Kirchhoff's Current Law (KCL) - How to Solve Complicated Circuits
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- เผยแพร่เมื่อ 30 พ.ค. 2024
- If you know Ohm's Law and parallel and series circuits, you have a good start but now you need to know how to solve complicated circuits. We're going to learn about Kirchhoff's Current Law, frequently known as KCL, and how we can use that law to do nodal analysis on basic or complicated circuits. This knowledge of KCL and nodal analysis will make complicated circuits simple and simple circuits even... simpler? More simple? Easier! In this video, we cover these concepts, try to understand these concepts intuitively, learn the best way to solve complicated circuits, and then do a few circuit problems with solutions to put that theory into practice.
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Table of Contents:
0:18 Conservation of charge - the basis of KCL.
0:37 Visual representation of the conservation of charge
3:15 Introduction of our five steps for solving KCL
4:20 Step 1 - Take your time
5:52 Step 2 - Find your reference ground (if needed)
6:31 Step 3 - Create equations for each element
7:12 Step 4 - Put the equations together for KCL
7:41 Step 5 - Solving the equations
9:58 Example Number 1
13:25 Example Number 2
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as someone who doesn’t have any background in electrical, your explanation and videos thus far in the playlist makes me feel that I’ve understood it all along and that’s really comforting. Thank you so much for your effort in making these videos!
Most clear and in depth videos I've seen in terms of a newbies guide to circuitry in an organized fashion. Thank you
Glad it was helpful!
I AM GOING TO FOLLOW AND WATCH ALL YOUR VIDEO AND GET MORE DETAILS. I FORGOT LITTLE BEAT BUT AFTER I WATCH THIS A LOT CAME BACK TO MY MEMORY.. I ENJOY WATCHING ALL SERIES OF YOUR VIDEO.
Glad we could help!
THANK YOU, I was struggling for a few hours because I didn't know how to tell which way the charges were going. It seems obvious in hindsight but I was stuck for a long time!
Please consider making a video on super nodes, after all it is your way of explaining that makes the difference.
Thanks for the feedback, Muhammad! I put it in the queue. We've been doing some practical videos (I've been very distracted doing the wiring in a house and setting up the new spot to shoot these videos) but I'm hoping in exactly a month we'll be able to jump back in and focus on wrapping up this Circuits 1 series and I'll do it then.
@@CircuitBread What ever you are doing I am following it 😀
from my heart thank you
.
you are the best! very helpful videos!
Thanks! That's great to hear.
What can possibly cause an LED strip to dim after a few days? I have installed a few fixtures in an exterior breezeway they all became very dim almost like it's not working, only if you look very close you can tell that they actually still "working" of course as soon as he changed them with new ones they also worked for a few days and same story.... (They all connected to the same switch, also they have a sensor that turning it on at night, if it have anything to do with it)
And big thanks for the channel! Love it!
Hi there! Thanks for the feedback and that's really strange about the LED strips dimming. My first thought is that they might be getting too much voltage (like you paired a 24VDC power supply with 12VDC strips) which would cause them to be very bright but then burn out and, instead of exploding or completely failing, simply become very dim (check out our failed attempt to burn out an LED in our LEDs and Forward Voltage video where exactly this happens). Are there other factors to consider? It's an outdoor breezeway, right? Are they exposed to damp or wet and are not rated for it? Are you seeing anything odd on the connection points, like discoloring you wouldn't expect on something so new?
I don't think having a common switch or the light sensor would be a cause of issues but it could be. I installed a timer switch for my garage lights because my wife and kids leave the garage lights on 2-3 times a day (it drives me nuts, we're having a passive aggressive war, it seems) but the timer switch caused my LED bulbs out there to completely freak out, flashing and flickering, so I had to take the switch back out. So, while I don't think it would be switch/sensor related, it could be.
at minute @20:08 what algebra did you use? I jst cant seem understand
First, thanks for giving me a time stamp, that makes it soooo much easier to find! Second, I found the lowest common denominator at that point. For 500 and 200, the LCD is 1000. To make it so I'm not actually changing the value, I had to multiply the numerator by 2 and 5, respectively ( 1/500 = 2/1000 and 1/200 = 5/1000). Once they had the same denominator, I could add the numerators. Let me know if that clarifies things!
@@CircuitBread Yay! thankyou very much for this and to this series. Very much appreciated
What is a reference ground?
Reference ground is the voltage level that you are using as your baseline - your reference - that you assume is 0 volts. As voltage is relative (it's the potential difference between two or more points) you can just say that one is at "0V potential" or ground and everything else's potential is just given relative to that arbitrarily chosen ground, higher or lower. It's not really all that complicated, I fear this explanation may make it seem more complicated than it is.
great lesson :)
Thanks for the video, but when you start explaining with the example at 5:18, it’s hard for me to tell what’s going on because you’re not zoomed in to the sheet of paper, I can’t really read any of the values.
Just some feedback - thanks for your videos!
Thanks for the feedback! We'll try and get more zoomed in on the sheet of paper going forward to make sure everything is legible.
Where is the new video ??
We thought we'd gotten through some logistics problems, but we haven't... 🙄 We have the KVL video queued up, I'll ask Laren if we should publish it tomorrow.
dude , at 18.07 v2/200 why you put the value of v1/200??????
Hey Awais! At 17 minutes, it mentions that V1 = V2 and that's because R1 and R1 are in parallel, so the voltage across them is the same. Hopefully that helps, if not, there's the tutorial on series and parallel circuits here: th-cam.com/video/kpeNF-qCVBk/w-d-xo.html
@@CircuitBread THANKS BRO, IGOT IT .
Good topic. Not fun to calculate lol.
Yeah, that's still my weakest point. My oldest is in Jr High and taking algebra and as she's asking for help and I'm working with her, it just reminds me that the hardest part of calculus and engineering is the algebra... My opinion, at least.
Most of us struggle because ...
well where is the resistor in real life how do you measure those currents and so on we all have that boring diagram since highschool yet not practical conformation of the stuff working...not to disregard your efforts but if it were on the breadboard it would have been much better ... I never met an electrical engineering graduate who can make a working amplifier why they spend more on memorizing equations than on real electronic components.that is why even highschool dropouts exel at building circuits because they are not slaves to the old digest and regurgitate vicious cycle lol
What you talk about
I'd love to help you out - could you be a bit more specific?
Nerd!!!!!
Ha! My eyes are actually starting to go a little bit, so I've started wearing glasses the last six months. But I take them off in the videos so we don't have to worry about glare with the lights and every single time I take them off, Glyn, running the cameras, says, "Yeah, we don't want anyone to know you're a nerd!"