motors and generators (7). Printed instructor materials include a plan of instruction detailing the units of instruction, duration of the lessons, criterion objectives, and support materials needed. Student materials include a student text; nine guidance packages containing objectives, assignments, and review exercises for each module; and two programmed texts. A digest of the modules in the block is provided for students who need only to review the material. Designed for self- or group-paced instruction, the material can be adapted for individualized instruction. Additional print and audiovisual materials are recommended but not provided. (YLB)