I am doing a project for my school's science fair. My project is on fruit and vegetable battery. The question I am trying to answer is, "What fruits or vegetables will power an LED light the longest".
I went to a hardware store and they did not have any LED lights that could be powered by 2 volts. Instead, they gave me a 1 cell AAA light which should be powered by 1.5 volts. I am producing more than 1.5 volts, though.
I have tested lemons, potatoes, limes, and tomatoes, none of them have powered the bulb at all. The thing is, I have tested the bulb and it does work. The batteries are producing ample amount of voltage. One lemon battery produces about 1 volt while a lemon battery connected in a series produces almost 2 volts. I have also measured the amount of voltage an AA battery is producing and it produces the same amount as one lemon battery. I have been using alligator leads and a multimeter. I know I have connected it correctly as well. I have also watched videos and followed those.
I have tried testing it and trying many different ways. Like changing the connections, the copper wire, and the light bulb, nothing is lighting the bulb up.
I do not seem to know what the problem is. I have consulted some people at the hardware store also but they did not have an answer. They do not know why it is not lighting the bulb up.
Do you have any suggestions on what to do? Why is the Alkaline AA battery powering it but the fruit/vegetable battery not powering it? Do I need more batteries connected in series? Is there not enough current being created, if so how do I produce more current?
My rough draft for the final report is due 10/18/12.
Thanks for your help,