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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
What to look for when choosing an electrician?
Many people are primarily choosing electrical services it is guided by the low price. On the one hand, yes, you can save in this way, but cheaper services often turn out to be insufficient to complete the repair electrical wiring. Therefore, choosing an electrician check to see if it is popular with customers, and they have experience in the profession performed. It turns out that the more experienced electrical, the better and more efficiently, you can remove the fault. This allows customers to get quick help, which admittedly can be expensive, but avoid thanks to frequent call an electrician to our installation.
Basic facts about electric power
Electric power is the product of two quantities: current and voltage. These two quantities can vary with respect to time (AC power) or can be kept at constant levels (DC power).
Most refrigerators, air conditioners, pumps and industrial machinery use AC power whereas most computers and digital equipment use DC power (the digital devices you plug into the mains typically have an internal or external power adapter to convert from AC to DC power). AC power has the advantage of being easy to transform between voltages and is able to be generated and utilised by brushless machinery. DC power remains the only practical choice in digital systems and can be more economical to transmit over long distances at very high voltages (see HVDC).
The ability to easily transform the voltage of AC power is important for two reasons: Firstly, power can be transmitted over long distances with less loss at higher voltages. So in power systems where generation is distant from the load, it is desirable to step-up (increase) the voltage of power at the generation point and then step-down (decrease) the voltage near the load. Secondly, it is often more economical to install turbines that produce higher voltages than would be used by most appliances, so the ability to easily transform voltages means this mismatch between voltages can be easily managed.
Solid state devices, which are products of the semiconductor revolution, make it possible to transform DC power to different voltages, build brushless DC machines and convert between AC and DC power. Nevertheless devices utilising solid state technology are often more expensive than their traditional counterparts, so AC power remains in widespread use.
Źródło: https://en.wikipedia.org/wiki/Electric_power_system#Basics_of_electric_power