The construction of the core is different. Most 'core-type' three-phase Transformers have three limbs. Additionally, there are three sets of primary windings, and three sets of secondary windings.
Yes, there a difference between three phase and single phase electrical supply services.
Yes, there is a difference between single phase and three phase circuits.
No
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.
The only real difference would be the inverter and panelboard, and yes, 3-phase inverters are more expensive than single-phase.
All current is the passage of electric charges from one terminal to another through a conductor so there is no real difference in the type of current that flows in a 3 phase system compared to a single phase system.
If, by 'unit price', you mean the cost per kilowatt hour, then there is normally no difference between the cost of energy supplied whether by single-phase or three-phase supplies.
actually there is no difference between them. However in some counteries, single phase is used for domestic and three phase is used for industrial.
Yes, your single-phase 240V 60Hz MIG welder can typically work with a single-phase 230V 50Hz supply, but there are important considerations. The voltage difference is minor and usually acceptable, but the frequency difference may affect the welder's performance and efficiency. It's advisable to check the manufacturer's specifications for compatibility and, if needed, consult with a qualified electrician for any necessary adjustments or converters.
The difference between a single and a three phase online UPS is a 3 phase can supply a 100% unbalanced load on its output without affecting its performance. A single phase cannot supply a 100% unbalanced load on the output without affecting its performance.
Single phase.
The main difference between single-phase and three-phase power systems is the number of conductors or wires used to distribute electrical power. Single-phase systems have one live wire and one neutral wire, while three-phase systems have three live wires and one neutral wire. Three-phase power is often used in industrial settings for its ability to provide a more stable power supply and handle higher loads more efficiently compared to single-phase power.