If we do not separate Positive and Negative flow, what is the flow from a 3.3V connection?
A Little more background on why I ask this question and my confusion follows
I have been reading simple circuit design tutorials online, most of these include a battery with two terminals, one positive and one negative, which we connect cables to and eventually complete a circuit.
However as I began to progress, I noticed certain circuits began to have a 3.3V connection - One example would be a GPIO pin(Pin #1) on a Raspberry Pi. If I was to make use of this pin, would this be a Positive or Negative terminal? Perhaps it doesnt matter? or perhaps it is neither?