it scares me that someone writing that lists "http://www.basicsofelectricalengineering.com/" as his website.
Have you taken a look at the website? Mostly Ohm's law calculations, and only 9 followers are listed, so little harm is done.
I was amused by this definition of a diode:
The diode is a two terminal component which allows the flow of AC in one direction and stops it in another direction.