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All Journal JURNAL MathEdu (Mathematic Education Journal) Jurnal ELKO (Elektrikal dan Komputer)
Mey Chyntia Yesaya
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Computer Science & IT Control & Systems Engineering Education Electrical & Electronics Engineering Energy Engineering Mathematics

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THE EFFECT OF GEOGEBRA-BASED INSTRUCTION ON THE CONCEPTUAL UNDERSTANDING OF LINEAR ALGEBRA AMONG INFORMATICS ENGINEERING STUDENTS Mey Chyntia Yesaya; Sri Widyanti Ginting; Melda Dahoklory
JURNAL MathEdu (Mathematic Education Journal) Vol 9 No 2 (2026): JURNAL MathEdu (Mathematic Education Journal) Juli 2026
Publisher : Program Studi Pendidikan Matematika Institut Pendidikan Tapanuli Selatan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37081/mathedu.v9i2.8421

Abstract

The integration of digital technology into mathematics education has become an essential strategy for improving students' conceptual understanding, particularly in abstract subjects such as Linear Algebra. GeoGebra, an interactive mathematical software, provides dynamic visualizations that enable students to explore mathematical concepts more effectively. This study aims to examine the effect of GeoGebra-based instruction on the conceptual understanding of Linear Algebra among Informatics Engineering students. A quantitative approach employing a quasi-experimental design with a pretest–posttest control group was used. The participants consisted of undergraduate Informatics Engineering students enrolled in a Linear Algebra course, divided into an experimental group receiving GeoGebra-based instruction and a control group receiving conventional instruction. Data were collected using a conceptual understanding test administered before and after the intervention. The data were analyzed using descriptive statistics and an independent samples t-test to determine significant differences between the two groups. The findings indicate that students who learned through GeoGebra-based instruction demonstrated significantly higher conceptual understanding than those who received conventional instruction. The dynamic visualization and interactive features of GeoGebra facilitated students in exploring vector operations, matrix transformations, and systems of linear equations, thereby strengthening their conceptual comprehension and problem-solving abilities. These results suggest that GeoGebra is an effective instructional tool for enhancing conceptual understanding in Linear Algebra courses, particularly for Informatics Engineering students. The study recommends integrating GeoGebra into higher education mathematics curricula to promote active learning and improve students' mathematical competence.
ANALISIS PENGARUH BEBAN PUNCAK TERHADAP EFISIENSI TRANSFORMATOR DI GARDU INDUK 150 KV WAYAME Joelfandro Lelapary; Arnold James Kastanja; Mey Chyntia Yesaya
Jurnal ELKO (Elektrikal dan Komputer) Vol. 7 No. 1 (2026): Jurnal Elko
Publisher : Politeknik Negeri Ambon

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54463/zr2m7898

Abstract

  Penelitian ini berfokus pada analisis dampak pengaruh beban puncak terhadap tingkat efisiensi transformator berkapasitas 30 MVA yang terletak di Gardu Induk 150 kV Wayame. Studi dilakukan dengan menggunakan representasi diagram satu garis (single line diagram) sebagai model kajian. Dalam pengumpulan data, tiga variabel utama yang menjadi parameter pengukuran mencakup besaran tegangan, variasi beban, serta intensitas arus yang mengalir pada transformator Penelitian ini menganalisis performa dua unit transformator (trafo) berdasarkan efisiensi operasionalnya pada periode siang dan malam hari. Pada trafo 1, pengukuran siang hari menunjukkan efisiensi 99,649% pada beban minimum 5,4 MW dan meningkat menjadi 99,687% saat beban puncak 6,5 MW. Sedangkan pada malam hari, efisiensi mencapai 99,654% dengan beban minimum 5,6 MW dan 99,726% pada beban puncak 7,5 MW. Untuk trafo 2, pengukuran siang hari mencatat efisiensi 99,555% pada beban minimum 4,1 MW dan 99,632% saat beban puncak 5,1 MW. Sementara pada malam hari, efisiensi tercatat 99,561% dengan beban minimum 4,2 MW dan meningkat menjadi 99,621% pada beban puncak 5,3 MW. Hasil penelitian menunjukkan bahwa kedua trafo memiliki tingkat efisiensi yang sangat baik di atas 99,5%, dengan kecenderungan peningkatan efisiensi seiring bertambahnya beban. Trafo 1 secara konsisten menunjukkan efisiensi yang lebih tinggi dibandingkan trafo 2 dalam berbagai kondisi pembebanan. Kata kunci: transformator, efisiensi, beban puncak
Co-Authors Arnold James Kastanja Joelfandro Lelapary MELDA DAHOKLORY Sri Widyanti Ginting