Please help me understand this.
The electrons in a complete direct current electrical circuit flow from negative to positive, same as cloud to ground lightning. Voltage is the (push/force) that is moving the electrons in the circuit. (Current/Amps) is the flow, or amount of electrons flowing. The light bulb is a dam in the stream, or something that is blocking the electron flow. If you have two direct current voltage sources, (always maintaining a relatively identical voltage), (in this circuit, 12 volts), and they are parallel wired to serve one resistance, (a light bulb), it makes relatively no difference if one, or the other, or both of the power sources are powering the light bulb circuit?
Do I understand what was being explained earlier?
The conductors (wires), and the physical connections in the circuit also create resistance to electron flow in the circuit. In general, a larger conductor (wire) in this circuit will offer less resistance to electron flow than a smaller conductor. (Dirty connections also offer more resistance to electron flow.)
Taking into consideration that 12 volts isn't a lot of push, and that current is proportional to voltage, and inversely proportional to resistance, then. In a parallel wired voltage supply circuit, serving multiple loads, if you have one load (downstream from the power supplies) that requires a high current, with all other loads in the circuit having a lower current demand, and all the loads are served by the same size wire with identical current carrying capacity, you'll create a circuit imbalance, and some negative results?
What happens if I size the wires throughout the downstream portion of the circuit appropriate to the current demand for each loads portion of the circuit? Identical parallel wired power supplies, (each capable of handling the total circuit load), still shouldn't be a problem, (no matter which combination of on and off, or both, that is used to power the circuit)?