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Siti Nurul Khotimah
Institut Teknologi Bandung
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Education Materials Science & Nanotechnology Physics

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Identifikasi Miskonsepsi Siswa Menggunakan Tes Diagnostik Six Tier dengan CRI (Certainty of Response Index) pada Materi Gelombang Auvi Winandri Utami; Siti Nurul Khotimah
Jurnal Penelitian Pendidikan IPA Vol 9 No 7 (2023): July
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v9i7.4192

Abstract

The concept of waves is essential in physics learning. This study aims to obtain a six-level diagnostic test instrument accompanied by a Certainty of Response Index (CRI) and use it to identify students' level of conceptual understanding and misconceptions on wave material. This study used the Research and Development (R&D) method with a sample of 220 students. Misconception data was obtained using a misconception test in the form of multiple-choice questions. There are 32 questions with six stages consisting of multiple choices answer, the level of confidence in choosing answers, the source of answer choices, the choice of reasons in answering questions, the level of confidence in selecting causes, and the source of students' reasons in answering the questions. The results showed that the percentage of students who experienced misconceptions in the whole question was 36%. Students who understood the concept was 30%, and 34% of students did not understand the concept. In addition, 61% of students chose answers and reasons for solutions based on personal opinions. The conclusion is that misconceptions are caused by student errors in applying the concepts received in the given problem, and students tend to choose the correct answers and reasons when the issue presented is equipped with a picture and only requires one step to get the correct answer.
Optimasi Sistem MagnetoHydrodynamics (MHD) Sederhana untuk Aplikasi Aliran Fluida Hawinda Restu Putri; Bekti Afre Ratri; Nining Kusumastuti; Siti Nurul Khotimah
Jurnal Penelitian Pendidikan IPA Vol 11 No 5 (2025): May
Publisher : Postgraduate, University of Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jppipa.v11i5.10598

Abstract

Magnetohydrodynamics (MHD) studies the relationship between electromagnetism and fluid mechanics, a concept with various practical applications, including marine propulsion systems and electromagnetic pumps. This study aims to optimize a simple MHD system to improve the performance of fluid rate measurement based on electromagnetic principles. Optimization is carried out through the analysis of the influence of variations in several system characteristics, namely the given electrical voltage, the distance between electrodes, the length of the electrode, and the salinity of the saltwater. The method employed is experimental, utilizing a simple MHD system design that enables the quantitative observation of changes in the speed of saltwater resulting from the interaction between magnetic and electric fields. The speed of saltwater is measured using a visual approach with the Tracker analysis application. The results showed that increasing the voltage and salinity of the saltwater, as well as decreasing the electrode length or the distance between electrodes, all contribute to increasing the speed of saltwater flow. In other words, each parameter makes a significant contribution to fluid dynamics, thereby allowing for the optimal configuration of the MHD system. The findings in this study are expected to serve as the basis for the development of simple MHD-based fluid rate measurement instruments that are efficient and applicable, enabling a concrete illustration of electromagnetic theory and fluid dynamics.
Co-Authors Auvi Winandri Utami Bekti Afre Ratri Hawinda Restu Putri Nining Kusumastuti