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Legrones

Copper - Posts: 75

Joined: April 17, 2003

Location: United States

Posted: April 05, 2004 at 10:27 AM / IP Logged

what size resistor do u use on a led with a 12 volt car source ?

Dale / Cory

markcars

Silver - Posts: 662

Joined: December 11, 2002

Location: New York, United States

Posted: April 05, 2004 at 2:18 PM / IP Logged

Here's one of the basic electricity formulae that helps me always.

V = I X R

Voltage = Amps times Ohms(Resistance)

9v = LED's amperage * R

Get the amperage of your LED from its specs and put the values in the formula above.

Also I assumed your LED runs on 3v, so I used 12-3 to get 9v.

Do the math for R, you'll get the value or your resistor.

Just make sure to convert the Amperage of the LED into Amps from milliamps, because they usually are described in milliamps.

Hope this helps.

Mark

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