/diy/ - Do It Yourself

newfriend here, just getting started and semiconductors are cool shit
if i wanted to light pic related without killing it(under 20mA), i'd need the voltage across it to be between 3 and 3.6v right
also say i wanted exactly 15mA with a series resistor, but have a 5v source - i can treat it as a 200ohm resistor at 3.5v(3.5v/0.015A)
then calculate total resistance 333ohm(5v/0.015A), 200 of which is from the led, meaning i need a 133ohm resistor

did i fuck anything up