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barcode in vb.net 2010 True Power, VA Power, and Reactive Power in Software
True Power, VA Power, and Reactive Power ANSI/AIM Code 39 Scanner In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Code 39 Extended Generator In None Using Barcode creation for Software Control to generate, create ANSI/AIM Code 39 image in Software applications. In an ac circuit or system containing nonzero resistance and nonzero reactance, the relationships among true power PT, apparent (VA) power PVA, and imaginary (reactive) power PX are as follows: PV A2 = P T2 + PX2 PT < PV A PX < PV A ANSI/AIM Code 39 Reader In None Using Barcode decoder for Software Control to read, scan read, scan image in Software applications. Code39 Creator In Visual C# Using Barcode drawer for Visual Studio .NET Control to generate, create Code 3/9 image in .NET framework applications. True Power, VA Power, and Reactive Power 269
Draw USS Code 39 In VS .NET Using Barcode encoder for ASP.NET Control to generate, create Code39 image in ASP.NET applications. USS Code 39 Printer In Visual Studio .NET Using Barcode printer for VS .NET Control to generate, create Code39 image in Visual Studio .NET applications. If there is no reactance in the circuit or system, then PVA = P T, and P X = 0. Engineers strive to minimize, and if possible eliminate, the reactance in powertransmission systems. Generate Code 3 Of 9 In VB.NET Using Barcode generation for .NET framework Control to generate, create USS Code 39 image in .NET framework applications. Barcode Maker In None Using Barcode creator for Software Control to generate, create bar code image in Software applications. Power Factor In an ac circuit, the ratio of the true power to the VA power, PT/PVA, is called the power factor. If there is no reactance, the ideal case, then PT = PVA, and the power factor (PF ) is equal to 1. If the circuit contains all reactance and no resistance of any significance (that is, zero or infinite resistance), then PT = 0, and therefore PF = 0. When a load, or a circuit in which you want power to be dissipated, contains resistance and reactance, then PF is between 0 and 1. That is, 0 < PF < 1. The power factor can also be expressed as a percentage between 0 and 100, written PF%. Mathematically, we have these formulas for the power factor: Data Matrix Generator In None Using Barcode maker for Software Control to generate, create Data Matrix image in Software applications. Code 128A Generator In None Using Barcode creator for Software Control to generate, create Code 128A image in Software applications. PF = PT/PVA PF% = 100PT/PVA When a load has some resistance and some reactance, then some of the power is dissipated as true power, and some is rejected by the load as imaginary power. In a sense, this imaginary power is sent back to the power source. There are two ways to determine the power factor in an ac circuit that contains reactance and resistance. One method is to find the cosine of the phase angle. The other method involves the ratio of the resistance to the absolutevalue impedance. Print UPCA In None Using Barcode printer for Software Control to generate, create GTIN  12 image in Software applications. Barcode Printer In None Using Barcode generator for Software Control to generate, create barcode image in Software applications. Cosine of Phase Angle Recall that in a circuit having reactance and resistance, the current and the voltage are not in phase. The phase angle ( ) is the extent, expressed in degrees, to which the current and the voltage differ in phase. If there is no reactance, then = 0 . If there is a pure reactance, then either = +90 (if the reactance is inductive) or else = 90 (if the reactance is capacitive). The power factor is equal to the cosine of the phase angle: Identcode Maker In None Using Barcode generation for Software Control to generate, create Identcode image in Software applications. 2D Barcode Drawer In Java Using Barcode printer for Java Control to generate, create Matrix Barcode image in Java applications. PF = cos
UPC  13 Decoder In Java Using Barcode decoder for Java Control to read, scan read, scan image in Java applications. UPCA Supplement 2 Scanner In Visual Studio .NET Using Barcode decoder for .NET framework Control to read, scan read, scan image in .NET framework applications. Problem 171 Suppose a circuit contains no reactance, but a pure resistance of 600 . What is the power factor Without doing any calculations, it is evident that PF = 1, because PVA = PT in a pure resistance. That means PT/PVA = 1. But you can also look at this by noting that the phase angle is 0 , because the current is in phase with the voltage. Using your calculator, you can see that cos 0 = 1. Therefore, PF = 1 = 100%. The vector for this case is shown in Fig. 175. Problem 172 Suppose a circuit contains a pure capacitive reactance of 40 , but no resistance. What is the power factor Here, the phase angle is 90 (Fig. 176). A calculator will tell you that cos 90 = 0. Therefore, PF = 0, and PT/PVA = 0 = 0%. None of the power is true; all of it is reactive. Recognizing Code 39 Full ASCII In VB.NET Using Barcode reader for .NET Control to read, scan read, scan image in .NET framework applications. Encode USS128 In Java Using Barcode drawer for Android Control to generate, create EAN 128 image in Android applications. 270 Power and Resonance in AlternatingCurrent Circuits
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showing the phase angle for a purely resistive impedance of 600 + j0. The R and jX scales are relative. Problem 173 Suppose a circuit contains a resistance of 50 and an inductive reactance of 50 in series. What is the power factor The phase angle in this case is 45 (Fig. 177). The resistance and reactance vectors have equal lengths and form two sides of a right triangle, with the complex impedance vector forming the hypotenuse. To determine the power factor, you can use a calculator to find cos 45 = 0.707. This means that PT/PVA = 0.707 = 70.7%. The Ratio R/Z The second way to calculate the power factor is to find the ratio of the resistance R to the absolutevalue impedance Z. In Fig. 177, this is visually apparent. A right triangle is formed by the resistance vector R (the base), the reactance vector jX (the height), and the absolutevalue impedance Z (the hypotenuse). The cosine of the phase angle is equal to the ratio of the base length to the hypotenuse length; this represents R/Z.

