Why there is no two phase electrical inputs instead of three phase and single phase?
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To understand why we use three phases to transmit electrical power from one place to another, and not some other number like 1, 2, or 4, we need to understand some of the history behind how electrical power was generated and used.
Electrical power is generated by rotating machines, and although the first loads were mainly lights, very soon the load that used the most power was also a rotating machine - a motor. Electricity was a way for many motors to be driven from one large generator. This allowed for economic specialisation: companies were created that specialised in generating electricit...