'Phase' refers to a winding into which a voltage is induced in an alternator or in a transformer or motor. The voltage across a phase is known as a 'phase voltage', and the current through it is a 'phase current'.
'Three-phase', means that there are three such windings in a machine, physically displaced from each other by 120 degrees, with each phase voltage is displaced by 120 electrical degrees.
The term 'phase' is sometimes, incorrectly, used to describe the 'hot' wire in an electrical installation -the correct term, though, is 'line'.
Two phases in a three phase power system are sometimes used for small amounts of three phase loading in residential and other locations (such as a pool pump). Two phases are only needed, and two single phase Transformers are used. One is for normal home use (the lighting transformer), which provides single phase service. The other transformer is connected along with the first so there are two phases, and a floating neutral that acts as a third phase to provide power to the three phase loads. This transformer is typically much smaller. This is more economical than providing three phase, three transformer power for a small amount of three phase load.
Answer
The above answer describes an 'open delta' three-phase system, not a two-phase system.
A two-phase system, which is rarely used anywhere these days, is provided by a generator having two armature windings ('phases') which are located at right-angles to each other.
This provides two phase voltages that are at displaced from each other by 90o.
If the two windings are connected independently from each other, then the system is described as a 'two-phase four-wire' system. If, on the other hand, the one end of each winding are connected together, the system is described as being a 'two-phase three-wire system'.
For a two-phase three-wire system, the voltage between the outer two conductors (the line voltage) is 1.414 times the phase voltage.
Most residential premises are supplied with a single phase supply. However, in some countries, such as here is Cyprus, it's not unusual to see residences with a three-phase supply provided (the advantage of which is not altogether clear, as most homes don't normally have any three-phase loads such as motors!).
For a three-phase three-wire system, the supply conductors are correctly termed 'lines' (not 'phases'!). The individual windings of the supply transformer are connected between these lines and are the transformer's phases.
For a three-phase four-wire system, the supply conductors are called 'lines' and the fourth conductor is called the 'neutral'.
Voltages between lines are called 'line voltages', whereas any voltage measured between any line and the neutral is termed a 'phase voltage'.
In most European countries, the secondary of the three-phase distribution transformer is star or wye connected, and is a four-wire system. Line voltage is then 400 V while the phase voltage is 230 V. Single-phase supplies are provided using one line conductor and one neutral conductor. To balance the load, alternate residences are supplied from alternate lines.
In North America, the secondary of the three-phase distribution transformer is delta or mesh connected, and a single-phase supply is obtained by means of two line conductors, with a line voltage of 240 V, and a centre-tapped neutral conductor from the common phase winding. This provides two 120-V together with one 240 V service to residential premises.
Testing of an electrical circuit for voltage requires the supply to be energized.
No, this voltage appears ACROSS individual phases, or BETWEEN a line conductor and the neutral
in our home most of the electrical appliances can work only on ac supply e.g. tubelights, fan, refrigeratorsand so on.else we can also say that dc supply is costlier then ac for the same amount of power.
If the motor is connected to an ungrounded delta supply service there will be no effect on the operation of the motor. If the motor is connected to a wye system supply service and the B phase grounds out, the motor's overload protection would take the motor off line from the electrical supply.
In a two-phase connection, the phases are displaced by 90 degrees. Two lines (not 'phases') of a three-phase system will provide a single-phase supply, not a two-phase supply.
Electrical supply boxes can be found from a local electrical warehouse or else try a good electrical supply store online, before you buy it should consult with a registered electrician.
Its function is to supply electrical power via a plug that is plugged into it to supply an appliance.
Testing of an electrical circuit for voltage requires the supply to be energized.
The unit of measurement for electrical energy used in the home is the kilowatt hour, and this is the unit which the electricity supply company uses to work out your bill.
It is the ground return for the two different phases of your AC supply line providing 115 volts between it and the red or black breaker supply lines in your breaker box. For 230 volts the common is not connected and the red and back lines supply 230 vacfrom breakers
NOT if your on a water supply dependent on electrical power for a water booster pump
No, this voltage appears ACROSS individual phases, or BETWEEN a line conductor and the neutral
On a WC macerator installation the electrical supply to the unit should be wired from a switch.
in our home most of the electrical appliances can work only on ac supply e.g. tubelights, fan, refrigeratorsand so on.else we can also say that dc supply is costlier then ac for the same amount of power.
If you are using electrical jargon and if this is a residential question, you are paying for power. In electrical jargon, watts is power and your meter measures watts. Work would be a measure of output and you always have a little less output than supply. I assure you the electric company isn't charging you for your output but what they supply. Energy is a question for a physicist.
electrical wires are selected to satisfy with the desired conditions and supply.
Home electrical service in the UK is 230 volts at 50 hertz.