This should be a simple one for you guys
I was looking at the first diagram on Chapter 1 here http://forum.allaboutcircuits.com/blog.php?b=378
And it has a source voltage of 9v and he wants to put a 2.5v led that has a current requirement of 20mA. Now I thought you had to use a voltage divider to get down to 2.5 volts (by putting 2 resistors in series), but he uses just one resistor.
How does it work? - i dont understand.
I was looking at the first diagram on Chapter 1 here http://forum.allaboutcircuits.com/blog.php?b=378
And it has a source voltage of 9v and he wants to put a 2.5v led that has a current requirement of 20mA. Now I thought you had to use a voltage divider to get down to 2.5 volts (by putting 2 resistors in series), but he uses just one resistor.
How does it work? - i dont understand.