This question might be a little more appropriate for the physics stack, but I'd like to test the water here first. I am just getting into electrical engineering, and as I go along, certain aspects grab my curiosity.
When you have a junction, like the letter "T" we could say that the top of the T is a serial bus wire or something, or just a wire carrying DC current. Then the base of the "T" is a connector that some peripheral can connect to, to use some current to power itself, however, it's not always plugged in.
So assuming nothing is plugged in to that wire at the moment, what exactly happens? Is the DC current somehow reflected back? Also this may come across as naive, but when a peripheral is plugged in, do the electrons from one wire actually physically move into the other conductive compound? Or does the electromagnetic energy from the end of the wire induce current into the attached conductor?
Thanks for feeding my curiosity. I've Googled endlessly for this kind of info but I always turn up empty-handed, maybe someone can point me to some good reading material!