The purpose of this study was to examine pre-teachers' conceptual understanding of electricity. To
fulfill the purpose of this study, 24 pre-service teachers were requested to solve some problems about
electric circuit and electrostatic force. The results were as follows: Pre-service teachers solved well the
electric circuit problems, but they had difficulties in incomplete circuit. In the electrostatic problem,
some pre-service teachers had difficulties in solving the relation between electrostatic force and tension
or gravity. And some pre-service teachers did not consider action and reaction.
