I must admit I'm rather ignorant of all things electric, so I got an Arduino with the intent of filling this gap in my education, and also learning more about the physics behind programming and do low-level stuff, but I've not found a proper theoretic introduction to exactly what's going on within the device. I can only find plug-things-like-this type tutorials.
So, for example, here is a breadboard diagram of the blinking LED tutorial (pdf)
It seems to me like the wire connected to the 5v pin is connected to the
+ pins of the breadboard... which are connected to nothing. There's nothing else on the
So isn't this an open circuit? What exactly is that
+ -- 5v connection doing?
That connection is not drawn in the schematic diagram.
Nor is it clear to me how pins are connected within the arduino itself.
I know this is a basic "google it" question, but probably due to the fact that I don't have the vocabulary to do so I've not been able to find a description of current flow in an Arduino.