The paper introduces an electronic device named 'Blinker', which is suitable for laboratory work on topics related to electric current and resistance, as it allows the visualization of electric current. The Blinker is well suited for all levels of education if the activities are carefully selected. However, despite other devices used for measuring and estimating electric current, the Blinker can be assembled by middle and high school teachers or students. The device supports the conceptual development of knowledge and can be used to integrate knowledge about electricity across subjects. The paper describes how the Blinker works and presents a few basic applications for its use according to the curriculum for science, electrical engineering, and physics.