As a part of the unit materials in the series produced by the Australian Science Education Project, this teacher edition is primarily composed of a core relating to simple circuits, a test form, and options. Options are given under the headings: Your Invention; "How Long Does a Call Last?"; One, Two, Three Wires; Parallel Circuits; More Cells; The Long and the Short of It; Investigating a Light Globe; Hot Stuff; A Carbon Arc; and Wires in the Wall. All students are required to do the core. Behavioral objectives are given to facilitate acquisition of outcomes. Also included are recommendations for use of the unit, lists of equipment and audio-visual aids, hints on equipment and class organization, a bibliography of references, a questionnaire for teacher comments, symbols of electric components, a glossary, and keys to questions and test items. The accompanying record book is intended for students to record observations and answers and summarize their activities. (CC)