[VTenigma]

You mean current only flows one direction through a diode? I think I learned that in 5th grade.

[Noumenon]

You're not going to get an amateur radio license without knowing basic stuff like that. And wasn't it Robert Heinlein who said,

"The three legged stool of understanding is composed of languages, math and history. Equipped with these, you can learn anything you want to learn. Without any one of them, you're an ignorant peasant with dung on your boots."