An investigation ofthe effectiveness of using analogies to develop a robust understanding of direct current (DC) electric circuits in first-year university students

The effectiveness of using a teaching strategy, based on analogies for direct current electric circuits, to attempt to address first-year underprepared university students was investigated. The study consisted of 53 participants drawn from the Faculty of Health Sciences at Nelson Mandela University. A quantitative research design was adopted using the “Determining and Interpreting Resistive Electric Circuits Concepts Test” (DIRECT) version 1.2 as a research instrument. The DIRECT is a 29-item multiple-choice test with only one correct answer in each question. The DIRECT was modified to further probe students’ confidence levels in their answers. The instrument served as a pre-test prior to the start of the formal lessons on direct current electric circuits. At the end of a five-week treatment period, the same instrument was administered to all participants as a post-test. The statistical analysis and interpretation of the preand post-test data were conducted using Software Package for Social Sciences (SPSS) version 23 and STATISTICA version 12. In answering the main research question (How can a misconception-based module, using analogies,positively influence(or not)academically under-prepared first-year non-major Physics students’ conceptual understanding of direct current(DC)electricalcircuits?)and sub-questions thereof, the students’ mean scores between the pre-and posttest were calculate and compared using t-test at a significant level of 0.05. The results revealed a statistically significant difference between the preand post-test mean scores. The pre-test mean score was 22.24 with a standard deviation of 8.07. The post-test mean score was 38.68 with a standard deviation of 13.93. The mean score difference between the post-test and pre-test was 16.44 with a standard deviation of 13.82 at p-value less than 0.05. The results from the pre-test suggest that students held very strong alternative conceptions on direct current electric circuits. The post-test results also revealed that some alternative conceptions were still held onto after the intervention. There wasno statistical significant difference found between the students’ correct answers and their confidence levels. The quantitative analysis of the results suggested that there is a positive change between the post-testmean score and pre-test mean score and this change is statistically significant (p < 0.05). The results showed sufficient evidence to conclude that analogies-based teaching strategy was a vieffective means of reducing the number of alternative conceptions the students held about direct current electric circuits. The study recommended the need to ascertain out what the students felt about the improvement of their understanding of direct current electric circuits concepts. The study suggested a qualitative research methodology as an area for future research