series LEDs + ?Resistor

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jappee

Member - Posts: 1

Joined: April 27, 2005

Location: United States

Posted: April 27, 2005 at 9:32 PM / IP Logged

Hi all,

I hope you can help with a quick ,yet almost stupid question. If I have 12 LEDs in series with a 460 ohm resistor the voltage requiRED / expected is...???? And if I was to use a 110v source, the required resistor value is..???

Any help appreciated, It's just a little confusing to figure the resistance/voltage drop across all of the LEDs vs. just one. There are actually five parallel banks of 12 LEDs in series. These form RENAULT through holes in plastic sheet. Also I know that 12v doesn't work and that 110v lets you enjoy them for about 1-2 seconds, then...

TIA

jappee

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ff-mike

Copper - Posts: 199

Joined: November 15, 2004

Location: United States

Posted: May 24, 2005 at 12:50 PM / IP Logged

You need only be concerned with voltage drop, as in theory there is no set resistance. 12 LEDs will drop about 8.5 volts, and the source is 12V. That leaves 3.5 volts. Our current should be set at 25 mA, which gives a resistance of 140 ohms. The 480 is limiting you to about 8mA For 110v, you would want 4000 ohms, and LEDs that have a PIV of 110v

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Scuba_04

Member - Posts: 19

Joined: June 12, 2005

Location: United States

Posted: June 12, 2005 at 12:46 AM / IP Logged

OHM's Law!!!!!!!!!!!!!!!!!!

Steve

Music Mart

Installer

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series LEDs + ?Resistor

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