Need help deciding which resistor I need

Thread Starter

Isaac22

Joined Jun 27, 2016
5
Hello I have a 5 volt power source and a standard 1.5 volt led(see pictures below). My question is which resistor do I need so I don't damage the led with too much voltage. I would apresheate any help.image.jpegimage.jpeg image.jpeg
 

dl324

Joined Mar 30, 2015
10,055
If you're using the LED as an indicator, 10mA is probably sufficient.

R = V/I = (5V-1.5V)/10mA = 3.5V/10mA = 350 ohms. The nearest standard 5% value is 360 ohms.
 
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