Hi guys. Really elementary question here, I've been kicking myself for ages trying to figure this out, but I suppose everybody needs a little nudge sometimes. I have been staring at this circuit diagram: From this page: http://www.facstaff.bucknell.edu/mastascu/elessonshtml/Basic/Basic5Kv.html which is basically a rundown of Kirchoff's Voltage Law, and I have been wracking my brain for why voltage V3 is labeled (-) with respect to the power source and (+) with respect to ground. If I follow a current running from the positive terminal of the power source, then it splits up into the two branches to go through R2 or R3 and R4, respectively. The directionality of the voltage (to my intuition) should be the same for V3 as it is for V4. It is dropping voltage, not adding to it. Thanks for any help you can provide!