1
\$\begingroup\$

I pulled these from a computer power supply. At first I thought they were resistors, but they are around 5-10 Ω. I'm guessing they are inductors, but I can't find a chart which matches this color pattern.

If you know what they are, can you enlighten me?

enter image description here

I decided to break one open. Ceramic core (I couldn't cut it with wire snippers) but I chipped off the outer layer... Super low value resistor?

enter image description here

I believe @hacktastical has the description right. I did a search using some of his terms and found this:

https://eepower.com/resistor-guide/resistor-materials/wirewound-resistor/#

\$\endgroup\$
12
  • 1
    \$\begingroup\$ So why exactly are you pulling out components that you don't even know what they do? Are you trying to repair something? \$\endgroup\$
    – Lundin
    Feb 14, 2023 at 12:42
  • 1
    \$\begingroup\$ Anyway most do definitely look like resistors and if there's gold/silver "lining" (pun intended) on them then they will have low values. See for example cdn.sparkfun.com/assets/learn_tutorials/6/4/Resistors.png. Some might be thermistors I suppose, which aren't unlikely to be found in a power supply. (And yes, color coding of TH components is possible one of the dumbest inventions ever made by mankind.) \$\endgroup\$
    – Lundin
    Feb 14, 2023 at 12:49
  • 1
    \$\begingroup\$ Years ago while reverse engineering an old phone/answering machine for fun (playing with equipment in the lab) I noticed similar things. The designers had used wire-wound resistors for their small inductances... \$\endgroup\$
    – Jon Custer
    Feb 14, 2023 at 13:46
  • 2
    \$\begingroup\$ That's why I'm asking what they are. Some things are learning experiences. \$\endgroup\$
    – LarryBud
    Feb 14, 2023 at 15:34
  • 1
    \$\begingroup\$ break one open . \$\endgroup\$
    – jsotola
    Feb 14, 2023 at 15:41

1 Answer 1

1
\$\begingroup\$

They are called wire resistors and they have low ohmic value. For example, in the photo, the yellow resistor has a value of 2.2 ohms (third band is golden). If third band were silver, it would have a value of 0.22 ohms.

\$\endgroup\$

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.