The basic concept of a circuit kind of eludes me: Where do neutral/ground/negative wires ultimately go to (i.e. what must the 'thing' they connect to be)? Is it always ultimately the earth or must it be connected to the actual power generation itself somehow? Example: Could I take a battery, connect the positive terminal to a light, then take the other terminal from the light and run it into the earth and have the light light up, or must it go to the (-) terminal on the battery? Similarly, could I take the 'hot' wire from a house circuit and connect it to a bulb, then run another wire out of the bulb right into a stake in the ground? Or must it run to the 'neutral' wire (which runs where, to the power production plant?) So a more direct question might be, what is the mechanism that actually 'completes' the circuit. If at all possible to use the water analogy here: is the water forever being recycled and the generator/battery is like a pump. If this is so, how is this water being recycled into the pump? Alternatively, if it is possible to run a load from a higher voltage potential to the earth itself (v potential = 0), would this imply that the water is not in fact being recycled but rather 'absorbed into the earth's water table'?