I'm working on my first project for this year's up-coming sciencefair, but I'm TOTALLY lost! I've been using this old college text book I found at my school's library, but it doesn't help much, so I'd really appreciate the help. For my robot(Technesium) I'm planning on using a 9V battery(and if I should use a higher voltage, please tell me!), but I don't know what type of wire I should use. The book I'm reading says to use No. 12 wire, but I'm still not really sure. Also, I have one more question, how do I determine the current a battery has? Thanks for your help, really!