Comments by "Nhit C" (@nhitc6832) on "How 3 Phase Power works: why 3 phases?" video.

  1. You can always learn something whether it's beneficial to you personally or not.
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  2. tho you'll get more power the more phases you add, the complexity and the cost to run such system increases significantly. So 3 phase provides a balance between power and cost. It's good enough so to speak.
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  3. You can think of the negative side of the battery as a neutral. Both serve as a path for current to return to the source.
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  4. n-phase power will provide constant power, except 1-phase and split phase like the 240/120 system in the U.S
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  5. there were 2 phases power systems. But they got phased out in the mid 20th century. 3 phase power system became standard.
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  6. because single phase plenty enough. 3 phases are utilized in most commercial buildings
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  7. I spent around $300 to learn about DC and AC circuit online. Money well spent! The same cource will probably cost 3 times as much at a university.
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  8. more phases create more complexities, which cost more to maintain. Imagine having 6 transmission lines that stretch for thousands of miles in stead of 3 wires. That cost will quickly add up. The cons (mostly cost) just far outweighs the pros, which is more power. Long time ago, engineers just decided that 3 phases are enough power pretty much for anything that uses electricity.
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  9. it's the Root Mean Square of the sinusoidal voltages. It basically tells you the equivalent DC voltage the results in the same amount of power. For example, given a load, 170V AC will deliver the same power as 120V DC.
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  10. I don't think it's complicated at all.
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  11.  @gamecubeplayer  2 phase is the minimum to create a rotating magnetic field. So 2 phases can in fact rotate a motor but not as efficiently and smoothly as 3 phases. As a matter of fact, some single phase AC compressor motors in residential HVAC system utilize a capacitor to mimic a 2 phase system. These motors don't require as much power as 3 phase motors, so a 2 phase is good enough.
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