barcode in vb.net 2010 Rectification and Pulsating Direct Current in Software

Generation Code-39 in Software Rectification and Pulsating Direct Current

Rectification and Pulsating Direct Current
ANSI/AIM Code 39 Reader In None
Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications.
Code 3/9 Maker In None
Using Barcode maker for Software Control to generate, create USS Code 39 image in Software applications.
Batteries and other sources of direct current (dc) produce constant voltage. This can be represented by a straight, horizontal line on a graph of voltage versus time (Fig. 2-9). For pure dc, the peak and effective values are identical. But sometimes the value of dc voltage fluctuates rapidly with time. This happens, for example, if the waveform in Fig. 2-8 is passed through a rectifier circuit. Rectification is a process in which ac is changed to dc. The most common method of doing this uses a device called the diode. Right now, you need not be concerned with how the rectifier circuit is put together. The point is that part of the ac wave is either cut off, or turned around upside down, so the output is pulsating dc. Figure 2-10 illustrates two different waveforms of pulsating dc. In the waveform at A, the negative (bottom) part has been cut off. At B, the negative portion of the wave has been inverted and made positive. The situation at A is known as half-wave rectification, because it involves only half the waveform. At B, the ac has been subjected to full-wave rectification, because
Code 39 Recognizer In None
Using Barcode scanner for Software Control to read, scan read, scan image in Software applications.
Generate USS Code 39 In Visual C#
Using Barcode generator for .NET framework Control to generate, create USS Code 39 image in VS .NET applications.
Rectification and Alternating Current 29
Encode Code 3 Of 9 In .NET Framework
Using Barcode printer for ASP.NET Control to generate, create Code 39 image in ASP.NET applications.
Generating Code-39 In VS .NET
Using Barcode creation for Visual Studio .NET Control to generate, create Code-39 image in .NET framework applications.
2-9 A representation of pure
Paint Code-39 In VB.NET
Using Barcode generation for VS .NET Control to generate, create Code39 image in .NET framework applications.
Data Matrix 2d Barcode Generator In None
Using Barcode generation for Software Control to generate, create DataMatrix image in Software applications.
direct current (dc).
Generate Bar Code In None
Using Barcode maker for Software Control to generate, create barcode image in Software applications.
Bar Code Maker In None
Using Barcode drawer for Software Control to generate, create bar code image in Software applications.
all of the original current still flows, even though the alternating nature has been changed so that the current never reverses. The effective value, compared with the peak value, for pulsating dc depends on whether halfwave or full-wave rectification is applied to an ac wave. In Fig. 2-10A and B, effective voltage is shown as dashed lines, and the instantaneous voltage is shown as solid curves. The instantaneous voltage changes all the time, from instant to instant. (That s how it gets this name!) The peak voltage is
UPC Symbol Printer In None
Using Barcode drawer for Software Control to generate, create UPCA image in Software applications.
Code-39 Encoder In None
Using Barcode creator for Software Control to generate, create Code 39 image in Software applications.
2-10 At A, half-wave rectification of common utility ac. At B, full-wave
Drawing Code 11 In None
Using Barcode encoder for Software Control to generate, create USD - 8 image in Software applications.
ECC200 Generation In None
Using Barcode printer for Online Control to generate, create Data Matrix image in Online applications.
rectification of common utility ac. Effective voltages are shown by the dashed lines.
Recognize Code39 In Java
Using Barcode recognizer for Java Control to read, scan read, scan image in Java applications.
Bar Code Decoder In C#.NET
Using Barcode scanner for .NET framework Control to read, scan read, scan image in Visual Studio .NET applications.
30 Electrical Units
Encode Bar Code In Objective-C
Using Barcode creator for iPhone Control to generate, create barcode image in iPhone applications.
Scanning UCC - 12 In VB.NET
Using Barcode recognizer for .NET Control to read, scan read, scan image in Visual Studio .NET applications.
the maximum instantaneous voltage. Instantaneous voltage is never any greater than the peak voltage for any wave. In Fig. 2-10B, the effective voltage is 0.707 times the peak voltage, just as is the case with ordinary ac. The direction of current flow, for many kinds of devices, doesn t make any difference. But in Fig. 2-10A, half of the wave has been lost. This cuts the effective value in half, so that it s only 0.354 times the peak value. In household ac that appears in wall outlets for conventional appliances in the United States, the peak voltage is about 165 V; the effective value is 117 V. If full-wave rectification is used, the effective value is still 117 V. If half-wave rectification is used, the effective voltage is about 58.5 V.
Making EAN-13 In Java
Using Barcode creator for BIRT Control to generate, create GS1 - 13 image in BIRT reports applications.
Generating UCC - 12 In .NET
Using Barcode printer for ASP.NET Control to generate, create EAN / UCC - 13 image in ASP.NET applications.
Safety Considerations in Electrical Work
For our purposes, one rule applies concerning safety around electrical apparatus: If you have any doubt about whether or not something is safe, leave it alone. Let a professional electrician work on it. Household voltage, normally about 117 V (but sometimes twice that for large appliances such as electric ranges and laundry machines), is more than sufficient to kill you if it appears across your chest cavity. Certain devices, such as automotive spark coils, can produce lethal currents even from the low voltage (12 to 14 V) in a car battery. Consult the American Red Cross or your electrician concerning what kinds of circuits, procedures, and devices are safe and which aren t.
Magnetism
Electric currents and magnetic fields are closely related. Whenever an electric current flows that is, when charge carriers move a magnetic field accompanies the current. In a straight wire that carries electrical current, magnetic lines of flux surround the wire in circles, with the wire at the center, as shown in Fig. 2-11. (The lines of flux aren t physical objects; this is just a convenient way to rep-
2-11 Magnetic flux lines
around a straight, current-carrying wire. The arrows indicate current flow.
Magnetism 31
resent the magnetic field.) You ll sometimes hear or read about a certain number of flux lines per unit cross-sectional area, such as 100 lines per square centimeter. This is a relative way of talking about the intensity of the magnetic field. Magnetic fields are produced when the atoms of certain materials align themselves. Iron is the most common metal that has this property. The atoms of iron in the core of the earth have become aligned to some extent; this is a complex interaction caused by the rotation of our planet and its motion with respect to the magnetic field of the sun. The magnetic field surrounding the earth is responsible for various effects, such as the concentration of charged particles that you see as the aurora borealis just after a solar eruption. When a wire is coiled up, the resulting magnetic flux takes a shape similar to the flux field surrounding the earth, or the flux field around a bar magnet. Two well-defined magnetic poles develop, as shown in Fig. 2-12. The intensity of a magnetic field can be greatly increased by placing a special core inside of a coil. The core should be of iron or some other material that can be readily magnetized. Such substances are called ferromagnetic. A core of this kind cannot actually increase the total quantity of magnetism in and around a coil, but it will cause the lines of flux to be much closer together inside the material. This is the principle by which an electromagnet works. It also makes possible the operation of electrical transformers for utility current. Magnetic lines of flux are said to emerge from the magnetic north pole, and to run inward toward the magnetic south pole.
Copyright © OnBarcode.com . All rights reserved.