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All Journal INDONESIAN JOURNAL OF APPLIED PHYSICS Jurnal Pengabdian Papua
Soll, Melfi
Unknown Affiliation
Humanities Astronomy Energy Languange, Linguistic, Communication & Media Materials Science & Nanotechnology Medicine & Pharmacology Physics Other

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PEMBUATAN ALAT PERAGA SEDERHANA UNTUK MEMAHAMI SIFAT-SIFAT CAHAYA BAGI KELOMPOK ANAK SEKOLAH DASAR DI SENTANI KABUPATEN JAYAPURA Radjabaycolle, Flinn; Bungkang, Yusuf; Bunga, Martina; Soll, Melfi
JURNAL PENGABDIAN PAPUA Vol 8 No 2 (2024)
Publisher : LPPM Uncen

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31957/jpp.v8i2.3546

Abstract

Children who live in Perumahan BTN Puskopad Jalur 7 Bawah Sentani, Kabupaten Jayapura, experience difficulties learning physics. One of the factors causing this is the lack of sufficient support from the school environment and family. Parents hand over all teaching responsibilities to teachers, while teachers at school cannot teach optimally. Teachers only depend on textbooks, and children are forced to memorize lesson material according to what is written in the book. Children are also unable to carry out practical work as they should because of inadequate laboratory equipment. This style of learning makes it difficult for children to understand physics well. To learn physics, children need concrete scientific experience. Based on this background, the community service team held activities by making simple teaching aids related to the subject matter of light. Children are expected to be able to understand the properties of light, namely that it can travel in a straight line, can penetrate transparent surfaces of objects, can be reflected, and can be refracted. Apart from that, it is also hoped that children will be interested in physics lessons through this activity. This service is carried out using experimental methods with tools and materials that are easily found in everyday life. The benefit of this service is that it provides knowledge for children when studying the properties of light in science subjects at formal schools. The results achieved from this service activity show that the service participants understand the properties of ligh t, are satisfied and happy while carrying out light experiments, and as many as 75% of children are interested in studying physics.
Performance Enhancement of Biobattery from Tropical Almond Paste Using Acetic Acid Addition Rumbino, Graziani; Maniambo, Lili; Soll, Melfi; Dirgantari, Gemala; Togibasa, Octolia
INDONESIAN JOURNAL OF APPLIED PHYSICS Vol 13, No 1 (2023): April
Publisher : Department of Physics, Sebelas Maret University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.13057/ijap.v12i2.61245

Abstract

Biobattery is an alternative energy device that uses organic waste without hazardous chemicals. It is further reported that tropical almond (Terminalia catappa L.) is rich in glucose content, making it a potential electrolyte for a biobattery device, although the power performance is not optimal. Therefore, this research aims to improve the performance of biobattery from tropical almond paste with the addition of acetic acid. Biobattery cells were constructed using the galvanic cell method, while the tropical almond paste as an electrolyte was stored in a box container with a volume of 600 cm³, then attached with copper and zinc metal plate as cathode and anode. Five typical devices of biobattery were made with various acid concentrations of 0%, 10%, 20%, 40%, and 80% which were added to the electrolyte. The results showed a significant enhancement of power performance, from 0.25 mW without any acid up to 1.62 mW with acid addition. The biobattery from tropical almond paste added with acetic acid of 20% had the best performance. Based on the results, the characterization of this device had an open cell voltage of 0.93, and the power curve showed a peak value of 1.62 mW at a current of 3.29 mA, with a stable current lasting up to 200 hr.
Co-Authors Bunga, Martina Bungkang, Yusuf Dirgantari, Gemala Flinn C Radjabaycolle Maniambo, Lili Octolia Togibasa Rumbino, Graziani