This plugin hasn’t been updated in over 2 years. It may no longer be maintained or supported and may have compatibility issues when used with more recent versions of WordPress.



This plugin will draw a random 5% or 10% resistor and four color band sliders beneath it. The commenter needs to match the colors on the sliders to the colors on the resistor.

Commenters don’t actually need to know how to read resistors.

Random resistors are generated from E12 and E24 decade values (so there’s never something like a 4.6K Ohm resistor).



We’ve made a few changes thanks to our many beta testers:

  • New reload image button
  • Image path name is now correct
  • Parses out single and double quotes and backslashed out correctly.
  • Colorblind friendly option now in beta.
  • 20% resistors now show up


Official Release!

Contributors & Developers

This is open source software. The following people have contributed to this plugin.


Browse the code