inline resistors w/ leds
Printed From: the12volt.com
Forum Name: Lights, Neon, LEDs, HIDs
Forum Discription: Under Car Lighting, Strobe Lights, Fog Lights, Headlights, HIDs, DRL, Tail Lights, Brake Lights, Dashboard Lights, WigWag, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=78600
Printed Date: May 17, 2024 at 4:38 PM
Topic: inline resistors w/ leds
Posted By: zzachattack2
Subject: inline resistors w/ leds
Date Posted: June 01, 2006 at 11:57 PM
Is there a maximum voltage that can be applied to LED's? I only ask because most inline resistors for LED circuits only act as current limiters, and still allow the 12 or 14.4 or whatever voltage to be applied across the LED (assuming they are not in series). Either there is something I'm missing, or my understanding of basic electric laws has become fuzzy.
Replies:
Posted By: doibuy
Date Posted: June 02, 2006 at 6:57 AM
most LEDs (for alarms) are 2 Volt not 12. If you try to connect them directly to 12 V they will "burn out" immediately. The resistor is limiting the voltage flow to 2 V instead of the common 12 - 14 V in a car electrical system
Posted By: zzachattack2
Date Posted: June 02, 2006 at 10:17 PM
Yes i know that, its because there is no resistance in the circuit since, diodes do not act as loads or carry a real resistance.
But nevermind, I figured it out. For calculating the resistor use (Vsrc - Vled)/Current of LED
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