The aim of this study is to investigate the cognitive structures of physics teacher candidates about "electric field." Phenomenographic research method, one of the qualitative research patterns, was used in the study. The data of the study was collected from 91 physics teacher candidates who had taken General Physics II course at Education Faculty of a university in Anatolia. The stimulus word, "electric field" has been presented to teacher candidates through Free Word Association Test (FWAT). The totally 43 responses obtained from FWAT were presented as frequency tables. The responses were divided into 13 categories by the content analysis. A concept network which reveals cognitive structure of physics teacher candidates about "electric field" was created considering frequencies and categories. According to results of the study, the highest frequency values related with "electric field" which stimulus of physics teacher candidates were power, charge, vector/vectoral quantity, current, magnet, etc. and the categories with the highest frequency of response words were figured out as electrical force, electric charge, magnetic field and magnitude of electric field, etc.