LED Resistor Calculation

How do you select the right size resistor for an LED? This video will guide you through the calculation to select the proper current-limiting resistor for an LED, given the LED's forward voltage drop, desired current, and the voltage of your power supply. It also covers more complicated scenarios like combining multiple LEDs of different colors in series or parallel, and how to make sure you don't exceed the power rating of your resistors.

Have a question? Ask in the comments and I'll do my best to get back to you.

[MrRofl]

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

[UstedTubo]

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!

[theintelarif]

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

[deleted]

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!

[kabandajamir]

The world's best teacher thanks sir

[dfuzesavetf]

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

[jimthigpen]

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 !

[RetroHoo]

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!

[anthonychampagne]

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

[AdaManfaat]

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

[juharautiainen]

It was very good to understand that when putting LEDs in series, you don't multiply currents each LED requires.

[KennethSorling]

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.

[christopherhydes]

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

[SeeKay]

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

[PrayagSanjay]

Most compehrnsive video on resistor value. Thanks.

[garymucher]

I realize this is an older video. But no need to look up anything or to find the forward voltage drop to any LED. Merely take the supply voltage and divide by ~20ma or less and WALA, you have the resistor value. No need to look up anything, and too many times you have no idea what type LED you have. So merely pick your resistor for 20ma or less and it will work every time... JMHO!

[jeanpierreragequit]

A very clear explanation for my modelism lights. Thank u so much.

[mytzusky]

what a gold mine this video is, thank you.

[freebeardgaming]

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

[AlejandroPerez-vfjv]

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!