I have a source power with 2 V and 100mA. I have an LED that has a forward voltage of 2 V and a max current of 20mA.
Should I use a resistor to reduce the current? I see many formulas in the internet saying the the resistor value should be:
(Source Voltage - LED forwared voltage)/LED max current
This formula always worked fine for me, but now that I have a 2 V source power this formula tells me that the resistor should be 0 ohm. Of course this would damage my LED cause the 100mA provided by my source power is way above the 20mA current limit of the lED.