Montagem experimental de um relé fotoelétrico didático para o ensino médio

Abstract

In Brazil, Modern Physics teaching has not received real attention on the school planning. Even though that this is a required content. As consquence of this fact the most students have presented difficulties to discuss and reflect on the concepts related to technological advances. Another substantial problem that we can point out is that there isen't any approach into the experimental classes in the public schools. With this in mind, we propose an experimental assembly work that might be favorable to enhance brief discussions involving some important topic of Modern Physics directly related with photoconductivity. To achieve these propose, we use some experimental apparatus: the Reverse Presence Sensor, Didactc Photoelectric Relay (prepared by students) made from pre-prepared scripts and Industrial Photoelectric Relay (prepared by the teacher). Such experiments were subsidiary assembling the Didactic Photoelectric Relay and the discussions that showed the influence of light on the material and its consequences for the electrical parameters: current, voltage, resistance, resistivity and conductivity. We noticed that into the classe using this new approach the effective participation of students on the issues presented considerably increased. Through these actions, the most of students were able to formulate coherent oral and written responses. It is noticeable the contribution of experimental classes for teaching physics, which allows for students the new experience into the classroom. Moreover, the students have a opportunity to know more about the applications inherent to technological advances.