AP Physics C - Electrical Potential
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- เผยแพร่เมื่อ 30 ก.ค. 2024
- A brief introduction to electrical potential energy and electrical potential (voltage) for students in calculus-based physics courses such as AP Physics C: Electricity and Magnetism. For more information, please visit APlusPhysics.com
Dan Fullerton, you are my hero.
Awwww, thanks!
Here in 2020 and I can't help but say how amazing these videos are. You explain everything exceptionally well step-by-step. You don't just throw formulae at the students! Years later, these videos are still the best physics C explanations on youtube. Many thanks!
Glad you're liking them!
Your videos are outstanding. I love how you don't over complicate these topics, as my textbook often does.
Your videos are about to save my life in a big test tomorrow in AP Physics. Thank you so much!
Indeed Mr Torres
Indeed Mr Torres
many years later and these are still helping me so much!! thanks, you make my day everyday
Makes my week to hear this. Thank you!
Thanks for sharing, and for the kind words!
great lesson as usual, the derivations rock, thank you.
I shared your video with my friends and they did not take last three classes. In their words," your video outshines the class in school. Good job, really appreciate your effort and like your teaching style.
I am so glad I found this playlist. An excellent explanation!!! Thank you very much :D
My pleasure! Please feel free to share with colleagues/classmates/teachers. Would love to hear how your course is going!
PLEASE Make a AP Physics E& M book. Your book has been such a great guide for teaching AP Physics C. Life saver
Good Morning Kelly! Sounds like a great idea... (it's in the works -- I was actually up at 4 am this morning working on it before school). Thanks for the kind words. If you're a fan of the APC Mechanics book, it would be tremendously appreciated if you would consider writing an honest review of it on Amazon.
The FRQ examples like what you just did in at the end of this video really help put things into perspective :)
Glad to hear it... it's all about practice!
This helped so much. Physics 2 is much more conceptual based than physics 1 where the majority was just knowing the formulas!
Such a great video!
Thank you these help help out alot!
Keep making these, please. My professor only seems interested in deriving the formulas with multivariate calculus (which we haven't gotten to yet). The next chapter is: Capacitance! You should totally make some videos on that in lieu of (or perhaps rather in addition to) the professor's lectures! :D
Glad to hear it's helping out!
Love ya m8
Simple and clear
On sample problem 1 around @13 minutes, why did you set the units of the charges to microcoulombs? Does that follow the standard unit of a voltage?
Thank you Mr. Fullerton for these videos
You're welcome!
you are amazing sir
Are the slides available?
Very useful! For the speed of electron question, is it better to use F=ma to solve (V^2=2ax)?
Physics Video You'll find there are multiple paths to solving most of these problems -- pick the one you're most comfortable and efficient with.
I find your videos extremely useful! But I wish you could work us through some actual MC/FRQ problems!
Great idea. It's on the "to-do" list!
Check out all the practice exam videos... :-)
Thanks for the video, but i don't understand the relationship (+/- sign) between W and U. Does U and W have a direct proportion or not? At 3:01, you said W=U, but at 3:59, you said F=-dU/dr. but F=dW/dr, so which means U=-W. It is controversial, or maybe I understand it wrong. Can you explain that? thank you.
F=-dU/dr is the purest sense of the relationship. At 3:01, note that I'm talking about the work done to move a charge into that configuration. If I do that much work to get it into that configuration, that is then the potential energy of the charge once it's in place. Instead of focusing on the +/- sign, try and think about what is doing the work (and giving up energy) to turn it into energy of position or state of being (potential energy). F=-dU/dr is correct. Any other versions you see or hear only look different because of definitions of what is doing the work or work is being done on it. Complicated, I know. Which is why, instead of focusing on +/-, try and think about what is giving up specific forms of energy and what is gaining specific forms of energy. Your head will hurt a lot less. :-)
Okay, that make much more sense. Thank you really much!
My school doesn't offer E&M, but I'm taking mechanics next year and I'm thinking of self studying E&M for next May. I've always enjoyed physics, though I've never taken any physics classes before, and I understand concepts really well. I also did calc AB (doing BC next year) this past year and I'm pretty sure I got a 5. I've been watching your videos, but, no offense, they obviously aren't enough to give me full understanding of the topics in E&M. They're more like introductory/review videos I think. What is the best place to go to self study, and I'm looking for pretty comprehensive knowledge and a 5 on the exam :)
Keller Martin Hi Keller -- the tricky part about physics is it's something you do, not just something you know, so any self-study program should include a significant amount of hands-on discovery and lab work.
+Keller Martin My school offered me the AP Physics C E&M class, but there are only 3 people in the class and it's mixed in with the mechanics class. The teacher only teaches the mechanics class and he gives the three of us separate quizzes and tests. I would definitely recommend using the AP physics C book if your school has one. The electricity and magnetism starts at chapter 23 in our book. I use the book to get most of my information, but I also use youtube for brief summaries like this. I would also recommend trying to get an AP Physics C teacher to independent study with if your school offers that because there are a few things I would want a teacher to explain to me (Such as partial derivatives and some integration that we learn at the end of Calculus BC). Other than using a book you could look up reviews for each chapter as you go along.
At 8:56 why did you make the q negative?
I got ahead of myself in the derivation. The negative shouldn't show up until the next step (nerves of trying to keep all this in my head as I was shooting). The negative comes from the derivative of r^-1.
Good vid. Throughout the video, W is equated to U. However, in my book and notes I always have seen U = -W not = W
This is a confusing fact. Whats right?
Example: My book says V = -W/q not W/q
Probably not the answer you're going to like, but they both are. It depends on if you're talking about the system doing work, or work being done on the system. Instead of focusing on the negative sign, I recommend thinking about what's happening and in what direction the potential energy is changing. Use that deeper understanding to guide your use of the formula instead of focusing on the +/- sign. Good luck!
I am a little bit confused here: Electric Potential and Potential Energy are two different things?
Yes, they are different. Electric potential (voltage) is the electric potential energy per unit charge. Kind of like the difference between height and gravitational potential energy.
thx
Love from india, nice explanation but didn't understood anything 😅😅
lol~thx alot
very clear simple and lucid video! can explain why in th-cam.com/video/PytK413SRjY/w-d-xo.html 'dr' is used rather than '-dr'. thanks