The aim of this study is to observe the effect of computer assisted instruction (CAI) with simulation techniqueused in teaching the subject of “Electric Current” on the successes of students. In the study pretest-posttestcontrol group quasi-experimental method was used. 28 students of 11th grade in the department of chemistry inan industrial vocational school in Izmir-Konak formed the study group; later on one experiment (n=14) and onecontrol group (n=14) were formed of these students. 16 open-ended questions about electric current wereprepared as data collection tool. Pretests were applied on groups a week before the application of activities.“Electric Current” was taught to experiment group using CAI technique and to control group with traditionalteaching methods. Posttests were applied one week later the application of activities. In the analysis of dataMann Whitney U-test and Wilcoxon signed rank test which are both non-parametrical, were used. At the end ofthe study it was detected that of the two groups whose successes were the same at the beginning, experimentgroup students on whom CAI method was applied came out more successful than control group on whomtraditional method was applied. We can result that CAI technique increase the academic successes of students inthe subject of “Electric Current”.