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Ratna Dwi Rahayu
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Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Electrical & Electronics Engineering Industrial & Manufacturing Engineering Mechanical Engineering

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Miskonsepsi Mahasiswa Menggunakan Four-Tier Diagnostic Test Ratna Dwi Rahayu
SIMETRIS Vol 15 No 2 (2021): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v15i2.223

Abstract

In physics learning, it is not uncommon to find misconceptions experienced by students, including the Dynamic Fluids sub-material, namely the Principle of Continuity. This study aims to identify misconceptions that occur in the Continuity Principle teaching material and identify concept weaknesses as the cause of the Continuity Principles teaching material and identify conceptual weaknesses as the cause of these misconceptions. The study was conducted on 37 students at Seolah Tinggi Tenologi Ronggolawe majoring in Mechanical Engineering with one shoot research method. Diagnosis of student misconceptions is carried out using a four-tier diagnostic test instrument which is the development of a three-tier test instrument by adding the level of confidence in the answers to the third tier. The results of the diagnosis show that students experience misconceptions in the Continuity Principles sub-material by 28%, students who understand partly 35%, students who understand concepts only 6%, students who do not understand concepts by 30% and students who cannot be coded 0%. Based on the results of observations in learning and analysis of the answers to the third and fourth tiers, the misconceptions that occur are generally caused by students' inaccurate logic, namely students assume that a fluid with a high velocity has a large fluid pressure, and vice versa.
Hasil Belajar Fisika Melalui Pembelajaran Daring Ratna Dwi Rahayu
SIMETRIS Vol 16 No 1 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i1.239

Abstract

The online learning paradigm becomes an alternative at every level of education today. This study aimed to describe students' physics learning outcomes through online learning. The study, which involved 47 students Sekolah Tinggi Teknologi Ronggolawe Cepu Departmen of Mechanical Engineering Semester 1 , used observation sheet to collect data related to the online learning. Besides, the documentation of students' physics learning outcomes scores was collected to be analyzed by using descriptive statistics. The results of this study indicated that the average score of students’ physics learning outcomes through online learning was in Very Good category. Another finding from this study was that there were still 11% of students who needed physics tutoring. Thus, further research could explore the factors that hindered students' current understanding of physics learning.
PENINGKATAN ARUS LISTRIK DAN TEGANGAN LISTRIK KELUARAN SEL SURYA DENGAN MENGGUNAKAN REFLEKTOR Ratna Dwi Rahayu
SIMETRIS Vol 16 No 2 (2022): Simetris
Publisher : Sekolah Tinggi Teknologi Ronggolawe Cepu

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.51901/simetris.v16i2.269

Abstract

The output solar cells in the form of electric current and voltage as an alternative energy source can be increased by increasing the intensity of the light that falls on the surface of the solar cell. The intensity of light falling on the solar cell can be magnified by using a reflector. This article analyses in the magnitude of the electric current and voltage output of solar cells using a reflector in the form of a flat mirror at a mirror angle of 600 and a concave mirror with a focal length of 20 cm againt the output of a solar cell without a reflactor. The measurement results show that there ia a greater increase in output by using a flat mirror compared to using a concave mirror as a reflector. Increasing the magnitude of the electric current and output voltage of solar cells with a flat mirror as a reflector to the electric current and output voltage of solar cells without reflectors was 3,54 % and 29,28 %, respectively on the use of a concave mirror as a reflector of 1,7 % and 9,98 %.
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