what is 3 phase power? How does it work? How does it differ from 1 phase power that most residentials have? Why isn’t 2 phase power as popular?
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Alternating current has a current and voltage that change amplitude and direction over time. It is easy to get out of a generator and you can easily change voltage with a transformer. A higher voltage means a lower current at the same power. if the current is lower the losses in a electrical conductor is lower and you can more efficiently distribute electrical energy.
The number of phases is the number of wires you have where a change in voltage at the same rate but not at the same time
Look at [this image](https://www.electricaltechnology.org/wp-content/uploads/2021/11/Why-3-Phase-Power-Why-Not-6-%CE%A6-12-%CE%A6-or-More-Phases-for-Transmission.png) with 1,2, 3 and even higher phase currents. When the curve passes through zero there is no power at that time. When it is higher or lower the power depends on the side from the zero line.
If you consider the total power of all phases 1 phase to from max to zero. 2 phase to from max to around half of max. But for 3 phase it is always quite high, it never goes below 85% of max. That results in a more even load on generators and electrical motors. That is why 3 phase is in use it is more balances. More phases would make it even smoother but add a lot of extra wires and cost and it is not needed for the power grid.
If 1 or 3 phase is most common in the residential application depends on where you live on Earth. I have always had 3 phases of power where I live both in the apartment and stand-alone house. The only device that had used all 3 phases was the stove/oven it run on 400V 3-phase AC fused at 16A for a total power of 10.4kW. If you have 1 phase that is only 230V you need a wire that can handle 45 amps it would be very tick and hard to handle. But the load of other devices is spread out between the 3 phases. When direct electrical heating was used the radiators were spread out over the 3 phases
If you have 1 phase or split-phase like is common in Noth America what you get is a single phase from the 3 phase grid. The load is spread out by h
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