I just bought some lasers and resistors from Amazon and I am a bit confused. First of all the seller says the resistors are 200 ohm. I am a bit confused because I have only seen resistors with number (23) with (23k) by it.
Can a 200 ohm resistors reduce a 9 v to 5 v so I can power the laser? Is this safe to do without having anything blowing up?
Picture analysis of laser