I got a quite simple question which i am not able to answer because i dont have nothing to measure Volt and Ampere in my circuit.
I have seen different simple circuits with LEDs and Resistors. Sometimes the Resistor gets placed in front of the LED close to the plus and sometimes it gets placed behind the LED. I am not talking about a Pull Down Resistor. My concern is a normal “pre-resistor”. I thought i have to place it in front, “pre”, to get the right current for a LED oder what piece i ever use. But i also see this “post” placement and i am worried why this is working and how this is working?
I thought the resistor has to “split” the current in fornt of the LED and not behind it.
So now my questions:
Does it matter, if i place the pre-resistor pre or post?
If yes, why?
I am gonna add two pictures explaining the difference.
In picture 2, i guess the 4 resistors are PULL DOWN? Right?
Nevertheless whats in the pictures, does it generally matter if the resistor is “pre” or “post”?
Thx for help,