부산대학교 도서관

The concept of voltage is difficult for students to understand. The main reason of its difficulty might be attributed to the fact that the concept of voltage indicating a behavior of charged particle (electron) is not shown in the learning process of voltage. In this study we intend to work out "a model of density. of electric charge" which illustrates how electron composes voltage, using charging small balls made of formed polystyrene as the model of electron. With this "a model of density of electric charge", we were able to carry out the experiment that achieves the following purposes. (1) To show students the interaction between electrons by changing the density of electron. (2) To show them the influence of the density of electron on Coulomb force. (3) To show them the influence of the density of electron on electronic field. To clarify the effects of the model described above, we tried two demonstration lessons using this model. The result showed that "a model of density of electric charge" was effective on the development of the concept of voltage for students.