WOW! You are the best... i've watched a lot of videos about series and parallel connections,but still confused, fortunately, i came across this video and this really helped me a lot.. i have an exam tomorrow, and this will definitely be of great help, please continue making more videos of this kind... :)
Thanks Louise! Good luck with your exam! :-) If you have specific problems in the course, feel free to send them to me and I'll solve some in my weekly video: info@redmondphysicstutoring.com. I also have lectures for most of the course available for free at Udemy: www.udemy.com/user/scottredmond/
Kirchoff's rules apply for all circuits, even with multiple voltage sources. For the loop rule, when you cross a voltage source you add the voltage if you go from negative to positive and you subtract the voltage if you go from positive to negative. I should have some examples... 1) This video has two voltage sources and four resistors. At Vanier, E&M students were almost guaranteed to see a question just like this on a test or exam. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-wNSIvuFBDPU.html 2) Last week's webinar (ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-xko9D5rLgok.html) has an example with three voltage sources. This video is 30 minutes long but the pace is more realistic (and you can always speed it up). 3) Another video with a tricky circuit with 5 unknowns and two voltage sources: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-XtkXRTfRGeI.html This video is only 9 minutes long because I sped up the algebra.
Struggled through a whole EM physics course without this knowledge. Now, I'm taking an upper div electronics course and in a moment of desperation on a complicated DC circuit went to RU-vid. This makes everything so much easier!
Oh my god this is a life saver!! I have been so confused about this topic and watched so many videos that did not help but finally i understood it thanks to you!!!
Thank you very much!!! I am not such a fan of physics xD but when I find teachers like you make it better to learn, you made it so easy to understand :D
Very fantastic video such an extrodinary video I was struggling from 9th class to understand but i understood now in 1st year degree thank you very very much sir . Keep continuing like these videos to save students time .
Great vid! I have a question: About the statement: Any elements that share the same two colors are in parallel. Is it also true that any elements that share two OR MORE colors are in parallel, or not? Also, you should say that if a wire connects only 2 elements, and those elements have the same 2 colors, then those elements are still parallel.
Good question. At the intro physics level we never saw any elements with more than two terminals, so each element could only be connected to two wires and it was impossible for any elements to share more than two wires. If you add 3-terminal devices, such as transistors, then it's beyond what I've taught but my gut feeling is that you can't say they're always parallel. It would depend on where exactly the current is flowing at any given time, so it could change as the circuit adjusts. If a wire, say it's green, connects only two elements, then those two elements share the green wire. If they also share another wire, say it's red, then they are in series and in parallel. We can see this with a pair charged capacitors that get connected two each other. However, in that case thinking in terms of parallel and serial has often mixed students up. In my experience, at that point it was better to focus on applying Kirchoff's voltage rule when solving the problem. I hope that helps. Good luck!
Hi, This video was helpful but does it work for all circuits ... sorry but i got few basic circuits and this method does not seem to work....its been long time im struggling with this series and parallel thing...any way to contact you? i won't take much time. .it would be great if you could check my circuits
Great video but I have a question. I can't get this to work with a circuit I have that uses a transiter with three connections. I'm very new to Electronics and this is really confusing me. Can only resisters and capacitors be in parallel or any component be in parallel? Also how does this method work with my transister?
Great question. I haven't taught circuits with transistors, so I recommend checking with your prof. The approach in this video will work for elements that only have 2 terminals. I can imagine circuits with transistors wired in parallel, but they're not very interesting or useful circuits. I'm sorry I can't be more helpful. Good luck!
its cool and looks like it makes it easy but it would be nice to get some values in there and completely solve the circuit. I mean what do I do after I solve everything the lines up and im left with resistors and Vs that doesnt have the same colours and I can connect them? Where do I go from there?
Good question, and unfortunately there's no single answer - it depends on the problem. Once you've simplified the series and parallel circuit elements, we move on to the next step. For equivalent resistance or equivalent capacitance problems, we can substitute the numbers and determine the equivalent. I'm guessing the one you have in mind is harder than that though. I'd suggest asking your prof or teaching assistant. Good luck!
@@RedmondPhysicsTutoringVideo I figured it out. Lol if I'm left with resistors with different colours then it means I didn't match them up correctly. This method works really well for people doing basic circuits all the way up to Thevenins if you get the method down correctly. Haven't had a chance to get it out with Norton's theorem but Norton and thevenin are kind of the same so I would assume that it would be ok. Do you have any tutorials on using the mesh method?
That basically is a node concept. Across all points in a node the potential is same. And you identify the two same nodes on either side of the element, if they are same, they are on same potential difference and hence in parallel. I guess that's the technical explanation behind it.
+varun sai Do you mean to record these videos? For this video, I used Audacity to record the audio, Gimp for the drawing, and Camtasia to record the screen and edit+produce the video. In the year since this was recorded, I've streamlined my process a bit by recording the audio and video at the same time, and using Ink2Go instead of Gimp so I can record in 1080p.
Nice trick but will this trick help when the resistors are connected in a shape of a triangle,i am not getting it right....this is the only doubt i have as i am not getting the right answer.....
This only helps with determining parallel vs series. If 3 resistors are connected in the shape of a triangle, this trick will show that they can't be in parallel. They might be in series, but only if there are no other connecting wires and that makes for a pretty boring circuit. You might have to apply Kirchoff's laws to solve your problem. Good luck!
I think it would be a parallel connection. Imagine that you combine (R3 R4) to get a resistor R34 of resistance: R34 = (1/R3+1/R4)^-1 Then combine (E R1 R2) to get a voltage supply ER12 of E volts with internal resistance R1+R2 Finally combine (R5 C) to get an electrical component CR5 with R5 resistance and C capacitance. As you can now see, all three components share the same colored wires (red and yellow), and thus form a triple parallel connection. This means there will be two current loops in the circuit. Using Kirchhoff's laws, the first (clockwise current) loop, made up of ER12 and R34, will have the following equation: E - R12*I1 - R34*I3 = 0 -> E - (R1+R2)*I1 - ((1/R3+1/R4)^-1)*I3 = 0 The second (clockwise current) loop, made up of R34 and CR5, will have the equation: -R34*I3 - R5*I2 = 0 -> -((1/R3+1/R4)^-1)*I3 - R5*I2 = 0 where I1, I2, and I3 are the currents passing through loop1(clockwise), loop2(clockwise), and R34 (from top to bottom) respectively and I3 = I1-I2
I might be missing something, but I believe that if there are no junctions then there wouldn't be any wires connected together which would make for a boring circuits problem. Sometimes elements are neither in series nor in parallel, and then we have to use Kirchoff's laws - the loop rule and the junction rule (but then again there are junctions so maybe that won't help you)... Can you find an example problem online and share the link? Maybe I'll be able to help after seeing it.
