Question about the LED tutorial here
Moderators: adafruit_support_bill, adafruit

Question about the LED tutorial here

by tbrantb on Fri Mar 22, 2013 9:45 pm

I have a question about the last couple questions in the Adjusting brightness section of the "All about LEDs" tutorial

"How much current is flowing through the LED if when the pot is turned down? The forward voltage of the LEDs are 2.2V."

The tuturial says the answer is:
2.2V / 100 ohm = 22 milliamps.

Shouldn't the answer be:
(5V - 2.2V) / 100 ohm = 28 milliamps ???
Posts: 1
Joined: Thu Mar 14, 2013 6:35 pm

Re: Question about the LED tutorial here

by adafruit_support_mike on Sat Mar 23, 2013 12:47 am

Yep.. good catch.

In Tyler's defense, I make that same mistake All. The. Time. ;-)
When you void a product warranty, you give up your right to sue the manufacturer if something goes wrong and accept full responsibility for whatever happens next. And then you truly own the product.

Posts: 15905
Joined: Thu Feb 11, 2010 2:51 pm