Energi Listrik adalah energi yang dibangkitkan dari generator kemudian disalurkan melalui Transmisi dan Gardu induk, kemudian disalurkan melalui jaringan Distribusi dan sampai ke konsumen rumah tinggal perkantoran, maupun industri. Tegangan yang di distribuskan sampai ke rumah tangga dengan tegangan yang diterima berkisar 220 Volt, dengan instalasi rumah tangga yang terpasangan beberapa peralatan rumah tangga. Instalasi listrik rumah tinggal yang baik terdiri dari sakelar dan stop kontak yang terhubung ke peralatan listrik. Instalasi listrik rumah tangga terdiri dari KWH meter, MCB, Sakelar peralatan rumah tangga (lampu, pompa) dan Stop Kontak.
Technological and economic developments are directly proportional to the industrial sector, especially in countries that are still developing. The food industry is one of them. Chocolate is one of the growing foods industri. The research on Comparison of the Drying Rate of Cocoa Beans Using a Dryer with Electricity and Solar Energy was carried out using an experimental method, namely with electricity coming from solar panels and then with electricity from PLN. The test aims to get a comparison of the effectiveness of electrical energy against solar panels. Cocoa beans that will be tested for drying before must be fermented first. The purpose of this test is to determine the drying time in a cocoa bean dryer with electricity and solar panels. This test uses the drying method using solar panels and uses electricity. Heat transfer in this test is conduction and convection. Test results are carried out in two stages. the first stage using electrical energy with the result of drying using cocoa beans weighing 2000 grams with a 271watt heater with the highest temperature of 43.6 0C can reduce the water content by around 59% from the mass of the 2000 gram sample weight of cocoa to 812 grams. The second stage is using solar panels where the drying process is divided into 2 stages, the first 8 hours with solar power and solar panels then the next stage using the help of batteries in the afternoon until evening. This stage can produce dry cocoa beans weighing 800 grams of dry cocoa beans from 2000 grams of wet cocoa beans. Thus, it can be concluded that the best drying using electric power can produce 812 grams of dry cocoa from 2000 grams of wet cocoa.
Biaya yang digunakan untuk membeli bahan bakar minyak bumi semakin meningkat, hal ini belum termasuk dengan biaya lain yang dikeluarkan. Meningkatnya biaya penggunaan bahan bakar fosil dan persediaannya yang semakin terbatas menyebabkan banyak penelitian sains, teknik, dan teknologi untuk mencari sumber bahan bakar alternatif lainnya. Salah satu alternatif yang telah ditemukan adalah penggunaan bioetanol sebagai bahan bakar alternatif. Bioetanol merupakan bahan bakar yang ramah lingkungan karena terbuat dari bahan bakar nabati serta memiliki angka oktan yang lebih tinggi dibandingkan dengan bahan bakar fosil seperti premium. Salah satu tanaman yang dapat digunakan untuk menghasilkan bioetanol dari proses fermentasi dan destilasi adalah tanaman tebu. Tujuan dari penelitian ini adalah mendapatkan pengganti bahan bakar yang berasal dari bahan bakar alternatif yang dapat membantu mengurangi krisis dari bahan bakar minyak bumi, mengetahui proses pengolahan tebu menjadi bioetanol, dan mengetahui besarnya nilai oktan atau RON (Research Octane Number) pada bioetanol. Pada penelitian ini dilakukan empat kali percobaan dengan menguji komposisi masing-masing komponen pengujian dan nilai oktan yang didapatkan tiap masing-masing pengujian adalah 114, 115, 116, dan 117.
The increasing need for fuel and the increasingly soaring prices have resulted in many automotive manufacturers creating vehicles that consume more fuel efficiently with ideal engine performance. Torque and power are measures that describe the performance output of an internal combustion motor. These two parameters describe two different performance elements, depending on the use of the vehicle. The selection factor for the type of valve mechanism is based on its technological capability in activating engine power, increasing engine efficiency, reducing exhaust emissions, effectiveness and efficiency in reducing fuel consumption. Focusing on reducing fuel consumption, the most important thing is how there is a good system for engine control, on the engine itself, assistive devices and a good overall transmission system, so one of the valve mechanisms that promises to improve fuel efficiency is effective. Also improvements to exhaust emissions are the CVTC (Continuously Variable Timing Control) valve mechanism. The purpose of this study was to determine the effectiveness of the CVTC valve mechanism on engine power. CVTC has the ability to effectively control the intake camshaft to provide the most optimal valve timing for engine conditions, improve torque at all speed levels, and save fuel.
The purpose of this PkM is to provide welding competency skills to SMK Samudera Indonesia Medan students as a provision to enter the job field or for entrepreneurship for SMK and help the productive process of SMKs that lack funding and practicum facilities. The method used to solve the problems that have been formulated, we need a method that must be followed in order to be able to do a good solution, here is the solution method, namely a survey in SMK to get data for PkM as needed, formulate training materials, make a schedule for the implementation of training related to time, arrange instructors who will provide training, make a design evaluation of activities, The implementation of welding training activities was followed by students. The results of the PkM implementation are as follows: Welding skills that can equip vocational students to enter the world of work are being able to operate a welding machine correctly and be able to connect plates using welding. The responses from vocational students with training assistance from the UHKBPNP Mechanical Engineering Study Program are as follows: they are happy because they have received welding skills which they have not done optimally and the teachers hope that next year they can continue with other programs.
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