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เนื้อหาย่อ : Understanding Electricity and Electronics is a beginning text for electricity and electronics courses, either in the junior high school or in e early years of the senior high school. The xt provides the teacher with sufticient in- structional material for a full year's course. The book introduces the student to modern concepts of electricity and electronics and briefy traces the historical development of these concepts. It shows the relationship be- tween science and mathematics and begin- ng concepts in electrical technology. It also cludes basic information about the tools, aterials, and industrial processes common electrical and electronic work. The text courages students to plan electrical projects themselves; discusses the fundamental eories of electricity and electronics; shows ow these theories are applied in the fields of mmunications, transportation, construction anufacturing, and the development of elec- cal power; and discusses occupations in the electrical and electronics industries. The text is divided into 11 sections con- ining a total of 62 teaching units. Each it is followed by a group of carefully elected topics, For Review and Discussion, hich offer ample opportunity to review and ghlight the content of each unit. Where ppropriate, the units are supplemented by e or more suggestions on Testing Ideas About ctricity. These suggestions are experimental- activities that serve the purpose of saying, effect, "Now let's see how and why it really ." The experimental activities show the dose relationship between industrial arts and ence and thus, through practical experi- help the student to understand better scientific principles involved. This corre- on between the industrial arts and science been stressed throughout the text. Theo-retical material is, whenever possible, followed by one or more examples of its application to the operation of a common electrical or electronic device. In this way theory and practice reinforce each other. A word should be said about the experi- ment suggestions, Testing Ideas About Electricity. Each has been designed for inexpensive con- struction with materials found in the typical industrial arts shop or laboratory. The experi- ments can be used for group demonstration or for individual student work. The units within each section are further strengthened by Extra-credit Assignments. These assignments are presented as sugges- ions to encourage students to seek additi information about topics they have studied. Section Eleven contains suggestions for 24 take-home projects, which are designed to provide a variety of experiences. In addition, in Appendix B there are suggestions for plan- ning electrical projects, and Appendix C con- tains detailed instructions for the design and construction of small power transformers. The text is written and organized with emphasis on the illustrative method of in- struction. Each of the several hundred illus- trations has been selected and used with this purpose in mind. Every effort has been made present the student with modern ideas to about electricity and electronics and to show how these ideas are used by industry. In ad- dition, consumer education has been given attention. Safety and careful work habits are stressed whenever necessary. The authors and publisher will be glad to receive any comments or suggestions for the improvement of this volume.