All electrical gadgets and gizmos need an electric current to work. To make it easier to learn about and make circuits, you will need to know the symbols for some components. In this chapter, you will learn about these symbols and then plan and build simple electric circuits. You will also measure the electric current using basic units of electricity. Teacher background information, assessment, safety notes, references, and additional resources are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, An Introduction to Phenomenon-based Learning, Appendix, Image Credits, and Index.