Single phase power has a sine wave voltage that crosses zero before reversing its polarity. In the region near the zero-crossing there is not much power. At zero there is none at all. So single phase loads often need some trickery to deliver output in this area. Often it is just the inertia of the motor or appliance. Three phase power is always delivering power on one of its phases, and is thus preferred for generators, motors, machines and appliances that use lots of power. If the application is large power, or small power with weight restrictions (like automobiles!) Three Phase is preferred. DC (Direct Current) is the next step up for smooth high-power devices but requires rectification, regulation and smoothing to be useful.
Another problem with DC is that, for efficient long distance transmission, it cannot be simply converted to much higher voltages than the voltage at which it was generated at the power station. Similarly DC cannot be transformed down to safer, much lower mains voltages for use by consumers.
AC (Alternating Current) is used for high power generation and distribution because it can easily be transformed, using Transformers, to achieve very efficient power transmission over very long distances and can then be transformed down to low voltages for distribution to consumers. Two phase, and higher multi-phases are also used but very rarely.
Yes, there a difference between three phase and single phase electrical supply services.
Three phase uses a safety circuit away from the machine, two phases uses you as the safety circuit
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
Question is incorrect. in a 240 Volt single phase circuit, how can you have A phase and B phase?
The currents between legs of a three phase circuit should be within about 10% of each other.
Yes, there is a difference between single phase and three phase circuits.
Yes, there a difference between three phase and single phase electrical supply services.
The phase difference between the current through the resistor and inductor in an AC circuit is 90 degrees.
A single-phase circuit has one live conductor and one neutral conductor, typically used for residential applications. A three-phase circuit has three live conductors and one neutral conductor, used for higher power industrial applications due to its ability to provide a more balanced power distribution.
because of the reactances in the circuit
3 pole would be for 3 phase, 4 pole would be 3 phase & neutral
Three phase uses a safety circuit away from the machine, two phases uses you as the safety circuit
The difference between a single phase and a three phase motor is the amount of power conductors that feed the device. As to the other part of the question a three phase motor will not start or run on single phase. The phase angles on three phase are 120 degrees apart on a single phase system they are 180 degrees apart.
Question is incorrect. in a 240 Volt single phase circuit, how can you have A phase and B phase?
In a pure resistive circuit the voltage and current are in phase. In an inductive circuit they are fro zero to 180 degrees out of phase. If they are in phase the Power Factor is 1 and 180 degrees the PF is zero. The exact amount of the phase difference depends on the specific circuit.
actually there is no difference between them. However in some counteries, single phase is used for domestic and three phase is used for industrial.
The currents between legs of a three phase circuit should be within about 10% of each other.