Prevalence and consistency of student ideas on simple dc circuits: A comparison between high school and undergraduate students

This study compares conceptual understanding, as well as the prevalence and consistency of student ideas regarding simple dc circuits, between two distinct groups: high school students after initial instruction ( N = 1 2 7 4 ) and undergraduate students in physics-related degree programs before attending university lectures ( N = 423 ). To investigate student ideas, we employed the 2T-SEC test, a two-tier multiple-choice instrument. Results show a significantly higher conceptual understanding among undergraduates (Cohen’s d = 0.9 6 ). However, the overall prevalence of specific student ideas appears to be similar across both groups: of the 13 student ideas examined, 5 occur equally often, 4 are more frequent among high school students, and 4 among undergraduates. Notably, certain ideas well documented in the literature, such as “sequential reasoning” and “current consumption,” are significantly more prevalent among undergraduates. Consistency analyses reveal generally low levels across both groups, with few significant group differences. Moreover, these findings suggest that everyday experiences and language may reinforce certain student ideas over time.