# Resistor overheating

I have problem with the model of given power limiter (below are the images). Problem is in the red rounded resistor on the last image - that resistor overheats for some reason (I've put 3 ohm one instead of 2.2 ohm).

What should I do?

• Please don't ever do that again: posting 3.5 Mpixel images, and zipped as well! Scale them first, then upload (unzipped!) to an image server and notify us. We'll insert the images in the question. But not the way they are now. – stevenvh Jun 22 '12 at 15:26
• @stevenvh, uploading higher quality is okay, the images should re-scale automatically with even mildly decent browser. If someones browser is not supported they need to take that to meta not demand smaller images from users. On the note of zipping, I would have left that to the user to correct, that can hide viruses and such. – Kortuk Jun 22 '12 at 16:23
• @Kortuk - I have a fast Internet connection, and I have no complaints about the SE servers either, but sometimes I can tell it's a way too large image as I see it being built up on my screen. Most of the time it's not needed. As a matter of fact I found the third image here (I removed the second) easier to read when scaled down to 40 %, that's 84 % less pixels. The second was the 3.5 Mpixel, and contained no useful information. – stevenvh Jun 22 '12 at 16:52
• @stevenvh, I realize your points, my issue is primarily how aggressive people can be about things as simple as higher resolution pictures. I was mostly responding to the "please dont ever do that again" part. The zip is an issue, but low rep users cannot post pictures themselves and he probably thought it helpful. I would really prefer every user posted too high of resolution images then too low. – Kortuk Jun 22 '12 at 17:41

$\mathrm{P = 10\% \times I^2 R = 0.1 \times 20^2 \times 3 \text{ W} = 120 \text{ W } !! }$