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We present a smart sensor system meeting these requirements for STEM (science, technology, engineering, and mathematics) experiments in electrical circuits. The system consists of custom experiment boxes and cables combined with an application for the Microsoft HoloLens 2, which creates an AR experiment environment. The boxes combine sensors for measuring the electrical voltage and current at the integrated electrical components as well as a reconstruction of the currently constructed electrical circuit and the position of the sensor box on a table. Combing these data, the AR application visualizes the measurement data spatially and temporally coherent to the real experiment boxes, thus fulfilling demands derived from traditional multimedia learning theory. Following an evaluation of the accuracy and precision of the presented sensors, the usability of the system was evaluated with n=20 pupils in a German high school. In this evaluation, the usability of the system was rated with a system usability score of 94 out of 100.<\/jats:p>","DOI":"10.3390\/s22010256","type":"journal-article","created":{"date-parts":[[2021,12,30]],"date-time":"2021-12-30T23:29:07Z","timestamp":1640906947000},"page":"256","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":12,"title":["Smart Sensors for Augmented Electrical Experiments"],"prefix":"10.3390","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1052-8901","authenticated-orcid":false,"given":"Sebastian","family":"Kapp","sequence":"first","affiliation":[{"name":"Physics Education Research Group, Department of Physics, Technische Universit\u00e4t Kaiserslautern, 67663 Kaiserslautern, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5935-4872","authenticated-orcid":false,"given":"Frederik","family":"Lauer","sequence":"additional","affiliation":[{"name":"Microelectronic Systems Design Research Group, Department of Electrical and Computer Engineering, Technische Universit\u00e4t Kaiserslautern, 67663 Kaiserslautern, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8831-755X","authenticated-orcid":false,"given":"Fabian","family":"Beil","sequence":"additional","affiliation":[{"name":"Physics Education Research Group, Department of Physics, Technische Universit\u00e4t Kaiserslautern, 67663 Kaiserslautern, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5132-3799","authenticated-orcid":false,"given":"Carl C.","family":"Rheinl\u00e4nder","sequence":"additional","affiliation":[{"name":"Microelectronic Systems Design Research Group, Department of Electrical and Computer Engineering, Technische Universit\u00e4t Kaiserslautern, 67663 Kaiserslautern, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Norbert","family":"Wehn","sequence":"additional","affiliation":[{"name":"Microelectronic Systems Design Research Group, Department of Electrical and Computer Engineering, Technische Universit\u00e4t Kaiserslautern, 67663 Kaiserslautern, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6985-3218","authenticated-orcid":false,"given":"Jochen","family":"Kuhn","sequence":"additional","affiliation":[{"name":"Physics Education Research Group, Department of Physics, Technische Universit\u00e4t Kaiserslautern, 67663 Kaiserslautern, Germany"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,30]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"405","DOI":"10.1108\/03055720810917679","article-title":"The depth of knowledge: Surface, shallow or deep?","volume":"38","author":"Bennet","year":"2008","journal-title":"VINE"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"47","DOI":"10.1159\/000097684","article-title":"Conceptual Change and Education","volume":"50","author":"Vosniadou","year":"2007","journal-title":"Hum. 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