For example, here, the left most battery increases the voltage from 0v to 12v, then the middle battery increases the 12v to 24v and the right most increases the 24v to 36v. How does the middle battery actually increase the voltage coming in from the from the left of it by 12?
I've looked up how batteries work online, all the animations and videos show how current flows from the negative terminal of the battery to the positive terminal of the same battery.
Okay, but how does this arrangement work when two batteries are next to each other? And why does this increase voltage, but not current? Surely if I add another battery to a circuit, and the voltage increases (I don't know how it increases), and the resistance remains the same, then current has to increase!
And while were here, could you also explain why in parallel, the current increases?
(unfortunately I cannot post a 3rd link, which would have been of a parallel circuit, but google imaging 'batteries in parallel' should show an image like the first one in my post)
Does it have something to do with kirchhoff's current law? The current entering and leaving a node must be 0?