Hi,

I homeschooled my grandson last year. This year he's in public school. (Third grade). We sure do miss it. It tugs on my heartstrings.

But not to digress. We started to work on this years science project ,today. We covered the scientific method, vocabulary and did a bunch of really cool stuff on "Brain Pop, Jr..  He has his heart set on doing an experiement with a potato making a light go on. The electrolytes in the potato juice will be the substitute for the sulfuric acid that is found in a battery. Pretty neat! My difficulty lies in how to formulate a hypothesis. Since it's not a demonstration, but an experiment, I'm a little bit at a loss, on what kinds of ideas I can suggest to him. I thought of one, using three different kinds of potatoes and picking one as the potato with the most light emitting energy. Do you think that is a good one? I'm hoping one of you all have some more ideas for me. I would like him to pick one for himself out of many, or maybe he might be inspired to formulate one himself after he sees what other ones are out there.

Here is a potato experiment that is the background for our science project. It does have a hypothesis, but I don't want something that's been done many times over.

http://www.miniscience.com/projects/PotatoElectricity/

Thanks so much for reading my post.

check out my bookshelf.  I have 3-4  'Science Fair' project books.

Maybe add an apple, lemon, orange, or cucumber to the experiement.  Does more acidic food produce more current?  How about if it is cooked?  What if you tried a chocolate cupcake?

I found this website that has some good twists to the same experiement.  http://www.kidslovekits.com/projects/FruitElectricity/