Presentation on theme: "Can We ‘Grow’ Electricity?!"— Presentation transcript:
1Can We ‘Grow’ Electricity?! Group #1 ★Can We ‘Grow’ Electricity?!Zhi Wei Ngion, Tiffany Park, Leo Siha, Amy Wan, Sherry Zhang
2★ Introduction Generating power produces PollutionGlobal warmingLemon and potato as power sources:CleanRenewableBiodegradable
3★ Physics Experiment Voltage output of lemon & potato batteries How time affects the battery’s effectiveness
4★ Physics Data Presentation Experiment I day 1 day 2 lemon voltage ± 0.001VVoltage ± 0.001V10.9850.99320.9900.95130.9730.98941.0000.96351.0080.950Average0.9910.969
5★ Physics Data Presentation Potato Voltage ± 0.001V #1 0.808 0.743 #2 0.8950.814#30.9280.794#40.9380.940#50.9920.857Average0.9120.830
6Physics★ConclusionLemon batteries’ potential difference (voltage output) are relatively largerAverage potential difference (voltage output) of the batteries decrease as time increases
7★ Chemistry Oxidation-reduction (redox) How do lemon batteries create electricity?Oxidation-reduction (redox)These reactions involve the transfer of electrons between substances.Redox reactions release energy, and this energy can be used to do work if the reactions take place in a voltaic cell.
8★ Chemistry Standard Electrode Potentials The cell potential is a measure of the difference between the two electrode potentials.The standard electrode potentials, Eo , in aqueous solutions of Cu and Al are and –1.66 V with reference to hydrogen H.The cell voltage of the ”lemon battery” is the “difference”,U = (+0.34) – (-1.66) = 2 V.
9★ Chemistry Experiment To investigate the relationship between the acidity of the lemon and its voltage output.
10★ Chemistry Data Presentation Experiment II China Voltage ± 0.001 V pH ± 0.1Thailand10.9613.00.9482.820.9912.90.97630.5050.51740.94750.9643.30.9556Average0.86970.9693.180.9403.290.957100.916
19★ Biology Conclusion Both sets of data are randomly scattered Mass does not effect the voltage output of the lemons
20Conclusion and Evaluation ★PhysicsStatistic values20W light bulb2.5 mg of coal (1 second)2.5 kg of coal (11.5 days) cost: 2.5 RMB108 lemons can provide the amount of voltage to power 27 LEDThe light energy given out by 27 LEDs equals to 120W light bulb234 lemons can provide the amount of voltage to power 120W light bulb108 lemons (from mainland China) cost 216 RMB
21Conclusion and Evaluation ★PhysicsEffectiveness of lemon batteriesIndividually and in groupsTime factor:Lemons biodegradeLemon batteryVoltage ± 0.1VSeries of batteries10.92.1230.7Total voltage2.5
22Conclusion and Evaluation ★ChemistryEffects of electrodes on the lemon battery- Surface oxidation- Electrochemistry potentialSubstanceStandard electrode potentialLithium﹣3.04Magnesium﹣2.37Aluminum﹣1.66Zinc﹣0.76Iron﹣0.44Copper＋0.34Silver＋0.80
23Conclusion and Evaluation ★ChemistryEconomic costs for the electrodesEffects of acid in lemon on the electrodes- Corrosion of metalRequirements for the redox reactionMust be electrically connectedCould be provided by just the lemon juiceMetalsCost (RMB per ton)Magnesium15.4 thousandAluminum15.3 thousandCopper (electrolyze)59.0 thousandZinc16.4 thousand
24Conclusion and Evaluation ★BiologyLemons can be genetically altered to become smaller in size therefore more space efficientlemons are only able to bear fruit year round when grown in mild climateTransportation of lemonsAreas to mass produce lemons 1. Building Greenhouses 2. Opening more areas for plantation 3. Not enough spaceEffect of mass production of lemons on other plantationUse of water
25Conclusion and Evaluation ★BiologyNot enough lemons affected accuracy of data1. Variety of sizes2. Variety of locationsTime1. Grow lemons under different conditions (e.g. soil pH)