lets say if i take 20mA 2V LED. If i apply ohms law here i will get 100ohm resistance in the LED. If i drow two circuits that using LED and other one with resistors (100ohm) the voltage and current overall of the circuit should be similar between the two circuits. Because
2V / 20mA = 100ohm (LED resistance)
Why is that voltage and current of the point are different between these circuits.