What Is A Potential Divider How Does It Work : Learn Electronics Beginners Part 5
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- Опубликовано: 9 сен 2024
- The 5th in a series of videos for anyone who wants to learn Electronics from the beginning.
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Thank you
Richard
With Richard , wer are not learning just electronics , we are also having fun . so thank you verry much sir , may god bless you 😇
I paid for 2 courses on electronics at 800 euro each. I learned a lot but by the end I still didn't understand voltage dividers or how they worked. You have explained it to me in 30mins. I really think you should take your videos and create a udemy course. Start with safety, then go through basics (as you are here) and finally show some troubleshooting repairs. It would be a winner. Thank you for this lesson. Have a drink or 2 on me.
Thank you very much
100% laughed as I just said this to my Wife. I have been trying to work this out for over 10 years and found out how to get it working. This is the FIRST time i know WHY and HOW I got it working. and then I read this comment and thought yup.
Richard i have watched many videos in my learning process and i find yours to be excellent. i'm not joking they are very good. i appreciate the fact you take the time to put them together. Thank you and stay safe in todays world. 😇
The potentiometer burnt up, that’s WATT happened. 😂 Thanks for the demonstration!
Hi Richard, yet another very well pesented video with content suitable for beginners learning electronics. Suggest you simply ignore comments from those who have failed to understand this series is intended for "beginners". 👍
Looking forward to the next lesson.
Hi, Sorry to be pedantic but, at 11:20 you say the voltage is one tenth of the input voltage, but with resistors of 47k and 470k, it should be an eleventh.
10 x 47/(470+47) = 0.909 volts (which is what you actually measured, the resistors have a closer tolerance than you thought!)
But a very good explanation video none the less!
Not really pedantic, you are quite correct 🙂
What an incredible teacher Richard is. Not just this video but everything. Absolutely brilliant, effortless and a complete natural. I wish more of my school teachers were like him 👍❤️
Querido Richard, sou um Brasileiro autodidata, militar da força aérea, musico da Banda, e nas horas vagas, todas as que não estou no quartel, kkk me dedico a aprender eletrônica. Amo amplificadores e na minha humilde oficina, desmonto muita sucata, reaproveito componentes e monto meus projetos, muito da internet. Meus estudos ficaram mais sérios há pouco mais de 1 ano, pois antes, tinha algum conhecimento mas não tinha o gosto necessário pra dedicar-me. Há pouco tempo tive a mesma experiencia contigo. Tentei acender uma lampada de carro, de 12 volts ...usar um potenciometro etc...logo senti cheiro de ampére queimado no potenciometro. Fiz calculos, considerei a tensão, corrente e até a potencia da pequena lampada, mas não entendi porque queimou. Sua explicação sobre a potencia e sobre seu efeito inevitavel, na carga associada em paralelo ao divisor de tensão, merece um oscar da generosidade e empatia com nós novatos. Estou aprendendo bastante por aqui. Forte abraço e sucesso!
This is a excellent series
Scrap yards and waste land were the very places I started to understand the world of electronics.
Kids dont get to play in such places anymore, I dint know if thats a good thing or not :)
Potentiometer power ratings are based on the the power being dissipated over the entire track length. You aren't entitled to use that rating when you use the pot as a rheostat. In that case you must determine the current rating or simply use the total power rating times the fraction of the pot track that is conducting.
P = I²R or I² = P/R or I = square root of (P/R)
e.g. a 1k pot rated at 1/4 W is good for a current of 15.8 mA.
If the current is flowing through only 20% of the track the maximum power that should be dissipated is 0.2 x 0.25 W = 50 mW
Confirming using current: 15.8 mA through 200 ohms = 50 mW
There may be situations where the wiper current shouldn't be as high as the calculated current handling based on power, so checking the specs is prudent. Usually there won't be an issue but it is possible.
Bourns has published some good stuff on potentiometers. One is titled _The Best of the Trimmer Primers._
Bourns trimpots are widely counterfeited though it is obvious with many.
Why are you watching a basic electronics learning video your knowledge is way beyond this level so why comment?
@@geoffedwards189 or laugh and denigrate people who ask 'stupid' questions. It's the internet. The whole of mankind is available to comment, for good or ill.
@@tonysheerness2427
If you will provide their contact information I can write to your handlers and try to impress upon them that it is stressful - nay, cruel! - to force you to read RUclips comments that stress your faculties.
In the mean time:
• I will have a box of tissues dispatched to your location.
• The whaaaambulance fleet is mostly down for seasonal maintenance and only the most urgent cases are being served. I cannot assure one will arrive for you.
• If you would be so kind, please provide direction to _The Commenter's Guide to the Lowest Common Denominator_ so that I can stay within the guidelines in future.
I think that's a great point. 20% wiper contact area seems a tad high though. I would of thought it's much closer to 10% 😄Anyway it's nice to get a deeper understanding on why such considerations are important sometimes. From a design point of view.
@d614gakadoug9 is simply pointing out that a potentiometer rated at 1/4W, for example, won't always be able to handle that power & has given a valid reason why. It's an extra piece of info. Why the hostilities? It seems like some would rather live in ignorance than hear the facts. 🤷♂
31:45😳😳😳😱😱
Fire 😳😳😳😳😳😳
Richard what did you do ??
The poti is now in the poti heaven 😢
Great explanation and demo Richard. It is always good to go over the basics no matter how much we have learned. All electronics is the basics in progressively more complex configurations, so going over the basics (Is it plugged in? Is it turned on?) fixes quite a few problems quickly. The presentations you are doing will go a long way toward helping people that are just beginning, but will also cover some things that were not learned from being self-taught. The fundamentals need repetition.
Yes a blast from my past doing things like this. As kids we would take transformers from old radios we found and make electric shock machines. We'd all hold hands and someone would be in charge of quickly connecting/disconnecting the battery. :)
What a great channel.
I really wish electronics was taught like this back when i was at school.
It was all maths and made zero sense. It wasnt until i left and did an apprenticeship that i picked it up much better. I need a real world reference to understand better.
Awesome demo! and my first power supply was also a blue Scalextric transformer and it came with two rheostats...cheers.
I am very much a beginner, but I thought I already understood potential dividers. HOWEVER, your story about burning out the potentiometer made me realise that there was something missing in my understanding. So I put all the voltage and resistance values in a spreadsheet with the formulae, and sure enough … they don’t work!
After a bit of googling I realise that what I was missing was: “Voltage dividers should only be used to provide a reference voltage to a high-impedance load”. In other words, you can’t use them to power a bulb for example, only something like the gate on a transistor … but I guess you’ll come onto that in due course!
BTW, entirely down to learning from your videos, I’ve fixed my first device (replacing a resistor in a battery charger … £70 saved), and waiting for parts for the next (triacs in a heated blanket).
Can’t thank you enough for your “how to diagnose” videos.
Awesome. I learnt something that I'd not considered before. Thanks ☺
Good explanation Richard.
Amazing videos, learn so much! Thank you for teaching us!
Wow , what a trip down memory lane for me ..scrap electronics..no meter .. burning smells 😁
Just like it was yeah 🤪
RLC will be fascinating. I can not wait :)
Also looking forward to this. Maybe cover some rf stuff as well?
1:53 - That’s an easy way to think about it; but, technically the third band color in this value scheme indicates the order of magnitude of the multiplier (I.e., brown is one so the multiplier is 10). In a five band color scheme the forth band would indicate the power of ten multiplier.
Great video i love this kind of stuff
Great video thank you a lot
Daisy chain: when your mum strings Christmas lights all over the house and property with only one end plugged into an outlet.
nice one
How come the variable resistor had such a small voltage drop up until it immediately jumped up to 6 volts? Why didn't it slowly increase the voltage?
now with pots as we could see on the live stream they can't handle lots of power so to handle more power then you need a transistor or chip to control the load right?
Love your channel, how can I get a hold of you. Have a potential tutorial or just a POC for your create a digital circuit of basic analog concepts, aka Digital capacitance leakage tester.
You can email electronicanaria@outlook.com
Thank you from Sydney Australia.
Q1. Is there a symbol difference for a resistor and variable resistor (per tensiometer)?
Can you recommend a diode color band wall chart?
🌏🇭🇲
1. The symbol for a potentiometer (pot) shows an arrow across the body on european symbols or at the side on zig-zag symbols (usually). There are normally 3 terminal shown in some guise or other.
2. If you use your favourite web browser to search, you will find many colour charts. Pick your favourite. 😁
I burned quite a few potentiometers in my electronics journey.
Voltage dividers are all about ratios
Where is the number 6 video, I am a bit lost
I just call them pot or pots as that will always be the same and peeps know what i meant by it lol
Hobbit hands 😂😂