Razan Hamzeh Abdul-Nabi
Pineer Center for Talented Students, Al korah, JORDAN
This study aimed to determine the ability of generating electricity from cutting pieces of Cactus plate and time period of continuously feeding up LED lamp with constant voltage and current , beside studying the effect of electrodes kind and their size on the produced voltage, and determine the enough minimum number of cactus pieces to make 3&5mm LED lamp start lighting up. By using very cheap electrodes the experiment was carried out because one of the most goals of the project was to develop a cheap battery, an Cu/Mg electrodes and wires were used to connect the cactus pieces in series. The results showed that the cactus electrochemical cells with Cu/Mg electrode generating voltage by 39% more than the cells which use Cu/Fe electrodes, for that the generated voltage form 8 cells with Cu/Fe electrodes was semi close to the generated voltage from 4 cells with Cu/Mg electrodes, beside that the results showed that no effect for both of electrode and cactus pieces sizes on the generated voltage.In addition the minimum number to light up 3mm LED lamp was on piece whereas 2 pieces were enough to light up 5mm LED lamp. The voltage stability data for 40 hours showed a decrement by 11% after 40 hours of starting the experiment. Regarding to the current of 12 cells connected in series it was 225µA in the beginning then decreased in the first five hours after that it started rise up again until reach high value (238 µA).thus by using 6 pieces semi stable and continuously potential difference was generated for more than 4 days.In addition the directly generated potential difference values from the plates of cactus tree were semi equal to values of the isolated pieces which mean the capability of generating electricity from cactus tree directly. The collected data showed the cactus pieces capable to generate electricity for more than 100 hours. So, the experiments proved the high efficiency of using cactus pieces and tree to generate electricity. Otherwise the electrolytic solution inside the cactus plates is responsible for the generated electricity due its content of citric and mallic acid which is produced through photosynthesis process.