Hi Amalina,
Excellent question!
The sciencebuddies article (
http://www.sciencebuddies.org/science-f ... p029.shtml) mentions potatoes, citrus fruits and onions. It encourages experimentation with other fruits and vegetables.
Elsewhere, lots of fruits and vegetables are discussed, but none yet for pineapple. I encourage you to run a pineapple experiment, and let us all know if a pineapple battery works.
Here are some additional resources:
orange
http://www.youtube.com/watch?v=Bls18uqraoUpotato
http://www.youtube.com/watch?v=m64ogRLvDsIlemon
http://pbskids.org/zoom/activities/sci/ ... ttery.htmlapple, lemons, tomatoes, onion,, potatoes
http://wiki.answers.com/Q/What_fruit_or ... ve_batterylemons, oranges, potatoes, carrots
http://www.finishing.com/262/03.shtmlwhat other fruits can make a ’lemon battery’?
http://van.physics.illinois.edu/qa/listing.php?id=2404discusses why and how electricity is generated by fruits and vegetables
“As for what foods can be used, almost any fruit or vegetable should work,” discusses some, but doesn’t discuss pineapple.
pineapple
http://wiki.answers.com/Q/Can_a_pineapp ... ve_batterycontain "This question has not been answered yet."
So, when you run a pineapple experiment, you could answer the question!