WIRIS quizzes are an online mathematics tool for educational purposes that upgrade Moodle quizzes and allow the development of personalized quizzes using random data and conditional instructions. WIRIS quizzes can be used in any mathematics or science degree; their complex operators allow it to be used to solve electrical circuits. This tool promotes autonomous student learning and enables teachers to monitor that learning and make adjustments if necessary. Therefore, this tool improves teaching quality. It can also be used as an assessment tool by both the teacher and the student. This paper shows how WIRIS quizzes have been integrated into the virtual campus of the Polytechnic University of Catalonia (UPC), Spain, to teach electrical circuits. Lessons learned in performing and using WIRIS quizzes with second-year students at the UPC are shown. (Contains 9 figures and 1 table.)