Ohms Law for Normal People - in 5 minutes
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- เผยแพร่เมื่อ 26 ส.ค. 2022
- I promise you, you will understand this. Do not be put off just because it's maths. This is a simple puzzle. If you can't understand Ohms Law previously, then try this video - or your money back! Kind Regards, Callum (M0MCX).
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When I was new to all this I looked at the size of the numbers and their relationships. If you're taking a test and there are three possible numbers to this little triangle like 5, .001 and 1000, and maybe you have to figure one of these. Currents, unless your talking mains supplies, are usually small, that must be your .001. 1000 probably isn't a voltage, must be a resistance, 5 sounds like a reasonable voltage. Take away one of these and do math to figure it, you can use these estimations to see if your answer is sensible. If you're given 5 and .001 and you get .1 for a resistance, you probably did something wrong or used the wrong formula. After a while you see that relationship in your head and do it on the fly while looking at a circuit diagram. "So ya, the voltage here should be low, single digit, with almost nothing for current, it's just holding this pin high."
Nice analysis!
A great way to approximate the numbers. Often that is all you need. Brilliant.
Appreciate what you're saying, and just got 0.005 as an answer. But Not aiming to build circuits, just want Foundation to chat with other Hams and get that good old community spirit! @@DXCommanderHQ
Great refresher on stuff I learned 50 years ago, but don’t use enough to keep it fresh in my head.
I've been doing this for years, but your explanation is really simple. Wish I had been taught that way originally.
Reminds me of many years back when I had to find out what "Peek & Poke" were in Computer programming: Boolean Logic. Took me almost a year to find a simple explanation! "Imagine a Hotel Pigeon-hole Letter rack. Floors are a, b, c, etc. Room numbers are 1 to 10. Apply this to Memory spaces. Imagine you want to see what's in Memory slot A1. You 'Peek'. If you want to save a piece of info or programme line, you can 'Poke' it into slot C5, for example, after first 'peeking' to make sure it's not already used." !
This chanel has helpt me alot. And i love the live streams. I live in middle of Sweden (Sundsvall) i listen with a MLA30+ loop antenna and a Malachite sdr radio. I heard the transmission from a livestrem once. Keep up the good work
Fabulous! Thank you for the comment!
Hi Cal,
Another fine video. I always had seen E for the voltage in the formulas and was told a way to remember the associations. It may seem a little funny but we have an Eagle for E, and Indian for I, and a Rabbit for R. The Eagle see the Indian and the Rabbit E=IR. The Indian sees the Eagle over the Rabbit I=E/R. The Rabbit sees the Eagle over the Indian R=E/I. I've never been confused remembering it that way. 🙂 You and the family stay safe. 73 WJ3U
Great tip!
When I started my radio trades apprenticeship we learned about Coulombs, then Ohms law.
The size of the numbers when dealing with Coulombs just totally did my head in.
Apart from the occasional sarcastic comment I rarely consider Coulombs st all.
Your explanation of Ohms law is soooo much easier to understand.
I can't wait to see how simple you can introduce Watts to the equation.
Peter, yes - most people explain things FAR to complex. I'm a simple man!
Ohms law made simple. Excellent......
Glad you liked it
My dad was an electrician never got it I was an apprentice just got that book u waved about cause I want ham license and u have just explained it the book said the same thing with the thumb over but u made it understandable I'm number illiterate or thought I was 👍👍
Thank you I’m gonna go take my test now. I’m in the category the intimidation factor has been eliminated. Thank you again.
Brilliant!
I've always been weak in math but took as many courses in school as possible just because I was weak. As I always say "Algebra has saved my life many times over." Great explanation for the formula that frightens many new hams. Thanks!! Jack K5FIT
Thanks for sharing!
Oh, I'm eager to see the next episode and the moment when Callum will be talking about Leonardo di Caprio. That moment when the power triangle fits into the Ohm's triangle, but it works in reverse, and Ohm's triangle can be put in any place of the Power triangle - total "Inception" movie with the simple rule same as in the movie: "Don't dig too deep or it will blow your mind"
OK, so I have a simpler method - but it really only works for Foundations students, I didn't over-complicate it. It's already uploaded!
Thanks for the informative video.
Thank you very much. Just started for Foundation and got stumped; as never did Algebra at school, or any decent Math's come to that! I'm sure it's got to be easier just to look at the labels on the radio, battery or lamp though! :-D
Best of luck!
Collum… I appreciate the simplicity of your video presentations. Was looking for radio reviews completed by you. Some hams would like to know if all the functions of a new radio work or not, period. Looking to buy my first HF rig with waterfall displays. Why? It’s like buying a car with power steering and air conditioning. It is a must in my book. 73 de KD6UYK (Tim).
Cal, first of all thankyou! I live and die buy this equation on a daily basis ( electrician). Two other take aways from this equation that apply to life. 1. Math is right or wrong. There is no" grey "area. 2. This specific equation can be used as a " litmus test" on situations in life you do not have the full knowledge of. Example: DX COMMANDER/ QUALITY x VERTICLE antenna.
The first example was a easy one. Meant to bring a smile. But apply it to politics, health care, anything a person may need to discern in life. It helps with one's journey through life!
Thank you cal I only did the foundation course 2 years ago thanks to watching your videos. Helped me alot being not a good at taking in things in my brain. M7MXM Chris.
Great to hear!
Hi Cal, Enjoy your videos! Thank you for being a mentor!
I appreciate that!
Great explanation, thank you.
You are welcome!
even us advanced operators need a refresher sometimes
Learned decades ago E= I x R and it came within a triangle 😁 c’est la même chose! 👍👍
Well explained Cal! Stay safe my friend. A.
Thanks Andre!!
Once again Callum, you nailed it.
Tnx Ed!
Short and to the point. Thank you Calum.
Just Brilliant! :) Great explanaition! :)
Thanks! 😃
very well presented and easy to follow
Thank you!
Excellant video Cal!
Thank you very much!
Thats awesome Callum, Your a great teacher! Keep the vids coming. 👍
Thanks 👍
DC Current is proportional to voltage , e.g.. 2 x voltage = 2 x current . And current is inversely proportional to resistance , i.e. 2 x resistance = 1/2 the current .
Wattage is just volts x amps e.g. 2 volts applied , with 1 amp flowing = 2 watts disipated .
In a DC circuit with just resitance that's is all there is to it .
Just like the big guy said , easy peasy .
73's all from Chris @ G4MXC
Now teach it to folks who don't want to know... :)
Nicely explained, and I'll be looking forward to the next one! As a kid, I taught myself both of these calculations while working with some loose Radio Shack car speakers I had come across and wanted to hook up to my bookshelf stereo. The only specs that were available -- and this was before the internet, so I had to actually go to my local Radio Shack to get them -- gave ratings for a 6 ohm system, whereas my stereo was spec'd at 8 ohms, so I had to figure out the maximum RMS and peak wattages to ensure I didn't blow the cones out. Then, being a kid, I cranked them up and blew them out anyway! But hey, the knowledge has been useful! 😂
Haha!! Been there! :)
Thank you for your content Callum!
My pleasure!
Great video!! my 8 year old son got it straight away
Fabulous!
Great Explanation, Thank You!
You are welcome!
Thanks that makes it easy to understand need to get myself a notebook for reference
Great!
@DXCommanderHQ are all the videos in this playlist everything you need to pass the foundation exam
Calum, that made so much sense, it was easy! I can actually remember that one...now at age 51. I wish I had you teaching my algebra class, when I was in high school. That was like watching paint dry. Always learning! .... Thanks 👍🏼😃
Wonderful!
Thank's for making me understand
Nice one callum
Another great video Callum thank you for sharing, doing my Intermediate today so fingers crossed :)
Best of luck Billy!!!
@@DXCommanderHQ thanks Callum
Explained well, thank you.
Thanks!
Good stuff callum,,, 👍
Thanks 👍
Great simple explanation. Thanks for posting. Liked and subbed.
Awesome!! Thanks for the sub!
I wish you were my teacher back then in school. I think I would have understood the explanation then
I never understood my teachers!
Always watch videos because you always learn something!
Thanks Tim!
Great simple way to explain ohms law !
Glad you think so!
I've always remembered it as VIR V=IxR, so V at the top of the triangle and IxR at the bottom, but basically the same. And PVI the same way.
Thanks for this video (and all the others), it prompted me tonight to have a quick look at the exams available. I trained for the full exam back in the 90s when I was at school, but never sat the exam as a teenager. I've not done any training since, and on the mock exams, I scored 25/26=96% on the Foundation, and 30/46=65% on the Intermediate, so with a small amount of recap, I'd hopefully be in a good position to pass if I end up going for them!
Yes, you can go STRAIGHT to the full. I'm sure you would do well. Nice little tick in the box!
Great video. I am from New Zealand and studying for my license but having problems understanding resistors in parallel, the study material we have doesn't do a good job of explaining it.
Speak to Roly, he's in NZ. Track him down on QRZ dot com and ask. He used to teach this.. Failing that, drop me an email.
Great way to simplify ohms law.
Thanks!
Wonderful Job...as always!!!
Thank you so much 😊
Thanks again, nice explanation.
Thank you!
LOL Gnome's law is really difficalt, Good job i passed the exam
V=IR Push effort required is determined by the restriction in the pipe times the volume of stuff being pushed. V = IR . "VIR" is latin for "man" (hence "virile") Just how I remember it......
Typical Tom! :)
very nicely summarised. Thanks for reminding us how simple it really is 😃
My pleasure!
Brilliant! Bingo! Thank You.
Welcome!
You made so easy even I can understand it! 😁
HAHA
Every little helps Callum., sometimes you just need someones way of explaining something, not everyone has a good way of breaking down a problem. I want someone to break down the scientific calculator steps needed to work out the calculus in the inter and full licence exams.
Oh heck, that's beyond me!
When I took my Foundation I learnt the required formulae inside out. Then on test day I didn't get a single question on them... hi hi!
HAHA - woops!
Always brilliant very good man
Great video like always. Keep educating the public. Hope you're doing well.
Hey, nice comment, thanks. Stay safe yourself :)
Nice one Callum
Nice of you to do!
Great!
Easy peasy. Thx
Good job
Thanks, Cal!
No worries!
Thanks for sharing!
Thanks for watching!
i wish you were my teacher looooong time ago
Thanks for this video! Makes sense to me now! #ThumbsUp
Glad to hear it!
:Nice one Cal. Wish I had been taught fractions by your method! 73 Jim M7BXT
Fractions! Gulp :)
It's not just a rule Its the LAW 😉
As usual C well done .
Excellent
Thanks
I'm surprised you didn't use the "rule of thumb triangle" (ie, put your thumb over the number you want and see the result you want). Works, obviously too for P=IV. If only there was something so simple for the hideous calculations you need for a Full License. Tony. 2E0XTB (but I much prefer M7TXB).
Thanks!
Welcome!
Ohm's - it's not just a suggestion; it's the law
HA!!
As an electrical engineering lecturer I am watching out of curiosity. I’ll edit comments after watching… lol
Ha! Yes OK!
@@DXCommanderHQ excellent explanation of the maths Callum. I was only disappointed you didn’t explain “ohms law” itself. Such as relationship between current and resistance.
But for foundation exam etc, excellent job sir 👍
@@DXCommanderHQ I fear if I did such a video it would become way too over complicated and like level 5 studies… 🤪🤣
Hi Calum. Thanks for a great video. I’m off to order my foundation course and get into Ham radio. Thanks for the email too. Dave.
Brilliant!
For the algorithm. Godspeed
Thank you!
Tnx
Dead simple. What about V being a fraction or decimal value say 13.8 is that a possible accurate equation?
Fractions / decimals work, of course. But I might have missed the nuance of your question sorry..
U=IxR (Volt = ampere x Ohm)
A period after an equation. It's not a sentence. No period! LoL
Ah
As a G7 i need a reminder now and again
Yes!
Thank you for the video! :) ... and also that algorithm? :/
Haha yes!
Gr8
👏👏
take my money....LOL....Any plans for maths for intermediate?
No :)
FT8 on 10 meters is like fishing...
It's all fishing :)
@@DXCommanderHQ I'm gonna set up your DX commander soon for another tool in my arsenal 🙂
@@DXCommanderHQ a guy in my club (Ogden Amateur Radio Club) claims to have sent you the cut chart that you provide for the build
OHMS Law, you’ll be part of the resistance 🙄
A Love Triangle :)
😎👍
Hey Bob! Nice to see you in the comments!
@@DXCommanderHQ Thank-you. I don't comment so often these days. Trying to catch up is hard enough. I do give you a 👍 though.
👍 C4YT (Comment for TH-cam) 😊
Thank you!
Watts law
Soon!
Earth over Rode Island
Collum… I appreciate the simplicity of your video presentations. Was looking for radio reviews completed by you. Some hams would like to know if all the functions of a new radio work or not, period. Looking to buy my first HF rig with waterfall displays. Why? It’s like buying a car with power steering and air conditioning. It is a must in my book. 73 de KD6UYK (Tim).
OK so the reason I don't do radio reviews is that frankly thay ALL work! I would be talking baloney for 10 minutes :)
@@DXCommanderHQ I was referring to newly released radios from other countries. I supposed the ham radio community can be glad that the major manufactures completely test their radios before they’re sold. (There are cheap radios out there Xiegu, etc. that they’re doing a disservice to the ham community (by not fixing the issues) and hoping (as a ham) wait for newer firmware releases to fix problems. Better to save my money and buy a solid radio (Kenwood, etc). 73 de KD6UYK (Tim).