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
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
P= I squared times V [/B]
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?
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