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Dropping resistor for LEDs

To use the calculator you need to enter the parameters of a single LED (its voltage and current), the voltage of power supply, number of LEDs and to choose LEDs' connection (serial or parallel). The calculator will compute value of a dropping resistor needed in the ciruit and its minimal power.

Single LED parameters:

U and I :


Uled :

Iled :

Supply voltage U:
V


Number of LEDs:

LEDs' connection:


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[ekalk]© Sławek Wernikowski, 2012-2016. Set of useful interactive calculators for electronics constructors and hams.

All suggestions and comments are always welcome.

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[[1.11 2017-01-28]]