Article Per Year (5 Year)
p-Index From 2021 - 2026
2.495
P-Index
This Author published in this journals
All Journal Jurnal MIPA Jurnal Geliga Sains: Jurnal Pendidikan Fisika Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya JPF (Jurnal Pendidikan Fisika) Universitas Islam Negeri Alauddin Makassar Science and Physics Education Journal (SPEJ) KONSTAN - JURNAL FISIKA DAN PENDIDIKAN FISIKA JURNAL PENGABDIAN KEPADA MASYARAKAT QARDHUL HASAN: MEDIA PENGABDIAN KEPADA MASYARAKAT Kasuari: Physics Education Journal (KPEJ) Jurnal Pengabdian Masyarakat Bumi Raflesia International Journal of Applied Technology Research Inovasi Pendidikan Fisika Abdimas Terapan: Jurnal Pengabdian Kepada Masyarakat Terapan Wahana Fisika : Jurnal Fisika dan Terapannya Jurnal Pendidikan Kimia, Fisika dan Biologi
Defrianto Pratama
Politeknik Negeri Bandung
Religion Aerospace Engineering Agriculture, Biological Sciences & Forestry Humanities Astronomy Automotive Engineering Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Computer Science & IT Control & Systems Engineering Decision Sciences, Operations Research & Management Earth & Planetary Sciences Economics, Econometrics & Finance Education Electrical & Electronics Engineering Energy Engineering Environmental Science Industrial & Manufacturing Engineering Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Library & Information Science Materials Science & Nanotechnology Mathematics Mechanical Engineering Physics Public Health Social Sciences Other

Published : 18 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 18 Documents
Search

 1   2 
The Effect of Capacitance on the Power Factor Value of Parallel RLC Circuits Hadiningrum, Kunlestiowati; Muldiani, Ratu Fenny; Pratama, Defrianto
Jurnal Internasional Penelitian Teknologi Terapan Vol 1 No 2 (2020): October 2020
Publisher : Bandung State Polytechnic (Politeknik Negeri Bandung)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.35313/ijatr.v1i2.27

Abstract

The power factor of the circuit is determined by the amount of pure resistance (R), self-inductance of the coil (L) and the capacitance of the capacitor (C). In this study, the measurement of the power factor value in a parallel RLC circuit was carried out through experimental testing and simulation with the value of C as the independent variable, while the values of R and L were fixed conditioned quantities. The purpose of this study was to determine the effect of capacitance on a parallel RLC circuit. One of the ways to improve the power factor value in a circuit is to install capacitive compensation using a capacitor. The relation between the power factor value and the capacitance and inductive reactance based on the experimental results and the simulation calculation results in the parallel RLC circuit both shows the same pattern with a relative uncertainty below 8%. The experimental results and simulation results both show that the power factor can be improved by using a right capacitance which is around the capacitance value when there is resonance in the circuit.
A Reduction in Undergraduate Misconceptions on AC Circuits through Interactive Simulations Pratama, Defrianto
Kasuari: Physics Education Journal (KPEJ) Vol. 8 No. 1 (2025): June 2025
Publisher : Universitas Papua, Jurusan Pendidikan Fisika FKIP Unipa

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.37891/kpej.v8i1.947

Abstract

Misconceptions are a major barrier in physics learning, particularly in abstract concepts such as alternating current (AC). This study aimed to reduce the number of students experiencing misconceptions on AC topics through PhET-assisted learning. The method used was a quasi-experimental one-group pretest-posttest design, involving 152 Electrical Engineering students enrolled in an Applied Physics course. The instrument employed was a four-tier test developed for six key AC concepts. Pretest results showed that 32.1% of students on average experienced misconceptions, with the highest found in the concept of resonance (50.0%). After instruction using PhET simulations, the average misconception rate dropped to 7.8%, with an average reduction of 24.3%. McNemar's test confirmed that the reduction was statistically significant (p < 0.05) across all concepts. PhET simulations proved effective by providing dynamic visualizations, enabling interactive exploration, and triggering cognitive dissonance that encourages conceptual revision. This study recommends the integration of interactive simulations in physics instruction, especially for abstract and dynamic topics.
Load-Dependent Copper Loss Analysis in Educational-Scale Transformers: An Experimental Approach Pratama, Defrianto
KONSTAN - JURNAL FISIKA DAN PENDIDIKAN FISIKA Vol 10 No 01 (2025): KONSTAN (Jurnal Fisika dan Pendidikan Fisika)
Publisher : Universitas Islam Negeri (UIN) Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20414/konstan.v10i01.671

Abstract

This study aims to experimentally investigate the effect of load resistance variation on copper loss and transformer efficiency at the laboratory scale. Two transformer configurations—step-up and step-down—were tested with load resistances ranging from 10 to 500 Ohms. Measurements of voltage, current, and power were taken on both the primary and secondary sides to calculate copper loss and efficiency. The experimental results demonstrate a nonlinear inverse relationship between load resistance and copper loss, consistent with theoretical predictions. The step-up configuration exhibited higher copper loss under low-load conditions, whereas the step-down transformer showed a more stable efficiency profile across varying loads. Statistical validation, as indicated by the coefficient of determination (R² > 0.98) and Root Mean Square Error (RMSE < 0.08 W), demonstrates a strong agreement between the theoretical models and experimental data, confirming the model's accuracy and the reliability of the experimental setup. These findings have practical implications for optimizing transformer loading strategies to reduce long-term energy losses and improve operational efficiency. Moreover, the results support the development of vocational education laboratory modules that link Theory with hands-on learning, enhancing students' understanding of real-world transformer performance and energy efficiency concepts. This study contributes to the field by validating a theoretical model with experimental data, highlighting critical load-loss relationships in transformer operation, and providing a practical framework for both industry applications and technical education.
Reduksi Miskonsepsi Mahasiswa pada Prinsip Kerja Kapasitor melalui Penerapan Simulasi PhET Pratama, Defrianto
IPF: Inovasi Pendidikan Fisika Vol. 12 No. 2 (2023): Volume 12 Nomor 2 Tahun 2023
Publisher : Universitas Negeri Surabaya

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

This study aims to reduce the number of students who have misconceptions about the working principle of capacitors. PhET simulations are used in lectures to overcome these misconceptions. Diagnostic test results using the Four-Tier Test show that an average of 41.3% of students experience misconceptions about each of the concepts tested. However, after the PhET simulation-assisted lectures were held, the average number of students who had misconceptions decreased to 6.9%. The McNemar test shows that there is a significant change in the number of students who have misconceptions about each concept after attending the PhET simulation-assisted lectures. Thus, these results indicate that the application of PhET simulations in lectures is effective in reducing student misconceptions about the working principle of capacitors. Keywords: Misconceptions, PhET, Capacitors, Four-Tier Test, Virtual Laboratory.
Penerapan Insinerator Sampah Sederhana dalam Mengatasi Masalah Penumpukan Sampah di Desa Sariwangi Defrianto Pratama; Rahmawati Hasanah; Yunita Citra Dewi; Destri Muliastri; Devi Eka Septiyani Arifin; Muhammad Rizki Zuhri; Zainuddin Zainuddin; Ajeng Ayu Milanti; Sri Widarti
ABDIMAS TERAPAN : Jurnal Pengabdian Kepada Masyarakat Terapan Vol. 3 No. 1 (2025): Juni: ABDIMAS TERAPAN: Jurnal Pengabdian Kepada Masyarakat Terapan
Publisher : Politeknik Kampar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.59061/abdimasterapan.v3i1.998

Abstract

Waste management is a major issue in Sariwangi Village, West Bandung Regency, due to the lack of public knowledge, skills, and awareness regarding technology-based waste processing. This problem is exacerbated by inadequate equipment and low community participation. To address these challenges, an incineration method was introduced through a community service program involving problem identification, literature review, awareness campaigns, waste separation, provision of equipment, and training on the use of waste processing technology. The program also developed strategies to enhance community involvement in waste management. The expected outcomes include improved knowledge and skills, availability of proper equipment, and increased awareness and participation in maintaining environmental cleanliness. This approach aims to create a cleaner, healthier, and more sustainable village environment. Keywords: Waste management; Incineration technology; Incinerator
Perbandingan Efisiensi Energi Genset Menggunakan Bahan Bakar Biogas dan LPG pada Berbagai Tingkat Beban Listrik Hadiningrum, Kunlestiowati; Muldiani, Ratu Fenny; Pratama, Defrianto
Jurnal Pendidikan Kimia, Fisika dan Biologi Vol. 1 No. 2 (2025): Maret : Jurnal Pendidikan Kimia, Fisika dan Biologi
Publisher : Asosiasi Riset Ilmu Pendidikan Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.61132/jupenkifb.v1i2.220

Abstract

Biogas is an alternative energy source that is environmentally friendly, cheap, easy to obtain and renewable. In general, all types of organic materials can be processed to produce biogas, however only homogeneous organic materials (solid and liquid) such as manure and urine (urine) of livestock are suitable for a simple biogas system. Biogas can be burned like LPG and on a large scale can be used to generate electricity, so that biogas can be used as an alternative energy source that is environmentally friendly and renewable. To determine the performance of biogas as an alternative energy source, in this research the method used is to compare the performance of Biogas with LPG gas as a source of electrical energy. Analysis of trial data per minute (RPM), with varying load levels, shows that the RPM of generators using LPG only decreases slightly as the electrical load increases, which shows that the generator is able to maintain more consistent performance. The RPM produced by LPG, which ranges from 2358 to 2420 RPM, indicates that the engine is running faster and more efficiently, while biogas has a lower RPM, ranging from 1715 to 1820 RPM, which indicates slower operation. LPG efficiency ranges from 89.60% to 98.12%, while biogas efficiency ranges from 74.67% to 89.60%. Even though biogas shows less stable performance than LPG, biogas still has potential as an alternative fuel, especially in areas that have limited access to LPG but have abundant sources of biogas raw materials. The use of biogas can reduce dependence on fossil fuels and reduce greenhouse gas emissions. Even though LPG is more efficient, biogas has significant potential to be developed as a more environmentally friendly alternative energy source because LPG relies on non-renewable fossil fuels and has a negative impact on the environment in the long term.
Reduksi miskonsepsi mahasiswa Teknik Elektro pada materi induksi elektromagnetik melalui laboratorium virtual PhET Pratama, Defrianto
Berkala Fisika Indonesia : Jurnal Ilmiah Fisika, Pembelajaran dan Aplikasinya Vol. 14 No. 2 (2023)
Publisher : Universitas Ahmad Dahlan

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.12928/bfi-jifpa.v14i2.26397

Abstract

Penelitian ini bertujuan untuk mereduksi jumlah mahasiswa Jurusan Teknik Elektro yang mengalami miskonsepsi pada 7 konsep Induksi Elektromagnetik. Laboratorium Virtual PhET digunakan dalam perkuliahan untuk mengatasi miskonsepsi. Penelitian ini menggunakan desain one-group pretest-posttest. Pretest dan posttest mengunakan soal diagnostik miskonsepsi Four-tier test. Hasil tes diagnostik miskonsepsi menggunakan Four-tier test menunjukan rata-rata sebanyak 39,86% mahasiswa mengalami miskonsepsi pada tiap konsep, kemudian setelah diterapkan kegiatan laboratorium virtual rata-rata jumlah mahasiswa yang mengalami miskonsepsi berkurang menjadi 10,71%. Uji McNemar menunjukkan bahwa terjadi perubahan yang signifikan jumlah mahasiswa yang mengalami miskonsepsi pada setiap konsep, setelah dilakukan kegiatan laboratorium virtual. Hasil tersebut menunjukkan bahwa penerapan laboratorium virtual PhET efektif dalam mereduksi miskonsepsi mahasiswa pada materi induksi elektromagnetik
MODELING LARGE-ANGLE PENDULUM OSCILLATIONS WITH QUADRATIC DAMPING AND DAMPING ON THE STRING Defrianto Pratama
JPF (Jurnal Pendidikan Fisika) Universitas Islam Negeri Alauddin Makassar Vol 10 No 2 (2022)
Publisher : Pendidikan Fisika UIN Alauddin Makassar

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24252/jpf.v10i2.29860

Abstract

This study aims to find the right theoretical approach for real pendulum oscillations with large angles and include the air damping factor. Video of real pendulum oscillations were analyzed using Tracker software, to obtain experimental data. The real pendulum motion equation is modeled by a second order nonlinear differential equation by including linear damping, quadratic damping and damping on the pendulum string. The pendulum motion equation is solved by the 4th Order Runge-Kutta method then the results are compared with the experimental data. Modeling by considering quadratic damping and string damping is closer to the real phenomenon of pendulum motion than only considering linear damping.
Co-Authors Ajeng Ayu Milanti Anny Suryani Chatarina Umbul Wahyuni Destri Muliastri Devi Eka Septiyani Arifin Dewi, Yunita Citra Farida Agoes Farida Agoes GANTINA, TINA MULYA Hadiningrum, Kunlestiowati Hasanah, Rahmawati Koesoemah, Nita Hernita Kunlestiawati Kunlestiawati Muldiani, Ratu Fenny Nita Henita Koesoemah nita henita koesoemah Siti Samsiyah Purwaningsih Sri Nur Yuliyawati Sri Nuryuliyawati Sri Widarti Sri Widarti YANTI SUPRIANTI, YANTI Zainuddin Zainuddin Zuhri, Muhammad Rizki