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Some electric facts
The electric power industry is the generation, transmission, distribution and sale of electric power to the general public. The electrical industry started with introduction of electric lighting in 1882. Throughout the 1880s and 1890s, growing economic and safety concerns lead to the regulation of the industry. Once an expensive novelty limited to the most densely populated areas, reliable and economical electric power has become a requirement for normal operation of all elements of developed economies.
By the middle of the 20th century, electric power was seen as a "natural monopoly", only efficient if a restricted number of organizations participated in the market; in some areas, vertically-integrated companies provides all stages from generation to retail, and only governmental supervision regulated the rate of return and cost structure.
Since the 1990s, many regions have opened up the generation and distribution of electric power to provide a more competitive electricity market. While such markets can be abusively manipulated with consequent adverse price and reliability impact to consumers, generally competitive production of electrical energy leads to worthwhile improvements in efficiency. However, transmission and distribution are harder problems since returns on investment are not as easy to find.
Źródło: https://en.wikipedia.org/wiki/Electric_power_industry
The phone to ask for the intervention of the electric
Very often it happens that we need to urgently call for help electrician. Electrical services are actually available in most of the clock and a phone call asking for intervention is possible at any time. Contact numbers for electricians we can find, among other things on the Internet. Before doing this, however, the phone should check that the electrical installation has not only a momentary fault or is caused by something we can remove on your own. Then call an electrician is unfounded. Repair of electrical installations is quite complicated and electricians often get calls asking about a possible valuation services. However, this is impossible in this field, with the case not aware of many customers
AC - from WIkipedia
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