no
Yes
Yes it does by the movement of electrons primarily over the surface of the copper conductor.
electricity can travel through anything with a positive and negative electrical charge
Yes, electricity can travel through a vacuum. Older cathode ray televisions send a beam of electrons at high speed through a vacuum. When they hit the screen they excite a "phosphor" which glows,...
Yes, but only if it is not pure water. Pure water, that is, H2O without any other substances, does not conduct electricity.
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