I'm studying basic electronics from the sound reinforcement handbook and I think I see an error in the book, so i'm kind of worried i might not learn the material right. I need to to find out about current flow and its direction. So: If I put a 9v battery on my tongue, does the current flow from positive > tongue > negative or does it flow from negative > tongue > positive? The book says it would flow from negative, but I watched a video from a university class on electricity (you tube) that said that electricity flows from the positive. Thats my pickle.