This study investigated the influences of inadequate instructional materials and facilities in the teaching and learning of electrical/electronics (E/E) technology education courses. The study was guided by two research questions and two null hypotheses which were tested at 0.05 level of significance. The design employed was descriptive survey with a population of 56 Electrical/Electronic teachers and students. Due to this few population size no sampling was carried out. Validated questionnaire with 0.89 reliability coefficient was used for data collection. The collected data were analyzed using mean and standard deviation to answer the research questions while t-test statistic was used to test the hypotheses. Findings made were that inadequate instructional materials and facilities often influence the teaching and learning of Electrical/Electronic technology courses in 32 negative ways. Based on these finding, it was recommended that all concerned should join hands to adequately provide effective and efficient instructional materials and facilities in order to eradicate all the negative influences of inadequate instructional materials and facilities.