I'm using a 9V battery with a 5v regulator as a power supply. What I can't grasp is why I place the regulator in the (+) lead of the battery. If electricity is electrons flowing, and the excess electrons come from the (-) terminal of the battery, why the heck is the regulator placed in the (+) lead instead of the (-)? Wouldn't putting it in the (-) regulate the electrons coming through?
To further add to my confusion, when watching a video about using a 9V as a small LED power supply, the guy connects the 470 ohm resistor on the (-) lead to protect the LED. Why is it that one person regulates the (+) lead, and another the (-)? I understand that there is probably some difference in function between the regulator and the resister (I'll look it up later, I swear), but the principle seems the same - manipulating the electricity sourced from the battery.
This leads into my other question about grounds and the negative lead. I'm going to be working with TTL chips on a breadboard:
14 pin => +5v
7 pin (labeled as ground) => (-)
So in this scenario, the (-) lead is being used as a ground? This seems to conform to the ground black wire used for car batteries and electric guitar pick ups - stuff I am a little more familiar with. But with my recently acquired knowledge, this leaves me scratching my head as to why the source of the electrons (the negative lead) isn't being connected to the 14 pin instead, which is essentially what I was rambling about in my first questions.
Please! Enlighten my poor wretched soul!