loading
So, if you looked at my profile you would see that I like physics.  When the challenge for “Potatoes” I just knew that I need to do a project that highlighted the lowly “Potato Battery”.  So here is how to make a Potato Battery and have it light an LED light.

Step 1:

Supplies:
Potatoes
Galvanized nails
Shinny copper pennies
Wires with alligator clips on each end (2+ per battery)
LED bulb
Multi meter
Knife
Cutting board
<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.

About This Instructable

135,737 views

48 favorites

License:

Bio: In a valiant attempt to keep myself from dying of boredom, I create.
More by craftknowitall: Sweet Bacon Wrapped Smokies Bacon (and/or Jalapeno) Cheese Crisps German Chocolate Pie
Add instructable to: