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From Wkipedia
An electric power system is a network of electrical components used to supply, transfer and use electric power. An example of an electric power system is the network that supplies a region's homes and industry with power?for sizable regions, this power system is known as the grid and can be broadly divided into the generators that supply the power, the transmission system that carries the power from the generating centres to the load centres and the distribution system that feeds the power to nearby homes and industries. Smaller power systems are also found in industry, hospitals, commercial buildings and homes. The majority of these systems rely upon three-phase AC power?the standard for large-scale power transmission and distribution across the modern world. Specialised power systems that do not always rely upon three-phase AC power are found in aircraft, electric rail systems, ocean liners and automobiles.
Źródło: https://en.wikipedia.org/wiki/Electric_power_industry
Where to get knowledge about the repair installation?
Many people are asking where to get knowledge about the repair of electrical installations? Although qualified electricians certainly have responded to this question guided by Asker toward the professional literature at the present time, most people sięgnęłaby rather on the Internet. In the virtual network, you can find plenty of information with almost every aspect of life, and therefore advice on electricity can be found there. It is true that in this field the number of instructional videos is rather poor, but no shortage of sites with articles regarding the repair of electrical installations or simpler tasks that require knowledge of electrics.
AC power
Power in an electric circuit is the rate of flow of energy past a given point of the circuit. In alternating current circuits, energy storage elements such as inductors and capacitors may result in periodic reversals of the direction of energy flow. The portion of power that, averaged over a complete cycle of the AC waveform, results in net transfer of energy in one direction is known as active power (sometimes also called real power). The portion of power due to stored energy, which returns to the source in each cycle, is known as reactive power.
Źródło: https://en.wikipedia.org/wiki/AC_power