Teaching Ohm's Law to Techs - Part 2
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- Опубліковано 17 жов 2024
- With very simple materials you can teach Ohm's Law in a way that eliminates the fear and frustration most students have, AND you can help them understand that the concept is very important and useful.
Adding a wire is basically creating a fuse. Old fuses are simply just a piece of a conductor which is rated for a specified amount of amperage. More modern day fuses are still the same but some have feature like time delay. Thats all fuses really are. Each wire is a particular thickness. The amount of thickness is what allows specified amount of amperage to to flow through it without it burning up. For example, a #14 gauge solid copper wire is rated for 15 amps. If you were to use a piece of that as a fuse it would hold up nicely. However, each wires current carrying capacity can vary on many different things; what the material is (copper, aluminum, gold, silver, etc.),whether its in solid or stranded form, ambient temperature of location, whether its used for continuous use, etc. That alone is great for experimenting with. You could even put a meter and a variable resistor in the circuit and watch the amperage blow the homemade fuse. You will get a good idea on the actual restrictions for your homemade fuse.
Not completely understanding overcurrent protection devices like fuses/circuit breakers is why so many people have house fires. Some DIY people will perform work in their house and change out circuit breakers for higher numbers. They do not realize that circuit breakers/fuses need to be correctly sized to the current that the circuit draws. If the breaker/fuse is rated higher what the wire can carry for ampacity, the wire will heat up and burn before the fuse or circuit breaker will pop resulting in a fire but if your lucky, the fuse will just break. It is really neat to see on a board though, and as you get a little higher in amperage and wire size you will see it glow red and yellow before it pops. Its worth seeing, as long as you do it safely and correctly.
Overall this is a great video and idea. A good chance for people to learn at different levels and job positions. What I do is I use a "snap Circuits" kit i bought off amazon for $50. I had bought it for my boy to teach him some of the things i know. whats great about this is it can be modified really quick and many different ways. It comes with switches, power supplies, resistors, variable resistors, motor, lights, capacitors, amplifiers, speaker etc...... Everything is encased in plastic and required no soldering. Every component also has both positive and negative spots on it to put meters in line. It also has a book that shows setups for about 300 different projects....They all snap in place on a board very quick. Either way is a good way and i highly recommend learning hands on. It just makes much more sense For a quick generalized reference you could refer to the National Electrical code book, Article310; Table 310-16 for a generalized list of wire sizes and their current carrying capacity.
I just got into learning about electrical.... This actually makes sense. That you so much for bridging the theory into something useful.
Hands on. This is so great!! If I had a teacher like you, I would pick things up and understand difficult concepts more easilly. Things wouldn't be so daunting for me in the math department.
Could not agree more with this video's last statement concerning "hands-on" learning, with Ohm's Law & most other things
Dan, I LOVE your alternative soldering method! Never was taught that way before and it's SO much easier! Thanks
I'm a lab instructor at a trade school, & we've got a fundamental problem using Ohm's law when we Calculate R using our Measured voltage(126v) divided by our Measured current(.323A) = 390 Ohms. Which is way, Way, WAY too high, doesn't make any sense. When we Measure our R w/ the meter it's about 10.5 - 12.5 ohms. Measured Voltage(126)/Measured R(12.5) = 10amps. Again, way, Way, WAY too high, doesn't make any sense again. We use 40watt incandescent bulbs mostly, sometimes it's a 60 or 75 watt. Do you know what we're doing wrong?... Thanks again, - take care.
Mr. Dan, I recently found your channel and I must say, they are very insightful. Please continue to teach us and make amazing videos.
That was great , the lead fuse is something I would not have thought ever, glad you stumbled across it. I will have to do some testing to find out what amperage melts the solder. Very use full for electronics if it does react at low amperage. Thanks Steve.
Thanks Mr. Sullivan for an enjoyable Ohm's law lesson.
Thank you very much Sir! - even grannies can understand it now. I never paid attention in school - Thank God for People like you.
Thanks a lot for your quick response. I am new to teaching at my local community college and you have given me some great ideas. I look forward to more videos in the future. I just informed my boss to purchase your FET book for every student and i'm also pushing to get your load pro tester in class. Thanks again your a great teacher and I look forward to using your methods to teach my class.
About the end when you use the peace of solder as a fuse. I do work with Ac/Dc inverter and a small trick to be sure you do not invert the + and - ( when no indication ) is to connect one of them with a small solder core ( No load on the inverter !! ) it is not the best way but it save the electronic circuit. By the way. I love you teaching style and the way you do those video, quick and sharp.
This is an experienced teacher sharing wisdom of how to teach noobies the right way :). Thanks for posting. This was very insightful
Excellebt Lesson! Simple, Easy, Detailed, and what better way to end? Brilliant Sir! i wish you were had been my professor. THANK YOU!
YOU'RE WELCOME!
Yeah, I do, and to be honest, it's guy like you that make it important for me to get this info out there. We really do do a bad job of teaching electricity, but it's hard to blame the guys teaching it. They're doing it the way they were taught, by guys who were taught the same thing. Do me a favor and spread the word about my videos. I obviously hope to make a living doing this, but I can't imagine not making a difference while I'm doing it. Thanks.
Thanks for the videos I purchased load pro and your book for my shop a while ago and am going to start using the load pro for diagnostics on vehicles. I am a small one man shop that does general repair from check engine lights to things like engine swaps and every thing in between.
This was an awesome video. My nephew, who is 11, and now lives with me, is forever rewiring his toys to do different things. His interest and knowledge is self-obtained via trial and error, prior to his arrival. He recently discovered my Voltmeter and began experimenting with circuity and number calculations. Looking for ways to guide and channel his natural interest, in a direction of his choosing.
Current was there - just not enough to make visible light. The voltage drops give it away. The lights need way more than millivolts to work. Good job.
Thanks Dan...... You do an EXCELENT job teaching the material. I'm up on all the youtube controversy and I've read the comments, messages boards etc.... I just don't get it... outside of what may have just been "Piss-poor communication".. I have learned a great deal from all of you guys combined, but your stuff is just explained and demonstrated clearly and sometimes comical which always makes learning a bit easier. I've read, re-read and studied your shop manual to get a grip on the basics and fundamental concepts....and I ordered the Loadpro. I watched all the reviews looking for the hidden bullshit controversy... all bullshit as expected. I own the PowerProbe also. What is the big deal man... AS YOU have said many times over, Its about bringing multiple, sometimes better and faster techniques to the table(shop)...and whats the problem with having many diagnostic tools at hand anyway!! ..WTF is the big deal.. I'm very appreciative for all I've learned watching and reading your material. Thanks Dano
I teach in Northwest Arizona. I'm roughly 3 hours from Phoenix. I'm not sure if your FET class is anywhere near here. I would love to sit through it. The way I learned in college was nowhere near as easy as you've made it. I'm looking forward to using these ideas to become a better teacher.
Solder fuses... so this is how discoveries are made.
Thanks Dan. The "2nd hole in a bucket" analogy helps. So if you wired those bulbs in series then the amperage would not change (no extra holes in the bucket), and consequently they would not burn as brightly. The bulbs *do* supply resistance, but they are not resistors per se. Is that about right?
Love the use of the ladder logic, because im also trying to learn PLC programming, Thank You, I'm learning these symbols too
+otis shane sharp Be careful - ladder LOGIC uses TRUE and FALSE, and the ladder SCHEMATIC symbols for relay contacts is backwards. Don't let yourself be confused by the similarity.
Ohm's "law" is rubbish.
Ernst Stavro Blofeld Care to elaborate? Or do you stand by your random, hyperbolic problematic pseudo-axiom?
Daniel Sullivan Can you seriously not see it yourself?! It is quite obvious.
Daniel Sullivan I give you a hint, which I shouldnt, if you are really an electrical engineer.
What would every 10 year old, given a car battery and a bottle of liquid nitrogen and a supra-conductor, do?
More fun too. If the students are allowed to work with a lot of freedom, it makes it easier for them to experiment, and to work at their pace. Also, it eliminates a lot of work for the instructor.
A nice methodology for visualizing, and a good deal easier for a newbie to follow than jumpers on a breadboard (which obviously do essentialy the same tasks.)
One thing confused me a bit. When you cut the non-resistant ground leaving the 500 ohm resistor, the lights went out. Was that because 500 ohms of resistance blocked all current flow, or simply that it reduced the current to a level that was insufficient to cause the element to emit visible light? Or am I missing something?
You almost got it. If you wired them in series, the resistance WOULD double, do current would be half. The bulbs are always resistors - it's how you wire them. In series two 100Ω resistors equal 200Ω. In parallel they equal 50Ω. The problem is that people forget that MOST current takes the path of LEAST resistance. Not all of it.
Thanks a lot Daniel for a very informative and understanding about how others or one is taught. And not be bamboozled back to front, like us students who is studying it right now.... :( by ohms law :/...
It will be my pleasure to spread the word you really are a great teacher thanks you for your great Videos.
Also Is it a good idea to use the pie chart to show the different calculations? Instead of using E/IR I Could use V/AOhms that way they could still cover the letter and see what to multiply or divide to find that covered letter.
is the FET Handbook still in print? if so, where and how to get it. Website no longer exists and not on Amazon
Hi Mr. Daniel! Thank you so much for posting these wonderful videos! I have learned so much in such a little bit of time. I plan on educating myself through your electrical videos. I do have one question. I want to try this "Ohms Law electrical experiment at home."I noticed that you used alligator clips for power supply. What is on the other end of the alligator clip to supply the power? Meaning to say what end and also what is the end plugged into to supply power?!? Sorry for my lack of knowledge lol. When you get the chance, please write me back at your earliest convenience. Thanks, John! :)
Pretty much anything you can find. 12V battery (what I use), 9 D batteries soldered in series, a computer power supply... Doesn't matter. You can use an old plug-in power supply for a hard drive, a radio, or anything else. I suggest at least 9V DC - but 12VDC is best.
Daniel Sullivan Hi Mr. Daniel! Thank you for your quick response and informative answer! I'm excited to get started! Thanks again...Peace, John.
Where are you teaching? I allow teachers to sit through my 4-day FET class for free. If you can arrange that you're welcome to attend. I'll help you any way I can. Just remember that if you completely understand both Ohm's Law and Kirchoff's Law (voltage drops have to add up to source V) then everything will conform to them. Speakers are great for teaching motors, magnetism, resistance and generators. Don't be afraid to be wrong. That's way too much pressure to put on yourself.
This is awesome! What I would like to call an "electronic playground" there is so many possibilities with the board and the tape, overlapping takes it to the next level. I had to go try the solder trick.. so cool! The best way to learn is hands on, hands down. Thanks for the upload like and subscribe this guy knows his stuff.
Daniel thank you for teaching ohm's law. you need to explain your circuit with clear diagram that we see in text, also explain why it is parallel and why blow up the resister. you need more detail explaining. I like your concept in part one, but you need explain details....etc. thank you for teaching
Very informative I will make video like this also thanks
This a comment on Part One. I am posting it here because it won't let me post it there.
This is a really good common sense video about replacing E I R!!! Also I hate it when they teach current flows from Pos to Neg when in reality it is Neg to Pos. That's like teaching the obsolete (and wrong) idea the earth is flat when it isn't.
learned a lot within 14 minutes... thank you kind sir
Thanks Dan, this is very helpful. I'm definitely planning on getting your book and the leads.
One more question :) - can you recommend a decent meter that doesn't cost hundreds of dollars? I see such a wide array of prices and I don't want to get junk, but I have to wonder what the difference between a $34 harbor freight multimeter and the $300+ Fluke meter is...
FANTASTICO MAESTRO ......ES FACIL Y SENCILLO..EXELENTE
In the circuit without the 500ohmm resistor, if you unscrewed the top bulb, the bottom bulb would remain unchanged in terms of brightness, and the current in the circuit would drop back down to 59, correct?
If you jumped the socket, what would happen? How much current would go through each path?
Another thing that I have trouble wrapping my head around is the idea that the circuit "knows" what's ahead of it "down the line" before it gets there. If you think of electricity as flowing like water from positive to negative, then understanding why putting a 500 ohm resistor *downstream* from the bulbs would cause the bulbs to not light is impossible.
Sir i have one question. sorry if it sounds stupid. During that bad ground demonstration..when you applied that resistor, the current was still flowing through that bulb. Fine because current chooses least resistance path flow.
But then. here it starts the confusion. When you disconnect the conductor foil across resistor..the bulbs stop blinking. Shouldn't the maximum current flow through bulb again and light it up because it has low resistance than the applied resistor?
I mean..i understand that the current has no choice but to go across resistor to complete the circuit. But then does it mean that a high resistive load tends to pull the current more across it?
But AGAIN because it is a resistor... it should actually limit the current and voltage to minimum and not suppose to maximise it?
shit....i must bang my head again to the wall.
Love your teaching style
This is really good! A lot cheaper and easier buying an expensive breadboard and stuff.
The circuit/circuits thing is a bit of semantics. But regardless you are technically right. In a way most circuit boards should probably be called a circuits board since there is nearly always many circuits on one board such as computer motherboards.
Hie Dan thanks for your clips i'll be attending my Heavy Duty Electrical and Electronics lessons in 2weeks at NAIT.
Great teaching Dan 👍🏻
Lovely approach. ..I like it
Serendipity moment discovering solder becoming usefull as an experimental fuse. It's a worthwhile tip i can take away from this video. Good one!
Educational genius! Thank you so much.
Thanks Daniel! Great teaching! Can you tell me what type of battery source you were using for this instructional project. Is it a 12v DC car battery or AC, size etc. Thanks again, Mike CA.
I have a couple of sources, but what's easiest for me is a small, 12V alarm battery from Radio Shack, using a very cheap trickle charger from Harbor Freight. You can solder connections to the battery that are convenient for you and it isn't very bulky. However, one system I haven't really had time to promote is a variable voltage charger for a laptop - usually a replacement charger. In a classroom environment you can use one voltage for calculations for the Ohm's Law stuff, then have the students recalculate for a different voltage -- then all you do is change the voltage and see if they got it right. My experience is that it only takes about 2 days of this before almost all of them figure it out.
So is it now "circuit-board" or "circuits-board" like in, as you said, "parallel circuits".
I guess, most of the times there will be parallel circuits on that board.
Illuminator I suppose both work, but the basic unit is a single circuit. Parallel circuit"s" are a matter of connection. Circuits don't have to be parallel.
Daniel Sullivan So, if I have to hold a speech at the UN next week, mainly addressing a delegation of NASA engineers, shall I say "circuit-board" or "circuits-board"? I don't want to make a fool of myself.
Actually, the engineers would be texting each other about the cute girl at the entrance they'd never have the courage to talk to, not be listening to you, but, you asked a question I hadn't thought of. It's really a grammar question - not electrical. I'd have to say that both work - but I can't think of non-electrical example. Well, maybe, "dirty clothes basket" is plural, because we assume more than one dirty towel. "Spark plug tray" is singular, but there is usually more than one spark plug. I think we'll have to keep thinking about it...
What size battery are you using? Are you just connecting to test leads?
My grandmother used to get kits to let me build circuits, she could’ve saved so much money. This is great, but I’m still sticking with fuses lol
Go show your nearest trade school teacher
Amp & drop voltage,I wanna learn this things.I'm trying ti understand, miliamps, voltage,I have those multimeter, but different. Thanks for the video.
There is nothing on your website?
My leads and book and a 1-hr DVD is included in the TMX589 Tech Meter. Go to my channel and look for that video. With everything included it's less than $300. I think you can find it on Amazon. Ask for the TMX...
This is great Thank you.
this is cool as hell, you can take a schematic and turn it into an actual circuit.
Yup. That's what makes it real. The schematic and the machine match.
This was great thank you buddy
Amazing job. This makes it the 4th video of yours that I've watched. But if you add the total number of views, it is approximately a dozen. Your videos are helping me tremendously even though I am not an automotive tech. Keep up the great work and I will keep watching. By the way, It took one video to get me to subscribe and now its time to buy your book.
Dan I love your videos. This one has me confused though. Specifically, when you attach that second light bulb, why does the amperage double? Aren't you doubling the resistance (if it's in series)? If the resistance is applied in parallel then isn't the total resistance the same as with one bulb?
Either way I can't figure out why the amperage doubles!
I realize your question is 7 yrs old and you no doubt figured out the answer many years ago. So this is for others. Dan has described resistance in terms of a hole in a bucket. The smaller the hole, the greater the resistance, the smaller the rate of water (amperage) leaking out. If you add another hole (another resister / load), the rate of leakage increases.
Thanks for sharing, Sir.
Glad it helped. I'm trying to create an at-home training system using this method, but life is moving at light speed and it's hard to fit it all in while teaching to pay the bills. I hope your nephew keeps at it, because electrical knowledge makes a person highly valuable. Check online for my book - Fundamental Electrical Troubleshooting - it's not much money and should be very helpful to him. He can contact me if he has questions. My contact is on my website. Cheers.
One Question.. What does I actually mean? and why is it that the letter I represents Current? It makes it more confusing to remember and relate. It clashes with my brains logic.
+R Valasini From what I remember from basic electricity (could be wrong), R = resistance, a.k.a. Ohms, E = electromotive force, a.k.a Volts, and I = inductance, a.k.a Current.
André-Marie Ampère, after whom the Amp is named, was French and the french term for current is "intensité du courant" which translates to "current intensity". So he used I in his equations and other languages followed that convention.
Brilliant!!!
I have used one real fine wire as a fuse and also to check grounded circuit I would use the fine for a power supply.
You must hear this a lot but I wish you had been my tutor at college!
very good ideas!!
6:20 to 9:05
So you said at 6:20 it's a parallel circuits yet at 9:05 all you have done it replace the ground with a resistor to simulate a bad ground but you claim it's not a series circuit?
It has stayed the same in both though. The current comes though both lights which are arranged in a parallel way. Nothing has changed.
No - you're right. A high resistance fault IS series with the load. I don't think I said that it wasn't - if I did I made a mistake. Normal circuits only have one load, and two circuits in parallel are parallel circuitS. My assertion is that the term parallel circuit is wrong - and also confusing to someone who is working on a 400 ton truck. You're mistaken to think it's semantic - there's a big difference between tsunami and tsunamiS...
i could read a book for a year and not learn what i did by watching for 13 minutes
Great video, but it always amuses me when people say sodder instead of solder.
Cost of fuses? lol. Don't think so. Fuses are only bits of metal wire anyway but they are specific for a certain amount of amps. I wouldn't trust a piece of solder. Plus you would have to add multiple bits of solder to get the required allowance for amps. Plus being solder even at lower amps it would slowly go soft and pull apart. Where as the metal in a fuse is designed to stay strong all up until a certain point and then suddenly burn out.
Lord of the belts: The return of the KING
appliance.academy
Test
lol
10:45 Terrible!
everything else is great and educational
What does your comment mean?
that was a dumb question...never mind!
lmol