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Formula For Figuring Resistor Value    
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John1397



Joined: 16 Aug 2007
Posts: 44
PostPosted: Thu Sep 10, 2009 7:50 pm    Post subject: Formula For Figuring Resistor Value Reply with quote
If you have two leds one 25ma at 3.3v and another at 10ma 3.3 volts what is the formula for figuring resistor value as amps X volts gives you around 132 ohms which can't be right?

John
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JTS1957



Joined: 21 Jan 2009
Posts: 2395
Location: Far, Far Away
PostPosted: Thu Sep 10, 2009 9:22 pm    Post subject: Reply with quote
Ohm's Law: V = IR or I = V/R or R = V/I

You don't state how they're wired... assuming in parallel with source each will need one.

25mA LED would be 132 ohms.
10mA LED would be 330 ohms.
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