1. The problem statement, all variables and given/known data https://6002x.mitx.mit.edu/static/circuits/ocwe1_1.png [Broken] What happens when you click on this link? https://6002x.mitx.mit.edu/section/three-series-resistors-slow/ Exercise 1-1, Part 1, Detail Or this one https://6002x.mitx.mit.edu/courseware/ The original problem is under Week 1 Tutorials These are all publicly available videos and materials ^ I was able to view the above with just any computer 2. Relevant equations V=IR P= I squared times V 3. The attempt at a solution It's not my solution it is just the video walkthrough of the problem I have trouble with. The right hand side of the screenshot with handwriting is done before the power calculationso n the left. In the video of the above, the speaker just labels the + and - ends of the resistors after having already computed V of R1, V of R2 etc. So he labeled them after doing the entire right side. He then says that this notation causes the negative sign in the Power equation. I don't understand that. 1. But first, I don't understand how the + and - markings on the resistors would affect any of the calculations on the right side. Once I understand that I think I will understand the negative sign on the power calculations better. 2. For the expression for I (the current) in the top right that is boxed in, does the markings of + or - on the resistors affect that expression? 3. What happens when you click on the links?