If is the 20mA being discussed, the current from the Arduino pin thru the resistor and LED.
Reverse Voltage is how much voltage can be applied to the Cathode with the Anode at a lower voltage before the diode/LED will conduct current backwards.
If is the 20mA being discussed, the current from the Arduino pin thru the resistor and LED.
Reverse Voltage is how much voltage can be applied to the Cathode with the Anode at a lower voltage before the diode/LED will conduct current backwards.