A thermoelectric generator (TEG) converts thermal energy directly into electrical energy. The principle work of this device is known as a Seebeck Effect. The TEG can be used effectively to harvest low thermal energy to power a low power Wireless Sensor Node (WSN). As the same as solar cells, the TEG connection can be a distributed string either in parallel or in series. However, the performance of the TEG string due to the inhomogeneity temperature gradient in each TEG is still not well investigated. This paper presents the effect of the inhomogeneity temperature gradient on the performance characteristics of the TEG string. The test is carried out using a Thermoelectric Cooler (TEC) as a thermal source on the TEG string. The experimental result is provided to verify the performance of the TEG in various cases of this inhomogeneity temperature gradient.
In the world of education, a process of experience is obtained as a result of learning. To improve the quality and creativity in their learning, serious efforts are needed in creating tools as learning media. By making a signal generator PQRST tool from the research this time, students are able to know the PQRST signal form. The results of this study are the tools successfully created by producing signals with the form of PQSRT signals. From the results of the filter testing, HPF with cutoff frequency of 250 Hz will change the shape of the PQRST signal. This is caused by HPF 400 Hz cutoff frequency value is greater than the PQRST 296 Hz signal frequency. This also applies to LPF, LPF 500 Hz cutoff frequency value is smaller than the PQRST 593 Hz signal frequency so that the PQRST signal will be further away from the original form. in testing the BPF, the PQRST frequency of 296 Hz will not change due to the range of cutoff frequency values is 100 Hz to 500 Hz. After that, this study got results of student responses with an average of 4.2 out of 5.
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