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Electric power - from Wikipedia
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.
Modern systems installed by electricians
Increasingly, the jobs performed within the framework of electrical services must mount installation, which is responsible for supervising the specified object. It turns out that electricians not only assume the camera, but very often they take to install intercoms or video intercoms, which largely can increase the safety of people living in the building. This is very important in facilities where daily scrolls many people, such as in high-blocks and so on. These modern systems make people feel much safer in their own home.
Authority among customers
Customers will always choose a reliable service provider. The case concerns not only the electrical services or painting, but virtually every area. Therefore, many providers may boast all sorts of references. If you employ an electrician, they are important as that incompetent employee can lead to much more serious consequences than, for example, inept painter. Therefore, references in this profession are highly desirable and through it you can easily build a stable authority among customers, which nowadays allows you to pause for more specific customer with the right electric guitar.