Electrical wiring question

[Shakey]

Thank you Chris and Alex for your input.
I used the label of variable resistor as I couldn't think of a better way to describe the way in which it worked at 4am in the morning :P I do recognise that it is a gross oversimplification to label ESCs as such.

I don't claim to be an expert in electrics (my background is computer sciences) but it was my understanding that the voltage seen by each component in a circuit was the total voltage of the circuit as supplied by the batteries divided by the number of components in said circuit, least to the ESCs themselves. I can see how the motors running would potentially affect the amount of current each ESC receives, I suppose that would be the same for voltage as well but I don't see how that would lead to one of the ESCs overvolting.

I'm afraid that's an incorrect understanding. It's their resistance compared to each other that decides the voltage they see which is not constant with ESC's. When things are all the same resistance it can work as a rule of thumb.

To take it to the extreme one wheel free spinning while one at stall would result in one ESC seeing the majority of the voltage (And promptly breaking itself).

Remember that with V=IR it is all interconnected.

EDIT: I'm still quite oversimplifying myself here. Electronics can be weird!