Wow. AWESOME VID! I completely just skipped over all this electronics when going through LED projects working with the Arduino. Seriously, thanks for this!

Great video, however I would have liked you to explain that the formula is over amps not Milla amps. and you end up with a decimal number that you need to multiply by 1000.

Question here :) So when you've got a LED and a resistor in series it doesn't matter how big the resistor is, the LED will have let's say 3,2V on it (depending on the datasheet) but the current would be really small if you would to connect a very big resistor. So the LED woudn't light up (at least not enough). Am I getting it right? I thought that if you connect a resistor in series to a LED the voltage splits up in between them. And if the R would be too hight the LED wouldn't pass the threshhold for the forward voltage needed for it to even light up. Thanks for your time...

Umm..i kindda get confused in the way u use the resistor... What i used to do is, i put the resistor first, then goes the led; so the resistor adjusts the voltage and led will get what it need as soon as the current meets the led. But how can resistor work if u put it after the led? The current already gose through the led! what i think the resistor is only gonna be able to play with the current that is left...which have nothing to do with the led.... I've seen many people do this..and i've tried myself, which worked...but i don't really understand how it does the job Could u please explain?

I have previously driven an LED succesfully with a 5 volts source and no resistor, throughout the LED's entire brightness levels, by the use of a PWM signal. It did work. However, I was told by everybody not to do that and I would eventually burn my LED down. Why?

what about voltage dividers?

Brilliant