How do resistors react in an LED-Array?
I've been reading myself through a lot of articles on websites about how resistors and LED's work,
but what I still don't understand is why, when calculating the required resistors for an LED-Array, this website ( http://led.linear1.org/led.wiz ) takes maximum 4 LED's for each resistor at 9V and a diode forward voltage of 2.0 - is it to prevent it become unstable or something like that? And frankly, I think that I miss understand resistors, although I've read a lot of articles about it.
So, what I think resistors do is this:
Since resistors are used in a simple 1-LED-circuits that has more voltage than the diode forward voltage, it simply lowers the voltage to the desired forward voltage ( 2.0 for a Red-LED as far as I remember ) - so my point is, when it always is lowered, why would you need more resistors when the voltage is lowered from the first LED on? Perhaps I am very bad at explaining my logical problem here, but I hope that someone actually understands something out of this mess. xS