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This is an aid to clarifying the similarities among the basic quantities of physics in the various energy systems (mechanical, fluid, electromagnetic, thermal) and effective applications to the maintenance, modification and repair of complex technical systems. Within this Unified Technical Concepts approach (UTC), chapters begin with a development of the relevant basic physics and then identify the concept as a unifying principle that is extended to a variety of problems in mechanical, fluid, electromagnetic and thermal systems. Laboratory exercises enable the student to observe the physical principles that are presented. Included are discussions of the electromagnetic energy system and a chapter on optics and lasers.