About electric industry
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.
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.
Maintenance-free parking systems
Actually, more rarely we encounter a situation where the parking lot waiting for us the person collecting the fee for parking and issuing the appropriate tickets. Commonly used are now automated systems that allow you to dispense with the employment service in the parking lot. Customers themselves, usually using the touch panel choose certain options standstill. After driving into the parking traveled with him it is possible only upon payment of the appropriate fees and scanned the ticket. Parking systems are designed so that the most common problems that may arise during their lifetime the irregularities in the electricity and then the appropriate repair must address electrician.