Teaching Circuits with Computer Fans - a Retrospective

For nearly a decade, we have explored using small computer fans as an effective method for teaching simple resistive circuits both qualitatively [1] and quantitatively [2]. The current through the fans is related to the rotational speed of the fans and allow multiple senses to be engaged (touch, sight, and hearing). The linear relationship between the operational current and applied voltage provides a nearly constant effective resistance for the fan. We have also demonstrated that fans can also be used to explore RC circuits both qualitatively and quantitatively, where the fans act as the resistive elements as well as the indicator [3]. In this presentation, we overview teaching circuits using computer fans focusing on lessons learned, including finding student engagement, finding computer fans that work, and future directions.