The purpose of this assessment probe is to elicit students’ ideas about household (AC) current. The probe is designed to reveal students’ ideas about what happens when a two-pronged plug is placed in an outlet. If a two-pronged plug is available, show students the plug. It is best used with middle and high school students. A materials list, teacher notes, standards, assessment, safety notes, and references are provided. This book selection also includes the Table of Contents, Preface, Acknowledgments, About the Authors, Introduction, and Index.