The purpose of this study is to produce android-based GES-Math learning media on the material of a two-variable linear equation system (TVLES) and to know the validity, effectiveness, and practicality of the learning media in increasing students' interest and motivation. This research includes research and mining (R&D). The development model used in this study is 4D (Four D Models) consisting of 4 stages of development, including: define, design, development, and disseminated. This android-based GES-Math learning medium was developed with the help of an articulate storyline application. The subject of this study is Gowa State Junior High School. The learning media trial was conducted twice, namely a small-scale trial followed by 6 students from grade VIII-2 and a largescale trial followed by all grade VIII-2. The instruments used in this study are media validation sheets by validators, study result tests, and student response questionnaires. Based on the validation results obtained an average of 4 (very valid). While the results of the analysis of the questionnaire response of students obtained an average result of 3.9 (very practical). Meanwhile, the intermediate test of study results obtained by 86 means that the resulting product is already eligible for use because it meets the criteria of validity, practicality, and effectiveness.
The electric panel has a function as a distribution device and as protection for electricity from the PLN. A panel must at least have protective equipment that functions so that if a fault occurs in electrical equipment, the fault can be corrected and does not interfere with the performance of the panel. In order for the protection equipment to work properly, accuracy is required in selecting the current rating and breaking capacity value of the protection components used. The purpose of this research is to analyze the breaking capacity value, nominal load current value, and short circuit current for each electrical protection component in the busbar room panel at PT Trias Indra Saputra. The analysis was carried out by comparing the results of manual calculations with calculations using the XL3-Pro calcul software, as well as the installed protection components. After calculating and comparing the results, the electrical protection components are still suitable for use as protection in the event of a fault, both short circuit fault and overcurrent on the electrical equipment in the busbar room panel at PT Trias Indra Saputra. In the outgoing protection Q0 is a protection component that connects the power source from the LVMDP panel to the busbar room panel at PT Trias Indra Saputra. Different results were obtained from the three comparisons. By using the MCCB current rating of 100A, it has been able to secure the circuit from short circuit faults and overload
pH merupakan pengukuran konsentrasi ion hydrogen dalam larutan yang menyatakan derajat keasaman dari larutan tersebut. Larutan dengan pH rendah disebut asam, sedangkan larutan dengan pH tinggi disebut basa. Skalanya adalah ‘0’ (asam kuat) sampai ‘14’ (basa kuat) dengan nilai 7 yang mempresentasikan air murni (netral). Tujuan dari perancangan alat pengukur kadar keasaman minuman kemasan dan kematangan buah adalah agar dapat membantu mempermudah seseorang yang ingin mengetahui kadar keasaman suatu cairan dan menganalisis tingkat kematangan buah jeruk berdasarkan nilai pH-nya. pH untuk tingkat kematangan buah, digolongkan dalam tiga kondisi yaitu mentah, sedang, dan matang. Data yang diperoleh dari pengujian alat pengukur kadar keasaman minuman kemasan yaitu pengujian terhadap sampel minuman kemasan error terbesar terdapat pada minuman cola yaitu sebesar 0.88 % sedangkan error terkecil terdapat pada minuman Jus lemon dan Minuman Berenergi yaitu sebesar 0 %, sedangkan hasil pengujian alat terhadap tingkat kematangan buah, didapatkan data yaitu dari sampel yang diuji sebanyak 4.40 % sampel dalam keadaan mentah atau dalam hal ini terdapat 4 buah jeruk dalam keadaan mentah, 3.30 % sampel yang duiji dalam keadaan sedang atau sebanyak 3 buah dan sisanya 3.30 % lainnya dalam keadaan matang atau sebanyak 3 buah.
Penelitian ini bertujuan untuk mengembangkan media pembelajaran C-Math berbasis macromedia flash pada pokok bahasan lingkaran serta untuk mengetahui tingkat kevalidan, kepraktisan, dan keefektifan dari media pembelajaran matematika yang dikembangkan. Penelitian ini merupakan jenis penelitian dan pengembangan atau research & development (R&D) dengan model pengembangan 4-D (Four D Models). Adapun tahapannya meliputi: 1) pendefinisian (define), 2) perancangan (design), 3) pengembangan (development), 4) diseminasi (disseminate). Subjek uji coba dalam penelitian ini adalah siswa kelas VIII MTsN Gowa yang berjumlah 30 orang. Instrumen yang digunakan untuk mengumpulkan data adalah lembar validasi oleh validator, tes hasil belajar dan angket respon siswa. Hasil penelitian menunjukkan bahwa berdasarkan analisis kevalidan diperoleh nilai koefisien korelasi sebesar 0,96 yang berada pada kategori “sangat baik”. Berdasarkan analisis kepraktisan diperoleh persentase angket sebesar 90,01% yang berada pada kategori “sangat layak”. Kemudian hasil analisis kepraktisan diperoleh persentase ketuntasan hasil belajar sebesar 85%. Dengan demikian, dapat disimpulkan bahwa media pembelajaran C-Math berbasis macromedia flash pada pokok bahasan lingkaran dapat dikatakan layak menjadi salah satu media pembelajaran pada proses pembelajaran matematika.
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