The electrons behave in a very different way, the flow of electrons changes direction 50 times (Spain) or 60 times (America) every second, as if the positive and negative poles of the socket were constantly changing places and the electric current is not always the same.
The variation of any electrical parameter over a period of time is an electric signal.
The tension or voltage of domestic electricity is an alternating signal because it alternates between positive and negative values. Its waveform is also sinusoidal, with a smooth, regula shape.
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