Finally found someone who knows his stuff and explain it in a very clear way. Thank you!

This is the first video (of MANY) that I've come across that actually shows how to find the voltage and current for an LED, or actually uses the terms one sees in the data sheets for that matter (forward voltage and forward current). All other videos explaining how to calculate the resistor just say, "...and this LED has a voltage drop of 2V." Thank you for explaining in a practical, applicable way!

Excellent teacher, i love the practical knowledge I used to do this in my GCSEs but never got the application part but you've shown exactly where it would be applied to real life. You are a W guy!

Thanks for explicating each of the cases comprehensively, sir. The succinctness of your tutorials is truly appreciable.

I had electronics in school roughty 25 years ago, so I was a little rusty... I've seen more than a couple of videos to refresh, but this one is by far the best. Thanks!

The world's best teacher thanks sir

You deserve a lot of subscribers. Great educative video!

Thank you for this informative video No joke dude I actually thought you would have thousands of subscribers u deserve it

you nailed it. nice presentation, nice knowledge, nice appearance. you deserve more views

Most compehrnsive video on resistor value. Thanks.

how can you only have 187 subs with such high quality vids

Absolutely awesome education video explaining about the LED's!! Thanks so much!!!

your video is going in my playlist . well explained !

Wow this was so helpful, thanks. The explanation was so clear without knots.

I've watched so many video's on LED lighting today that you might as well have been speaking Chinese . Brain overloaded . A great video for sue but I need it in slow motion . You talk faster that I can think ! I need a nap !

Nailed it. Thanks for going through every scenario

Nicely explained an demonstrated, doc. You’ve got me as a subscriber.

Thanks for your help. This is video gives a clear and concise explanation. well done!

Dude! Thank you, this was super helpful. I’ve always struggled with this math, and this broke it down a way I could really digest.

Thanks for this, very good examples for someone who is just learning about using leds and a breadboard!

Dr. Ben Finio, thank you for the video, you made things easy to understand. I will subscribe and watch more of your videos, they are awesome!

Excellent! You make it very easy to follow... thank you!

tbh, i was very pleased with the presentation its informative and well, easily understood. i wish they did this when i was in grade school. couldve made things so much different for my life today.

This is exactly what I needed to know. Thank you

Thank you! Answered my question and explained it well. Been too many years since my junior high electronics class I have forgotten everything.

That was as clear as it gets. Thanks!

Thank you. Clear explanation.

The best explanation! Very good presentation.

very well and clearly explained with practical. keep it up. love from INDIA

Phenomenal explanation, thank you!

Thank you for your work. Finally i get it.❤👍

Very well put together

Wowwww this is very to understand all my question are already answered upon watching this thank you Dr.!

I so needed this tutorial. Spot on buddy.. 👍

Thank you for this explanation.

Excellent video, thank you.

Brilliant explanation

Thank you verry clear explanation.

This was a great tutorial, but still way over my head. At 55 years of age, I feel I need to go back to school and re-learn the basics of electronics. I feel a real temptation to do so, though, so that's a good reflection on your video.

thanx for nice explanation

Thank you, this was so usefull and clear, please make many many more. Greatings from Argentina.

Nice video shot, thanks for sharing it with us, well done :)

wow amazing. you need more susbcribers. amazing explanations.

Thanks,You Are King 👑

Not sure why, but my dyslexia doesn't affect me while learning this from you. Thanks!

This is amazing

Very helpful video thanks it helped me understand my tech hw

It’s the conventional flow thing, and then calling it current. Call electrons like it is or confuse the watchers who probably understand electron flow theory. Good picture quality and explanation with rated resistors! Thanks for sharing.

Nice, Thanks.

Very nice video. In respect to LEDs themselves, read your datasheet and it should have relative luminosity at a specific current. That way if you're doing RGB stuff, you can figure out what current you want in order to make the relative brightness between each color the same.

Thank you so much for this information on the green led with a 100 ohm resistor would it make the led last longer instead of to much power to burn the led out

Very cool 🇧🇷😉👏👏👏👏👏 awesome video !

Thanks

thank you!

Nicely explained. The only thing I did not understand is how the breadboard parrallel connection with your multimeter plugged in at 6:42 works.

Good presentation! I'm little lost on resistor power handling...heat dissipation. Like when to use a 1/4 watt instead of a 1/8 watt (example). I had a project to use LED lights on a golf cart. Cart batteries were 8.43 vdc each. I had LEDs using 4.5 vdc. Not knowing current draw of LED....I started off with 100 ohm resistor...had 2.7 vdc to LED...was very dim illumination. Then tried 33 ohm (was 1/4 watt)...got 3.2 vdc to LED...was little brighter...then tried a 10 ohm (was a 10 watt)...got 3.9 vdc to LED....was much brighter. By seeing my results I figured to get the 4.5 vdc I would need a ~ 2 ohm resistor (to achieve optimal light illumination of LED...rated as 100 lumens output). I noticed I could not read actual drop down voltage out of my "circuit" until there was the LED load put on it. Had fun playing with it....not an "orthodox" way of designing...didn't have the current draw specs of the LED. Not sure if this is an acceptable way to do it. 😁 Just curious if my estimation of the 2 ohm resistor is correct. And would a 5 watt rating work?

Great video, thank you for making it. How do you figure this out when you don’t know the values of the LEDs you are using?

I have a car license plate bulb socket that requires a resistor to make an LED bulb work in the socket. If I use an axial resistor and connect one wire end to the left socket contact and the other wire end to the right socket contact and then insert the bulb into the socket is that a series connection? Also, if I calculate a 115 ohm, 1W resistor could I go with a higher power rated resistor like a 5W? I believe I read you can do that. In this case if you chose a 100 ohm resistor would that be close enough or should you be at or above the calculated resistance value? Thanks for your time!

Hi, thanks for the great explanation, I have a question for calculating the value of the resistance @ min 10:46 , why did you put 0.02 for the current when we have 2 LED? Isn't that supposed to be 0.04? or that's because we connected the LED in parallel?

Hello, very nice video. If you were able to supply an LED the exact same voltage that it requires, would your calculations come out to zero ohms, or no resistor needed? For all of your examples, the voltage provided was above the voltage required, so I understand needing a resistor in those scenarios. Thank you.

Can connect a 3v led with a resistor and a 12v led to the same 12v battery? Does the resistor limit the 12v as well?

What resistor could i use if i put together the red and green led on 9v battery?

Hi, What are the green wires on the circuit board between the LED's and the plus voltage?

Really great video. What’s the purpose of the 0-ohm resistors in your kit?

thanks! (:

Good inf

Very clear and comprehensive with different scenerios, thank you! I got few questions, in another video it said it is possible to measure forward voltage of an LED diode in multimeter diode mode. And it did work for my red and yellow leds, showing around 1.8 volts, but it doesnt seem to work for my blue or white LEDs,. Any idea what is the problem? Also is this method applicable for longer LED strips? Is it possible to figure out ideal current for a given LED too, without risking burning out the LED with trial and error? I'm quite a newbie, I'm sorry if these are dumb questions, but any help is much appreciated. Cheers.

I have a question 5mm fat led datasheet is missing... How do I find out

Really enjoyed this video! Question, if voltage is similar to 'pressure' would sending 5.2v through the first LED which is rated for 3.2V not blow it up in the series circuit?

Which LED colour uses least current?

Hi Ben . Lovely video explaining the maths and the valuable point about not making an error of adding up the forward ampage in a LED in series circuit. I have a question ,please. On resistors size my little project works out the power going thru my resistor is 0.029w , does it make any difference if i was to use a 0.125w power rated resistor , to say , using a 0.500w power rated resistor ? Hope you could help. Look forward to hearing from you . Regards Don Codman

Thank you for the video. What can one do if they don't have info about the voltage drop and current of the led

Nice video! The only thing I would have liked to know more about is the construction of the LED and which side to attach the resistor and which side of the LED to attach to + or - of the battery.

Ben Eater and and Bean Finio damn ❤️❤️

I try drop my reciver voltage from 6 volts to 5.5 volts. I thought it would be 1 or 2 ohm resistor but it took 1M resistor to do it. I am bit confuse why that is 🤔

Im just starting teaching myself. Your the man..

Thanks a lot for great explanation. However, one huge minus is using that marker - when you write on paper with it I got goosebumps (I hate that sound irl)

You taught me more about LED circuits than 4 years of college in India

Hey, Thanks for not replying. I was thinking of subscribing but you solved that question for me.

Howdy, Brother! What resistor should I use if I have a yellow 10mm LED Emitting Diode (1.8-2.2V) powered by two AA Batteries (on/off switch in the loop)? I'm not even sure if I asked the question properly 🤠. Thanks for any assistance.

This is a really good video, thanks for making it and posting it. It will be helpful for my project. My only criticism is that it would be more helpful if you included the units (mA, A, V, etc.) next to the numbers to help understand the formulas and calculations. Will be subscribing to this channel as its so helpful.

Or to put my question a different way: What is the difference between voltage drop and forward voltage?

Hi sir, just wondering if you can provide credible sources like websites or articles that I can use as reference for this experiment. Need it for the demo paper hehe. Thank you!

Great video! I have an LED string with non-removable bulbs and 1/2 of the string is dead. I have found the bad bulb and I want to cut it out of the circuit. I know that I have to replace the bulb with a resistor but, since I have no data on the string of lights, I don't know what value of resistor to use to phase out the dead LED. Suggestions?

What would you recommend for 12 LEDs and a single power source between 9v and 12v? All parallel with a resistor on each, or several LEDs in series and those series in parallel sets with a resistor for each set? Concern over how hot the resistor gets is unique due to the material near the LEDs being very sensitive. Thanks.

bookmarked :)

Thank you. What is the 0.6 or o.7 drop voltage that it is mentionned in many tutorials. Is it the minimum PD between anode and cathode needed by the current to cross the LED ? I am confused on this point. Thanks in advance 😀

Could you add a small capacitor between each diode for voltage stabilization

Yeah I have a question. I have a power supply (coin cell) of 3.7V I need to power 3 LED Filaments that are 3V at 50 - 100 milliamps. Do I need to add more power to run them? How money resistors would I need? And What resistor would I use? I don’t want to overheat anything? Just FYI I have a 6V power supply if I need it.

Hi Ben I have 90 LED 2v all individually switched obviously will each have their own resistor what is the lowest and highest power I can run these on and what calculation would I use pleas kind regards John

So if I want to run 8 3v multi colored flickering leds off a 12 volt power supply what size resistor would I use

Need help. I want a simple led and resistor and diode combination which will glow the led at exact 4.2V. My BMS does not have led indicator to show li-ion battery is fully charged.

Hi, if I have 3w or 5w led, can I consider the current is 0.8 amp and 1.38amp respectively, based on led forward voltage is 3.6v? Thanks,

Now that's a doubt that i had in my mind for so many years 🥲 and thanks for helping 😌✨

Could you not also run the different lights from different 'taps' of the battery pack.

Can you do a more complicated network? Gained a subscriber here.

why did you subtract 2v from the original 3v? is it because there is another load whose voltage drop is 2v (doesnt have to be an LED)?

It explane more but I still cann't put all together. What is current of the battery? Why is it not importent? What will be the difference if I use 5V 0.5A or 5V 0.9A (USB supplied power)

I have a 12V LED and a 24V power supply. Would a resistor protect my LED?

At 1:14 it's said that using extra batteries will waste power because it will be burned off by the resistor, but at 4:39 it's said that if you reduce the current from having a stronger resistor you can extend your battery life. These two statements seem like they're in opposition. Could someone please elaborate?