vb.net barcode reader code Earth ground in Software

Maker QR Code in Software Earth ground

Earth ground
Decode QR Code ISO/IEC18004 In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
QR-Code Printer In None
Using Barcode generation for Software Control to generate, create QR Code ISO/IEC18004 image in Software applications.
Part I
Scan QR Code In None
Using Barcode recognizer for Software Control to read, scan read, scan image in Software applications.
Make QR Code In Visual C#.NET
Using Barcode drawer for Visual Studio .NET Control to generate, create QR Code 2d barcode image in Visual Studio .NET applications.
Circuits
Encoding QR Code In VS .NET
Using Barcode creator for ASP.NET Control to generate, create Quick Response Code image in ASP.NET applications.
Create Denso QR Bar Code In Visual Studio .NET
Using Barcode generation for .NET framework Control to generate, create QR Code image in Visual Studio .NET applications.
Figure 762 Outdoor pool
Encode QR Code In Visual Basic .NET
Using Barcode printer for Visual Studio .NET Control to generate, create Denso QR Bar Code image in .NET applications.
EAN13 Creator In None
Using Barcode generator for Software Control to generate, create EAN13 image in Software applications.
120 V W _ GFCI G
Printing Bar Code In None
Using Barcode creator for Software Control to generate, create barcode image in Software applications.
UPC-A Supplement 2 Generation In None
Using Barcode encoder for Software Control to generate, create UPC Code image in Software applications.
Figure 763 Use of a GFCI in a potentially hazardous setting
Printing USS Code 39 In None
Using Barcode generator for Software Control to generate, create Code 39 Full ASCII image in Software applications.
Code 128C Creator In None
Using Barcode creator for Software Control to generate, create Code 128 image in Software applications.
Check Your Understanding
USPS PLANET Barcode Creator In None
Using Barcode generator for Software Control to generate, create USPS PLANET Barcode image in Software applications.
USS Code 39 Printer In Objective-C
Using Barcode encoder for iPhone Control to generate, create Code 39 Extended image in iPhone applications.
720 Use the circuit of Figure 757 to show that the I 2 R losses will be higher for a 120-V service appliance than a 240-V service appliance if both have the same power usage rating
Generating Bar Code In VS .NET
Using Barcode creation for ASP.NET Control to generate, create barcode image in ASP.NET applications.
Make Code39 In Java
Using Barcode printer for Java Control to generate, create Code 39 Extended image in Java applications.
GENERATION AND DISTRIBUTION OF AC POWER
DataMatrix Maker In .NET Framework
Using Barcode creation for ASP.NET Control to generate, create Data Matrix image in ASP.NET applications.
Code 128A Creator In .NET Framework
Using Barcode generator for Reporting Service Control to generate, create Code 128 Code Set B image in Reporting Service applications.
We now conclude the discussion of power systems with a brief description of the various elements of a power system Electric power originates from a variety of sources; in 17, electric generators will be introduced as a means of producing electric power from a variety of energy-conversion processes In general, electric power may be obtained from hydroelectric, thermoelectric, geothermal, wind, solar, and nuclear sources The choice of a given source is typically dictated by the power requirement for the given application, and by economic and
EAN13 Generator In Visual C#.NET
Using Barcode printer for Visual Studio .NET Control to generate, create GS1 - 13 image in .NET applications.
Encode Barcode In Java
Using Barcode encoder for Java Control to generate, create bar code image in Java applications.
7
AC Power
environmental factors In this section, the structure of an AC power network, from the power-generating station to the residential circuits discussed in the previous section, is brie y outlined A typical generator will produce electric power at 18 kV, as shown in the diagram of Figure 764 To minimize losses along the conductors, the output of the generators is processed through a step-up transformer to achieve line voltages of hundreds of kilovolts (345 kV, in Figure 764) Without this transformation, the majority of the power generated would be lost in the transmission lines that carry the electric current from the power station
18 kV 3 step-down transformer 345 kV Generator Generating plant 46 kV 3 step-down transformer 3 step-down transformer to industrial or commercial customer 140 kV
3 step-down transformer (sub-station)
4,800 V
4,800 V
Center-tap transformer
120/240 Volt Three-wire service
Figure 764 Structure of an AC power distribution network
The local electric company operates a power-generating plant that is capable of supplying several hundred megavolt-amperes (MVA) on a three-phase basis For this reason, the power company uses a three-phase step-up transformer at the generation plant to increase the line voltage to around 345 kV One can immediately see that at the rated power of the generator (in MVA) there will be a signi cant reduction of current beyond the step-up transformer Beyond the generation plant, an electric power network distributes energy to several substations This network is usually referred to as the power grid At the substations, the voltage is stepped down to a lower level (10 to 150 kV, typically) Some very large loads (for example, an industrial plant) may be served directly from the power grid, although most loads are supplied by individual substations in the power grid At the local substations (one of which you may have seen in your own neighborhood), the voltage is stepped down further by a three-phase step-down transformer to 4,800 V These substations distribute the energy to residential and industrial customers To further reduce the line voltage to levels that are safe for
Part I
Circuits
residential use, step-down transformers are mounted on utility poles These drop the voltage to the 120/240-V three-wire single-phase residential service discussed in the previous section Industrial and commercial customers receive 460- and/or 208-V three-phase service
CONCLUSION
This chapter introduced the essential elements leading to the analysis of AC power systems Single-phase AC power, ideal transformers, and three-phase power were discussed A brief review of residential circuit wiring and safety, and a description of an electric distribution network, were also given to underscore the importance of these concepts in electric power
The power dissipated by a load in an AC circuit consists of the sum of an average and a uctuating component In practice, the average power is the quantity of interest AC power can best be analyzed with the aid of complex notation Complex power is de ned as the product of the phasor load voltage and the complex conjugate of the phasor load current Complex power consists of the sum of a real component (the average, or real, power) and an imaginary component (reactive power) Real power corresponds to the electric power for which a user is billed by a utility company; reactive power corresponds to energy storage and cannot be directly used Although reactive power is of no practical use, it does cause an undesirable increase in the current that must be generated by the electric company, resulting in additional line losses Thus, it is customary to try to reduce reactive power A measure of the presence of reactive power at a load is the power factor, equal to the cosine of the angle of the load impedance By adding a suitable reactance to the load, it is possible to attain power factors close to ideal (unity) This procedure is called power factor correction Electric power is most commonly generated in three-phase form, for reasons of ef ciency Three-phase power entails the generation of three 120 out-of-phase AC voltages of equal amplitude, so that the instantaneous power is actually constant Three-phase sources and loads can be con gured in either wye or delta con gurations; of these, the wye form is more common The calculation of currents, voltages, and power in three-phase circuits is greatly simpli ed if one uses per-phase calculations
Copyright © OnBarcode.com . All rights reserved.