I was just wondering if the following is true/possible: - Could a circuit be made that is connected from a terminal on one battery, through a load, and then connected to the opposite terminal of another battery, where the batteries aren't touching? I believe it isn't possible, but would someone be able to give a quick explanation as to why this doesn't work? Also: - What role does an 'earthing' or 'grounding' have in a circuit where there is an power source and then a return path to the source as well as a grounding? - On that note, could someone please clear up exactly how circuits with a grounding in them work in general? Circuits like this seem to defy the notion that "a circuit must be closed for current to flow" Thanks!