Sirait, Judyanto. “Analysis of First-Year University students’ Conceptual Understanding of Direct Current Electric Circuits”. Jurnal Pendidikan Informatika dan Sains 15, no. 1 (June 30, 2026): 31–38. Accessed July 28, 2026. https://journal.upgripnk.ac.id/index.php/saintek/article/view/10012.