The purpose of the current research was to determine the opinions and alternative concepts of the pre-service science teachers about the functions of the elements found in a simple electric circuit. The current research was carried out with the participation of the first-year students attending the Science Teaching Department of a state university located in the western part of Turkey in 2016-2017, 2017-2018 and 2018-2019 academic years. As the data collection instrument of the current research, a qualitative research-based questionnaire was used. In the analysis of the collected data, the content analysis method was used. As a result, it can be said that; the pre-service science teachers have alternative concepts about the functions of the elements found in a simple electric circuit. It can be also said that the simple electric circuit and the functions of the elements found in this circuit have not been thoroughly understood by the pre-service science teachers.