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Author: admin, 01.02.2015. Category: Organic Food

Check out the video on how you can do it and for more information about the Lemon Powered LED experiment visit Steve Spangler. In this science fair project,construct batteriesfrom various fruits and testthem to see which one will producethe most electric current.
When two dissimilar metals are placed in a common conducting solution,electricity will be produced.
A wet cell consists of a negative electrode,a positive electrode and an electrolyte, which conducts ions (atoms with an electric charge). In this project an LED is used to indicate if the fruit-cell is generating an electric current.A Light Emitting Diode (LED) is a semiconductor device which converts electricity into light. Did putting the electrodes farther apart make the current increase or decrease, or stay the same? Connect the longer of the two LED leads to the copper strip and the shorter lead to the metal strip using a pair of alligator clips.
For a more scientifically-accurate investigation, the entire processshould be repeated twice more.
Calculate the average current produced by adding the values from the three independent results and dividing the sum by three for each fruit. Using the data in the table, plot a bar graph withname of fruitalong the x-axis andcurrent along the y-axis.

Mike Calhoun is a consultant for the National Science Teachers Association, a veteran science teacher, and hosts an online science website.
They come in different shapes and sizes that convert chemical energy into electrical energy.
In this science fair project, copper and zinc metals will be used as the electrodes and the citric acid found in fresh fruit is the electrolyte. An electric current can flow only in one direction through LEDs, which means that they have a positive and negative terminal (also referred to as the anode and cathode). Also if a small motor is used instead of an LED and it doesn't automatically start when attached to the fruit cell, twist the armature. Over the years Mike has studied trends in science, education, and finance, conducting research, developing programs, and writing articles on these topics. If you no longer have access to the e-mail address associated with your account, contact Customer Service for help restoring access to your account.
But did you know that you can use chemical energy stored within a lemon to power a small LED light.
In the early nineteenth-century, Alessandro Volta used this fact of physics to invent the voltaic pile and discovered the first practical method of generating electricity. The chemistry behind the fruit cell is that zinc is more reactive than copper which means zinc loses electrons more easily than copper.

The cathode should be connected to the negative zinc metal strip, and the anode to the positive copper strip.
This is the reason why even though the nails were not touching each other, your fruit battery still worked! As a result, oxidation occurs inthe zinc metal strip and zinc metal loses electrons which thenbecome zinc ions.
When you inserted the galvanised or zinc nail into the fruit, negatively charged ions or electrons started tomove from the fruit to the zinc nail thus leaving the protons in the fruit. The electrons then flow from the zinc strip to the copper strip through an external circuit.
This transfer of electrons generates electricity and as soon as you attach the wires to the nails, the bulb lights up!

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