Simply because it is cheaper. (You dont need the extra wire)
However you can only use a 3 wire system if the load is a balanced load. If the load is not balanced you need the fourth wire (neutral/return) to take the out of balance current.
AC or Alternating current, DC or Direct Current. DC is relative to most battery voltage systems, cars, pocket radios, so on. Alternating Current mainly relates to your household electric. Each differs in the way the electric is passed through the system, or battery. Unless your talking about the Rock Group, then I do not know there meaning or definition. Groups have there own language for things like that. It does not stand for After Christ / Devil Comes.
Technician A is incorrect; AC stands for alternating current, not "alternating voyage." Technician B is partially correct; while DC (direct current) is commonly used in electric motors for hybrid vehicles, many hybrid systems also utilize AC motors. Thus, both technicians have inaccuracies in their statements.
It's called a 'distribution transformer', as opposed to a 'power transformer' which is used in the transmission and primary-distribution electrical systems.
A circuit carrying current in one direction is called a direct current (DC) circuit. In a DC circuit, the flow of electric charge is constant and does not change direction. This is in contrast to an alternating current (AC) circuit, where the flow of electric charge changes direction periodically. DC circuits are commonly used in electronics and power transmission systems.
No. Transformers work in AC systems, not in DC systems.
The current you are referring to is called an alternating current (AC). It changes direction periodically to allow for efficient transfer of electricity in power distribution systems.
Edith Clarke has written: 'Circuit analysis of A-C power systems' -- subject(s): Alternating Electric currents, Alternating current, Electric circuits, Electric currents, Alternating, Electric power distribution
alternating current
Alternating current (AC) is a type of electric current that changes direction periodically. It is commonly used in household electricity systems because it allows for easy voltage transformation and long-distance transmission.
Three-phase 408V systems typically use alternating current (AC).
It's electrical current. Measured in amps.
A car alternator generates alternating current, then uses a rectifier to convert the alternating current to direct current, it charges your battery and supplies the current to run all the electrical systems in the car.
Alternating current is not necessairly low voltage, on the controrary AC is more oftenly used for when high voltage is needed. Most power distribution systems (extremely high voltages) use AC because AC is easier to transform to high voltages (using the aptly named transformer). High voltage is needed for power distribution to decreases losses due to transmission.
noAnswer'Power factor' is a quantity associated with alternating-current systems, and does not apply to direct-current systems'.
A transformer is a device used to change the voltage of an alternating current. It works on the principle of electromagnetic induction to increase (step-up) or decrease (step-down) the voltage level as needed. Transformers are commonly used in electrical power distribution systems to transmit electricity efficiently over long distances.
An alternating current (AC) is a type of electric current that changes direction periodically. It moves back and forth in a cyclic manner, typically in a sinusoidal waveform. AC is commonly used in household power supply systems and many electronic devices.
In North America the electrical system is alternating current at a frequency of 60 Hertz. Europe and the UK use alternating current at a frequency of 50 Hertz. Direct current systems are obsolete because of the inability to transmit the voltage over long distances.