gregorygarver.com Forum Index gregorygarver.com
San Francisco Real Estate Forum
 
 FAQFAQ   SearchSearch   MemberlistMemberlist   UsergroupsUsergroups   RegisterRegister 
 ProfileProfile   Log in to check your private messagesLog in to check your private messages   Log inLog in 

LED vdc, mA, and resistor help?!?!?!?

 
Post new topic   Reply to topic    gregorygarver.com Forum Index -> I Want Leads
Author Message
MRMOM



Joined: 11 Apr 2007
Posts: 4
PostPosted: Thu Jul 15, 2004 12:43 am    Post subject: LED vdc, mA, and resistor help?!?!?!? Reply with quote
If you have an LED light that operates on 3Vdc at 55 mA, and from your own knowledge you know that it will burn out if you connect it to the 13.8 Vdc electrical system in a car, then what kind of resistor do you need to reduce it without it blowing up (( in Ohms ))
Back to top
Richard_Guttman



Joined: 27 Sep 2005
Posts: 3
PostPosted: Wed Aug 18, 2004 4:04 am    Post subject: LED vdc, mA, and resistor help?!?!?!? Reply with quote
You need to drop (13.8-3) volts drawing 55 ma,so R=E/I = 10.8/.055 = 196 ohms (200 ohms)
Back to top
Display posts from previous:   
Post new topic   Reply to topic    gregorygarver.com Forum Index -> I Want Leads All times are GMT
Page 1 of 1

 


Powered by phpBB © 2001, 2005 phpBB Group