An appliance that takes 120V, like a toaster, is connected to one half of the split 240 volt single phase and to the neutral. The neutral should always run at zero voltage and is required to return the current which comes back from the load to the power station.
A large appliance, like an electric stove or a clother dryer, is usually of the type that needs a lot more power, so - to keep the current draw as low as possible - it requires more voltage. This is supplied by connecting it to the full 240 volts single phase service by using both "split phases": the 120V "hot" with red insulation and the 120V "hot" with black insulation, along with the neutral. The neutral is used to provide power at 120 volts to a time clock and/or an appliance programmer (e.g. for the drying cycle time on a dryer) which don't usually run on 240 volts.
Some 240 volt appliances, like water heaters and some air conditioners, take the full 240 volts from both red and black hots but don't need a neutral.
Equipment having much larger motors, like elevator motors or motors driving machine tools in factories, usually use a 3 phase service, either with no neutral - called a "delta" configuration - or with a neutral, which is called a "star", "Y" or "wye" configuration.
For more information see the Related link and the answers to the Related questions shown below.
Yes, there a difference between three phase and single phase electrical supply services.
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.
Three phase uses a safety circuit away from the machine, two phases uses you as the safety circuit
A three-phase meter can be used for single phase while the reverse is not the case.
The currents between legs of a three phase circuit should be within about 10% of each other.
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.
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.
actually there is no difference between them. However in some counteries, single phase is used for domestic and three phase is used for industrial.
Three phase uses a safety circuit away from the machine, two phases uses you as the safety circuit
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.
A three-phase meter can be used for single phase while the reverse is not the case.
The currents between legs of a three phase circuit should be within about 10% of each other.
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.
Single phase inherently requires less equipment (it's cheaper). Three phase motors are more efficient than single phase.
120 degrees