Haifagirl, Pashuteh Yid,im not sure i know exactly why u cant use one wire to run the appliance but think of it like this, electric current in a wire is kind of like water in a pipe, what if a radiator only had one pipe of hot water going to it and no second pipe for the return, the hot water would not be able to reach the radiator because it has nowhere to go afterward likewise with electricity.
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