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why current can't transmitt as wave?
No,it is impossible
because current requires a conducting medium to flow. Now if it is to be transmitted as wave, it has to pass through air, which is an insulator. It may be possible if we use a much higher electrical energy source to ionize air and let current pass through....but that is practically not possible.
as current is a good good conductor of eletricity and air is a poor conductor of eletricity so we can't transmitte current as a wave