Resisty

This plugin creates a resistor color code captcha on comment forms

Author:Daigo Kawasaki (profile at wordpress.org)
WordPress version required:2.0.2
WordPress version tested:2.1
Plugin version:1.5
Added to WordPress repository:13-04-2010
Last updated:21-04-2010
Warning! This plugin has not 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.
Rating, %:0
Rated by:0
Plugin URI:http://www.adafruit.com
Total downloads:1 555
Active installs:10+
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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).