The picture given to me was this one:
I've been reading through the book but I don't really understand what I'm looking at. I know that V=I*R. I'm confused about the part between 1.5V and 2V--what does it mean that it's positive at both ends?
Adding up all the resistances will give me the emf (I think), and since I'm given B1 I'm supposed to be able to figure it out, but that positive-positive part throws me off.
Also, what happens if there were 2 or 3 in parallel instead of in series? There's a question later on that looks like the picture above but much uglier with billions of resistors in all different directions and it's really intimidating me since I can't even figure out this weeny problem.