Congratulations. It is good that your Science Teacher allows you to play like this. Fortunately my Chemstry and Physics teachers would allow side-line experiments to go on at the end of the lessons with left over stuff or other things found in the cupboards. I learnt nearly as much in Chemistry doing this as we had to work out what may happen before we mixed the two things together! What year are you in? From what I remember GCSE Science could seem a bit dull at times, but A-Level stuff got interesting!
Try powering an LED. It may not light, but at least you will have tried! You can light them with a lemon, copper, and zinc, which I don't remember giving much oomph!
Keep up the experimenting. Unfortunately mine has lapsed
.
Sam