The present study was conducted to analyze the understanding level of the prospective teachers studying in the second grade of elementary mathematics undergraduate program, on the topic of electric charge which is taught in compulsory Physics II. Totally 45 prospective teachers, 36 women and 9 men, have participated the study. The data of the study were obtained through a feedback form including four different open ended questions, which were prepared by the researcher based on expert opinion. The answers given to the open-ended questions by the prospective teachers were read and analyzed, and grouped according to their content, similarity and closeness. The grouped answers, the number of the prospective teachers writing the answering and their percentages were entered in relevant tables created and the required evaluations are performed. The fact that 22.1% of the prospective teachers do not know that a matter is loaded with electric charge, 62.1% of them do not know that a matter with electric charge can attract another applicable neutral matter, 60.0% do not know grounding of an electric charged matter and 86.7% do not know that electric charge has quantum property show that their understanding level on the static electricity topic is very low. The fact that generally a high percent of the prospective teachers not knowing electrical charge and its properties, a basic topic taught in elementary and secondary school and at the university, brings the requirement of using methods and activities enabling the students to be active rather than a teacher and centred teaching system in the physics courses in undergraduate programmes. The prospective teachers who have performed learning-purpose writing activities stating in the studies that they have better understood and learned physics topics on which they have written letters or summaries brings the opinion of using these activities for teaching the topic of electrostatic.