This revised trial version of ED 061 083 is a unit of the Australian Science Education Project materials for grades seven through ten in Australian secondary schools. It is intended for students in the concrete operations stage of intellectual development. It provides activities to give students a broad introduction to the concept of energy, which is treated as a model that scientists find useful to explain change. The teacher's guide to the unit is an annotated copy of the student manual, giving ideas for assisting students to develop the concept, lists of apparatus required, and suggested references for students and teachers. All students are expected to complete the introductory unit and then to choose one or more of the five options: "Stored Energy,""Energy and Life,""Energy Converters,""Combustion," and "Using the Energy Fuels." Each option contains instructions for numerous activities, poses questions to be answered in the student workbook, and provides background information. Diagnostic tests and lists of correct answers, with discussions of the incorrect choices, are included in the student's booklet. (AL)