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Letter 11566
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Not exactly, Evan. Let's compare to a battery: Flashlight batteries that you buy at a store have a zinc case, with a carbon rod in the center, and they are filled with a conductive black glop. The electricity in a battery is a result of the difference in the electrochemical potential between the zinc and the carbon, combined with the fact that the conductive black glop allows ions to travel from one electrode to the other. |
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Hello we are crying and we want to know why do we get less voltage from a lemon than from an apple..by using an analog multimeter, maybe we are doing something wrong can you help us, we are from 8th grade and we can't find an explanation why we get so little voltage from the lemon compared to other fruits, why did we get more from the apple, is the apple acidic? Rebecca B |
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++++++ You are probably not using identical electrodes in the lemon, Rebecca. The voltage depends mostly on the two different metals that the electrodes are made of. It does not depend very much on the electrolyte (the apple juice, lemon juice, real tears, or crocodile tears). Try again using the same electrodes in the lemon as in the apple. It may not be there forever, but here is a great YouTube video on lemon batteries
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I found that all citrus fruits will power a small light bulb. Also
if you cut two slits in to your fruit, stick a nail in one and a
copper penny in the other slit, they will act as the plus and minus
sides of a battery. The nail will be coated in zinc, and the penny
will be made of copper. This will only work if the two metals are not
touching. (Sometimes pennies aren't made with pure copper, so for
best results, use a real copper wire). The nail and penny are
scientifically entitled electrodes. The fruit juice is scientifically
identified as an electrolyte. The flow from the minus to the plus
side is the flow of electrons. The penny and nail are the conductors,
which allow electrons to flow through them.
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Electricity is produced by the flow of electrons. The
electron flow is sometimes produced by chemical reactions.
Some of these reactions including this are the zinc from the
nail, the copper from the penny, and the citric acid from
the fruit. Allie A
November 22, 2008 HEY I'M MARIA I TESTED MANY MANY FRUITS. i have a question. What would be the hypothesis for this project??? Maria G
December 8, 2008 Hi, Maria. Your hypothesis should be an educated guess about something, and it should be testable. Ideally it should involve independent variables you can alter and dependent variables that change in a cause & effect way when you alter the dependent variables. So it would be nice if your experiment was more quantitative rather than qualitative. In other words, answering a yes/no question like "is 100 lemon batteries enough to run a computer" is quite impressive, but not quite as satisfactory a science experiment as saying "I believe that the voltage available from lemon batteries is cumulative, additive, and directly proportional to the number of batteries" and then graphing the number of batteries vs. the voltage you generate. If you accept this suggestion, just leave out "I believe that" and you have your testable hypothesis. Regards,
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November 26, 2009 I am doing a Science Fair project off of something i saw on TV. It was a lemon stereo I am using galvanized nails, copper, wire and radio , oh and a plug that looks kind of like what you would use to start up your car when the battery dies but it is a lot smaller and is not connected.I need help! Please respond ASAP! Please I'm in the 7th grade. Thanks for anything you can do. KayLynn C
November 2009 Hi, KayLynn. Unfortunately I did not see the TV show that you did, and I have no idea what you're talking about. Sorry! Regards,
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