Im new to this forum and quite new to electronics. Hope Im writing this post in correct section.
I know some basics like Ohms law etc. Im going through the 15 projects from arduino UNO book. Before I plug things into Arduino Im testing my circuits with TinkerCad.
Lets say I have a serial circuit powered by 5V pin (Arduino UNO). In the first project the 220 ohms resistor is chosen (would like to see calculation of why is it 220). Ohms law says that current in the circuit will equal to around 20mA. So far so good. According to the book thats around maximum that LED can handle. I understand that values are taken from some kind of LEDs datasheet (or whatever it is called :)). When I construct above circuit with TinkedCad I get a 2.08V voltage drop on the LED. What I dont understand is how TinkedCad knows exactly what is a voltage drop and why while increasing resistance a voltage drop on the LED decreases?
Additionally current in above circuit with LED is 13.5mA according to TinckerCad... Does a LED decreases the current in the circuit somehow?
Appreciate any attempt of explaining it to me :) Cheers