<p><em>The purpose of this study was to determine the effect of solar panel circuits on current, voltage and power. This research is a true experiment. Dependent variables were current, voltage, and power. Independent variables were a series circuit of solar panels and a parallel circuit of solar panels. The sample numbers of studies were 12 for each group of independent variables. The data were analyzed using the t-test at the 5% signification level. The results showed that the electrical power produced by a series circuit of solar panels was, P = 4.81 watt, Sd = 0.24. The electrical power produced by a parallel circuit of solar panels was P = 4.69 watts, Sd = 0.13. The t-test showed that there was no difference in electrical power produced by the series circuit of solar panels and parallel circuit of solar panels, with t<sub>o</sub> = 1.525 < t<sub>α/2, v</sub> =2,074. The form of a circuit (series or parallel) has no significant effect on power but differs only in current and voltage. In series circuit, I<sub>1</sub> = I<sub>2</sub> = I<sub>Σ</sub> and V<sub>1</sub> +V<sub>2</sub> = V<sub>Σ</sub>. In parallel circuits V<sub>1</sub> = V<sub>2</sub> = V<sub>Σ</sub> and I<sub>1</sub> + I<sub>2</sub> = I<sub>Σ</sub>. This can be adjusted to our purpose of using solar panels circuit. If it requires a large current, the solar panels must assemble in a parallel circuit. But if it requires a large voltage, the solar panels must assemble in a series circuit.</em></p><p><strong><em>Keywords</em></strong><strong><em>:</em></strong><strong><em> </em></strong><strong><em>current, parallel, power, series, voltage</em></strong></p>
This study aims to describe the working system and test the performance of the machine, to find out an overview of reducing the moisture content of betel nut dried with a rotary type betel nut dryer machine with a heat source from a used oil-fueled stove fire. The methods used in the study consist of the design stage and the performance test stage. The design stage was to carry out the construction design process, material selection, and fabrication process. While the performance test stage aims to determine the ability of the machine to carry out the betel nut drying process. The results of the design of the rotary type betel nut dryer machine consist of a heating system and a drive system. The heating system uses heat from the used oil-fueled stove and the drive system uses an electric motor connected to the reducer gearbox to rotate the cylinder of the drying chamber. The maximum air temperature generated during the 7-hour performance test process was 108oC with an air flow speed of 3,8 m/s. The results of the design of the drying machine are able to reduce fruit mass by 5.5 kg with a drying rate of 0.785 kg / hour on wet betel nut. The reduction in the moisture content of dried betel nut is directly proportional to the reduction in mass. During the 7-hour drying process, the moisture content of the betel nut is reduced by 55% with a reduction rate of 7.85% / hour
Untuk memberikan perlindungan tenaga kerja dari kecelakaan dan penyakit akibat kerja, maka perusahaan haruslah terlebih dahulu memahami resiko dan potensi bahaya yang ada pada pekerjaan yang mereka jalankan. Potensi bahaya merupakan suatu potensi untuk terjadinya insiden yang berakibat kerugian sedangkan risiko adalah kombinasi dan konsekuensi suatu kejadian berbahaya dan peluang terjadinya kejadian tersebut (ILO). Menurut Direktur Pelayanan BPJS Ketenagakerjaan Krishna Syarif dalam finance.detik.com "Sepanjang 2017, menurut statistik kami terjadi peningkatan kecelakaan kerja sekira 20 persen dibandingkan 2016 secara nasional". Total kecelakaan kerja pada 2017 sebanyak 123 ribu kasus dengan nilai klaim Rp 971 miliar lebih. Angka ini meningkat dari tahun 2016 dengan nilai klaim hanya Rp 792 miliar lebih. Sedangkan menurut Kepala Badan Penyelenggara Jaminan Sosial (BPJS) Ketenagakerjaan Kantor Cabang Pontianak Ady Hendratta dalam Tribun Pontianak menerangkan “Angka kecelakaan kerja sepanjang Januari 2018 sebanyak 99 kasus di Kalimantan Barat. Ada 99 kasus kecelakaan kerja yang didominasi oleh perkebunan sawit. Persentasenya 40 persen". Dari data kecelakaan kerja tersebut, maka dapat dihitung bahwa 40% dari 99 kasus yang terjadi sebanyak 40 kasus kecelakaan kerja terjadi di perusahaan perkebunan sawit di Kalimantan Barat dalam tempo 1 bulan. Berdasarkan hal tersebut di atas maka penulis tertarik untuk membahas tentang Analisa Resiko Keselamatan dan Kecelakaan Kerja di PT. X yang merupakan perusahaan yang bergerak di bidang Perkebunan dan Pengolahan Sawit. Dari hasil analisa disimpulkan bahwa resiko keselamatan dan kesehatan kerja yang paling dominan adalah pekerjaan yang berhubungan dengan bahan kimia seperti pupuk, pestisida / herbisida, insektisida. Pekerjaan yang berhubungan dengan bahan kimia, jika syarat alat pelindung diri dipenuhi dan ditaati kemungkinan untuk terjadi kecelakaan memang kecil, tetapi hal ini berpotensi menimbulkan penyakit akibat kerja, karena efek dari bahan kimia tersebut adalah efek jangka panjang.
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