LED Calculator Web Page
Designed by Tom Leonik



Voltage across resistor
Required Resistor Wattage

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 


 

LED Calculator(Shows required Resistor at specified voltage and current)
LED brilliance is shown for effect only..... typically a current of 16ma is sufficently bright
 
Volts

 

 Resistor

 

  r

  Use Slider for desired Current
         100% = 20 ma

 

LED

 NOTE: LED voltage is set at 1.8 VDC.  This calculation also treats the LED as an ideal device ( having no internal resistance)