Originally Posted by Vick!

your calculation is somewhat right, but 22 ohms of resistance is so small that it can be ignored and we assume LEDs are working on 3v each.

No doubt these values vary depending on the type of LED and strength of 9v battery. A fully charged 9v battery have potential difference of up to 9.4 volts whereas a less charged can have 8.4 to 8.8

And to answer how it works, in the chain of 3 LEDs .. other two acts as simple resistor to the third. So, actually each LED get ~3v potential difference across its terminals.

I don't know if I got what you were really asking .. may be lol ..


Hey, have a look at this .. it might help http://www.theledlight.com/ledcircuits.html