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L.E.D. Information

Ohm's Law Circle

Resistor Color Code Chart

Current limiting resistor calculator for LED's

Single LED - Series LED's - Parallel LED's
Resistance = (Supply Voltage - LED Voltage) / amperage

Single LED
Supply Voltage
  VOLTS
Voltage Drop Across LED
  VOLTS
Desired LED Current
  MILLIAMPS



Calculated Limiting Resistor
  OHMS
Nearest higher rated 10% resistor
 
Calculated Resistor Wattage
  WATTS
Safe pick is a resistor with
power rating of
  WATTS


SuperBriteLEDs Website Calculator


Series LED's
Supply Voltage
  VOLTS
Voltage Drop Across LED
  VOLTS
Desired LED Current
  MILLIAMPS
How many leds connected
 



Calculated Limiting Resistor
  OHMS
Nearest higher rated 10% resistor
 
Calculated Resistor Wattage
  WATTS
Safe pick is a resistor with
power rating of
  WATTS


Parallel LED's
Supply Voltage
  VOLTS
Voltage Drop Across LED
  VOLTS
Desired LED Current
  MILLIAMPS
How many leds connected
 



Calculated Limiting Resistor
  OHMS
Nearest higher rated 10% resistor
 
Calculated Resistor Wattage
  WATTS
Safe pick is a resistor with
power rating of
  WATTS

Original LED checker script by Nannette Thacker at: http://www.shiningstar.net

Found at Quickar Electronics, Inc

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