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Why is the mains electricity supply in the UK 240V AC? Why not, for example 400V DC?In the early days of electricity distribution, there was a vicious competition between Edison (promoting DC) and Tesla (promoting AC).
Out of these "waves" only ocean waves are true waves that disperse their energy across the wave front i.e., the energy is shared in commonImagine an AM radio transmitter, delivering (say) 100kW at 1MHz. This emits radio waves, and the 100kW is dispersed across the whole wave front as is spreads out from the transmitter.