LED question Answered
if I have a 3.6 volt battery should I use a 180 ohm resistor to get 20 mA to a 3.6 volt LED? I got that answer from 3.6 = (180)(0.02)
I'm asking this because online LED calculators disagree with me and say to use no resistor. also the battery might output 4.5 volts when extremeley fully charged, so I want the LED to have protection of not blowing out.