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Step 14:

This time the light lit up!  Hurray!   Potatoes can be used as batteries.
<p>I have made many experiments with potatoes, but there was no difference, when I measured the output for boiled potatoes and raw potatoes. </p><p>When you make the experiments with led in different colors, you will find, that you need more power to lightening the green led. </p><p>It is not only the voltage, who counts but also the current, and green led need more current than white. </p>
<p>Thanks for the info and thanks for sharing.</p>
<p>Boiling them definitely makes a difference (or just microwave them). You won't notice it if you just measure the voltage but they are able to output more power. This is because cooking them reduces the internal resistance.</p>
<p><a href="http://www.smithsonianmag.com/innovation/a-potato-battery-can-light-up-a-room-for-over-a-month-180948260/?no-ist" rel="nofollow">http://www.smithsonianmag.com/innovation/a-potato-...</a></p><p>Boiling them apparently increases the output 10x </p>
Cool. Sound like an experiment to me. Thanks for sharing.<br>
<p>I'm doing this for my Science fair! Thanks for the idea!</p>
You can also make batteries out of lemons, might help you mix it up a little&nbsp; .Which would be better, lemons as batteries or potatoes?&nbsp; Good luck on your science fair project.
<p>How many of each do we need???</p>
Depends on how much electricity you want to create. You will need two pennies and two nails for each potato section. Since I have no idea what your are after I really don't know how many of each think you will need. Read the Instructable and do the math, and yes I did some algebra to get the answers I needed to write this Instructable. Good Luck!
<p>I just read that if you boil your potato you lower the internal resistance and can improve the output by 10x. </p><p><a href="http://www.smithsonianmag.com/innovation/a-potato-battery-can-light-up-a-room-for-over-a-month-180948260/" rel="nofollow">http://www.smithsonianmag.com/innovation/a-potato-...</a></p>
<p>Sounds like an experiment to me. Try it and let the world know the results by writing an Instructable about it.</p>
<p>trying to do this in my science Investigatory Project may I ask if how many is the required voltage for the bulb your using because i tried it with a 12 volt bulb and it took me like 10 potatoes and still no light </p>
<p>One potato battery will make about 0.85 volts. Do the Math to determine how many batteries you will need to light a 12 volt light. Maybe you will need to switch to a lower voltage LED light. Mine only needed 6 batteries to get mine to light. Hope this helps and thanks for asking.</p>
<p>Good info. I sure am going to try it. Probably have my kid take it to school as a project.</p><p>Thanks mate..</p>
<p>Welcome. I used it as a project in a class with teenagers. I thought it was fun! Thanks for commenting.</p>
If the battery works on the electrolyte Potassium, is it possible to make this work with salt water? Would NaCl be electrolytic enough?
yes you can <br>
Yes it can. Look at this Instructable to learn more: <a href="http://www.instructables.com/id/Salt-Water-Powered-Paper-Lights/" rel="nofollow">http://www.instructables.com/id/Salt-Water-Powered-Paper-Lights/.</a>&nbsp; Thanks for commenting.
science comes from the life.
Are your potatos rechargeable:)
Woman, you never cease to amaze me!
I keep coming back to this comment, it really tickles my fancy. :)
When I first learned that the Challenge was potatoes, I knew that I will have to do something wild and wonderful, which meant, not my &quot;potato soup or salad&quot; recipes. Glad you like it.

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