2025 Volume 65 Issue 3 Pages 697-708
In this study, naive concepts regarding the power consumption of electrical resistance in the ‘Electricity and Magnetism’ unit of upper secondary school physics were elicited, and teaching materials and an instructional program were developed and implemented to clarify and correct these concepts. First, a pre-learning concept survey on the power consumption of electrical resistance revealed that many students have naive concepts such as ‘the higher the resistance value, the higher the power consumption’. To help students modify these naive concepts and form scientific concepts, conductive thermo agar, which can visualize the generation of Joule heat due to electrical resistance in the form of color changes, was developed and used in the experiment in this study. The results of pre-, post-, and delayed surveys of the experimental and control groups showed that the educational program using conductive thermo agar was effective in modifying the students’ naive concept and in successfully acquiring and maintaining scientific concepts.
