This is the third time I've come back to this video. I just want to heavily thank you for the easily accessible and comprehensible revision videos you make because they help sooo much more than any other videos on this platform. I'm in my second year and I struggle revising topics by myself due to the extent of information required to be learnt, but your topic videos make it seem short and simple, encouraging me to watch them and write notes. Your videos alone, including you overviewing topic specified exam questions, have gotten me high grades in multiple exams and I hope to achieve an A in my upcoming final A level exams. Once again, thanks a lot!!!!!
Wow!! Amazing, well done on the grades and your understandign of the subject! Honestly, comments such as these genuienly make my day! Good luck revising and drop me a comment if something doesn't make sense!
Stupendous video!!!!!!!!!!!!! to be pragmatic you're fabulous, keep it physics teacher, you're doing an excellent job by helping A level student around the world, we need you in our current generation, I should recommend your channel one day, As an A2 level student your videos are helpful Masha Allah
I missed this entire lesson when I got covid and I tried to learn it myself using the PowerPoints they sent us but this video is the only thing that made sense to me 😭😭
Thanks alot for this video. Im new to A levels and the topics were haunting me. I couldn't understand much of capacitance from the book but after this video everything seemed to click. I also took detailed notes and shared with my classmates. A few of whom asked where I got them from (Our teacher didn't spend too much time covering this chapter, so I don't think anyone had a good grip on it). I recommended your channel to all of them. Once again, thanks alot :).
Hello! Does this video cover every single thing about the chapter? Can I use it as the sole source to prepare the whole chapter? I missed a lot of classes at school.
I cover every point on the OCR Physics A specification, the syllabuses are very similar on different exam boards but you need to find your syllabus and check if there are any differences. As this covers only the theory side of it I recommend lots of past paper questions on the topic around it. Hope this helps!
Hi can you just explain why charge decreases when discharging? I can't seem to get my head around current charge and voltage changes during discharging and charging.
Sure, literally electrons go from the negative terminal in the direction of the positive, creating current. With fewer unbalanced electrons, the electric potential between the plates is lower and hence lower voltage. Hope this helps!
How about uses of capacitors? In the OCR A book, chapter 21.6, there is a topic on uses of capacitors. Im struggling to understand how a rectifier circuit works.
I can do a video about this type of circuit. Often in uses of capacitors you may be asked to state the use of a capacitor and something like a flash in a camera would score the mark. Or the capacitor problem may just be applied to a situation in a circuit. Hope this is helpful!
@@zhelyo_physics Okay! I’d love to a see video on it just so I have a complete grasp of the topic. Your videos are amazing by the way, I think you’re extremely underrated.
Depends on the exam board, the entire course on most exam boards, AQA can have a couple of bits left which I will film soon. Always check with your syllabus.
this may sound dumb,but in the series and parallel section, wasnt that talking about resistors? the same equation ie 1/c= 1/c1 etc... i learned about resistance
It's an excellent question! I actually made a whole video about this: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-qhllAnlOGso.html (by the way, the equations are similar but also reversed)
Thanks! Not specifically, but I have some on parallel plates capacitors if this helps! ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-GGhupxGAUBU.htmlsi=yzxUfTbHiWBXOsZw
I can check the question later but I think that question relates to the voltage across the resistor when charging. So the p.d. across the resistor decreases with time using the exponential equation.
when multiple capacitors are being charged? Does the voltage of each one of the capacitors add up to V naught in series and would they all share the same charge?
Thanks a lot for the comment! It's a mathematical constant, e, equal to around 2.718 etc, if you look at your scientific calculator you will find a "e^..." button that allows you to raise e to a specific power. Hope this helps!
You mean when discharging? Depends on the circuit, however the p.d. decreases, the current decreases from an initial high value, across a resistor, p.d. will typically increase, due to Kirchoff's 1st Law. When charging - p.d. across the resistor decreases, p.d. across the capacitor increases.
@@zhelyo_physics Thank you so much for your replies: I will never forget how much you've helped me get through this stressful time. I understand that voltage, current and charge across the capacitor decrease exponentially when discharging but what happens to V,I,Q of the resistor in series?
this is the exponential constant, the base of the natural log. You don't need the value to solve the problem with most calculators you will see a button e that will automatically help you calculate. If you do need the value it's around 2.718
not a dedicated one, I do have one on parallel plate capacitors mentioned here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7QKA3h04nNM.html Which exam board are you doing? I can have a look at making one.
Hi, in OCR this is done in Electric Fields as it's way easier to understand after you have done the electric field between two parallel plates. Covered here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-7QKA3h04nNM.html Hope this helps! With regards to storing energy and not charge, which exam board do you do? I'd love to look at the syllabus. The net charge remains the same as the charge is always balanced by electrons leaving and entering the capacitor and stored within the electric fields of it. I should do a video about this, really interesting question.
@@zhelyo_physics I do CIE board. I’m actually not from UK. I’m from Nepal. I am doing A levels from Nepal. Here there is no difference between the boards. All a level students in Nepal I guess study under the same board.
