Ohm’s Law Tutorial with easy practice problems | Basic Circuits
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- Опубліковано 8 лип 2024
- Ohm’s Law is the foundation of circuit analysis and so we decided to make an Ohm’s Law tutorial, where we go over what Ohm’s Law is intuitively and mathematically. Finally, Josh uses some examples and goes through some easy Ohm’s Law practice problems to see it in action. While simple, the intuitive understanding of how voltage and current are related is essential to working with electronics and practically anything in electrical engineering fields. We highly recommend you check out the written tutorial for a slightly different delivery and more practice problems - www.circuitbread.com/tutorial...
We appreciate Ohmite supporting us with this tutorial. While they manufacture many passive components, they are perhaps most famous for their resistors and obviously the name of their company comes from this specific topic! To see some of their resistor offerings, please go check them out at www.ohmite.com/ceramic-compos...
And if you find this interesting, subscribe to the CircuitBread channel for more electronics tutorials on beginner and intermediate electronics!
Table of Contents
0:00 Introduction
0:34 The simple yet flexible math
1:34 Linear relationship between voltage, current, and resistance
2:16 The simplest example of how Ohm's Law works
3:38 Ohms, mhos, and Siemens to represent resistance or conductance
4:51 Short circuits and open circuits and how it's shown in Ohm's Law
6:38 Example with two positive voltages and a single resistor
9:13 Example when current goes backwards from our assumption
12:14 Example with two negative voltages and a single resistor
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Our Friend of CircuitBread, Ohmite, is supporting this tutorial! They manufacture a lot of passive components but their specialty is resistors and we think they're a great resource for seeing what some of these electronic components look like in real life. We recommend you go to their site at www.ohmite.com/power-resistors/ to see what they're like and if you want to get some for your experimentation!
Those a probably the best electronic tutorial you can find on this site. Simple, clear and useful. Very good job
Thanks Aris! I appreciate the feedback!
UA-cam is amazing. Your channel is also amazing. Where else can a person get a free education? Thank you for these videos.
This was amazingly helpful and i cannot overstate how helpful the analogies and focus on intuitive framing have helped me! Amazing channel!
Where has this channel been all my life in school, 😭😭,
Good work, great video, thank you sir..
Thanks for the feedback, I'm glad these have been helpful!
even my College Proffesor won't teach like this
who cares about handwriting ,
the thing is I understood something ! and that's a blessing from lord.😁
Thanks for that nice explaination, it helped me alot.
I like your videos, they are easy to understand and I learn a lot with them. Regards form Argentina.
Awesome, thanks for the feedback Giuliano!
Very well done, thanks. I’m not a formal student of electricity, but a trying to understand the basics for purposes of putting together a solar array. I think you’d do well to offer a 101 course in solar power. I think the thing that confuses non-professionals such as myself is a lack of feel for “normal” volts, “normal” range of Amps, etc. I bet you could deliver.
Wish you were my college professor, 10 hrs of my college sir is shit,while just ur 1 min of the video is much interesting and understandable .
Thanks! And while I appreciate the comments, I have become more sympathetic with (most) college professors or high school teachers. I do not envy them...
Thanks for this, it was helpful revision for me!
Glad it helped!
great video thank you
@9:30 can you explain how there are 2 voltages? and why you subtract them?
I like your videos, I'll be sharing them to supplement my instruction! I'll be teaching basic electricity and electronics principles. :)
Awesome! That's actually the reason we started doing this Circuits 1 series. The professor that helped give us technical feedback on the semiconductor scripts/videos switched to teaching Circuits 1 this semester. We thought it would be good to help her in return for her help. We're running a bit behind on getting these out, so I'm not sure how much help we'll be this semester but hopefully next semester! We do have a couple more unlisted videos live on our website, but even with those, we're only about a third done with the series we have planned.
your channel is incredible, it's awesome, very high quality video and very clear audio and very clear explanation
please make a video about igbt (insulated gate bipolar transistor), there are only 4 videos explaining their internal structure and none have your animations that is very nice
Awesome, thanks for the feedback! A video about IGBT's is a good idea - we have a lot in the works right now but I put it in the queue to make sure we remember to do this one. Thanks again!
Missed this videos
fantastic explanation :)
All videos are so well presented and explained. I generally use the letter R instead of omega, not that I have anything against the symbol, just easier 🙂♎️
Units in general have always been a weakness of mine but, unrelated, for some reason, I've always like the omega symbol. Not sure why!
Thanks!
no matter how strong my source (imagine a huge capacitor) is, if i have that voltage and that resistance, i will get the calculated amps?
Yes, if your source is sufficiently large (and your resistor doesn't burn up/explode with too many amps), and all other real-life issues don't happen, then Ohm's Law will hold.
@@CircuitBread thank you
At about timestamp 08:00 you have 15v-5/ 20 Ohms = 10V/20 ohms why not 15v+ 5/20 ohms= 20V/20 ohms?
don't really get the -ve volt thing? please help
What happens to I and V when resistance is futile?
I have a question. Does that means bigger the load (resistance) will give more battery life?
That is correct! Keeping the same voltage, increasing the resistance means a smaller current which will mean less power. We typically say a "bigger load" when something has a smaller resistance, though, as it requires a "bigger" amount of power.
@@CircuitBread Thanks.
What about the watt in car audio? I know that V= square root (PxR) can you explain? 🙏
That's actually pretty straightforward. Power (in watts) is voltage times current so the amount of power that car audio puts out is simply that - how much current the amplifier(s) can produce without clipping. There are 4ohm and 8ohm speakers as common options, which affects how much current is needed for specific voltages.
Thank you so much for these great lesson lets see if I can " Give something Back " : In reference to your terrible hand writing, (I didn't learn this until I hit my 60's) you need three fingers to write properly, most people who have better controlled writing, use their middle finger to lead / dominate the writing, I noticed that you use your index finger to dominate, try letting your middle finger take the lead.
It worked for me, it might work for you.
Thanks for the advice, I'll try it out and see what happens!
@@CircuitBread I think you will notice an improvement almost immediately. Keep me posted. I'll be around for a while, I just started and I'm in for your full course all 102 videos :)
Can someone explain to me why 15V was substracted to 5V?
Hi Rey! We used that example specifically to show that the most important thing to think about when looking at the voltages is the difference between the two voltages. So, even though one side of the resistor is 15V, since the other side is 5V (and not 0V), then the actual voltage drop across the resistor is 10V, not 15V. I attempted to explain this at 8:25, hopefully it helps!
@@CircuitBread sorry, I got confused when you mentioned "node". I don't have any proper education about electronics so the terminologies got me confused.
@@CircuitBread and last one sir, why exactly we need to know the differences between voltages why not use addition or other operation?
@@CircuitBread ahh okay I just searched in google and it says voltage is the difference in charge between two points! I understand now thanks.
Glad you figured it out - it's a crucial part of understanding circuits. Now that you got it, you've got a stronger foundation to move forward!
What are miliamps
Edit- and how do you convert them into miliamps
Milliamps are just 1/1000 of an amp. So you can multiply amps by 1000 and that'll give you the amount in milliamps.
@@CircuitBread ok thanks
Isn't the result of dividing by zero technically "undefined" rather than infinite ?
ua-cam.com/video/1V3IgB5yfIY/v-deo.html
That sounds like a question for mathematicians, as for me, "a really really big number" and "an undefined really really big number" is, practically, the exact same. That's probably just the engineer in me coming out, though. 😃