danrogers
Member
Hi all, a real simple question here...
I have 3 LEDS in series powered from 12v, that I want to drive @ 50ma each. two different strings,
A - forward voltage of 2.3v x 3 = 6.9v (using a 110ohm resistor)
B - forward voltage of 3.7v x 3 = 11.1v (using a 18ohm resistor)
What is the power that will be dissipated over these resistors? I need to know what power rating to buy. I have tried a couple of online calculators but the results seem to vary somewhat!
Thanks![Big Grin :D :D](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
I have 3 LEDS in series powered from 12v, that I want to drive @ 50ma each. two different strings,
A - forward voltage of 2.3v x 3 = 6.9v (using a 110ohm resistor)
B - forward voltage of 3.7v x 3 = 11.1v (using a 18ohm resistor)
What is the power that will be dissipated over these resistors? I need to know what power rating to buy. I have tried a couple of online calculators but the results seem to vary somewhat!
Thanks