Development of shake rechargeable flashlight

Thesis (Bachelor of Science in Electrical Engineering) -- University of Rizal System-Morong.

EXECUTIVE SUMMARY: The study aimed to develop a rechargeable flashlight that can be charged simply by shaking in case of no external electricity supply. The research utilized the developmental and experimental research design to evaluate and interpret the results of the comparison between the shake rechargeable flashlight and the commercial rechargeable flashlights that use external electricity source. The researchers were able to develop a shake-rechargeable flashlight, an alternative flashlight device which draws its power from electromechanical power generation. It was found out that the device could be fully charge in 43.8 hours. Also, the developed device could discharge in almost 6.5 hours. The voltage produced by the generator is 12V, enough to charge the capacitor rating of 6.3V and from the capacitor it is supplies the battery rating of 2.4V. the current output measured was 8.225x10-6 Ampere and the power output was 1.974x10-5 Watts. Based on the findings of the study, the researchers concluded that it is possible to produce a rechargeable flashlight which is not relying in AC supply; instead a mechanical work has been undertaken. The developed device provided discharge time, voltage output, current output and power output suited to charge the battery to produce a light. The shake-rechargeable flashlight had longer time in charging compared to the commercial rechargeable flashlight. Based on the findings and conclusion derived, the paper recommends that the future researchers may conduct a similar study which would give focus on the charging time. The said future study may be able to determine the factors to be conceived in order to minimize the charging time of the device; future researchers may consider more parameters such as weight and size, type and diameter of the coil to be used must take consideration, to improve the performance of the shake-rechargeable flashlight in terms of charging and discharging time. Acceptability of the device in terms of its appearance should also be taken in consideration; future research may conduct a parallel to further develop the existing features of the device; future researchers may determine materials other than neodymium magnet and magnetic wires in the production of linear induction to gain a better performance; and the College of Engineering may continue to promote innovations of similar kind and encourage more developmental studies, industry-based inventions, among others which may also serve as input to curricular reforms and improvement of instruction in the College.