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Ona-Mission

03-04-2009 07:13 PM

Basic Electricity 101 question?

I need to use a single l.e.d. light on a 12v. power supply. As an example, If the light has a max rating of 3.6v how do I figure what resistor to use? I'm sure there must be a simple formula. Thanks for your help.

US1 Fountain

03-04-2009 07:18 PM

http://www.kpsec.freeuk.com/components/led.htm

http://www.llamma.com/xbox360/mods/H...20an%20LED.htm

http://ledcalc.com/

bowtie

03-04-2009 08:46 PM

V=i*r

PhantomChaos

03-04-2009 11:00 PM

Most LED's have a 1.6 to 2.5Vdrop by themselves.....but usually only handle 5ma to 50ma max. Sounds like there may be a resistor in there already? Do you have a Part Number or something?

KNOT-RIGHT

03-05-2009 08:57 AM

R = (12V - 3.6V) / 0.02A = 400 ohm resistor

Go with a 500 OHM 1/4 watt

Ona-Mission

03-06-2009 08:43 AM

Thanks for everyone's help.

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