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barcode generator in vb.net Voltage/Current/Resistance Circuits 57 in Software
Voltage/Current/Resistance Circuits 57 Scanning Code 3 Of 9 In None Using Barcode Control SDK for Software Control to generate, create, read, scan barcode image in Software applications. Generate ANSI/AIM Code 39 In None Using Barcode encoder for Software Control to generate, create Code 3/9 image in Software applications. 44 Schematic symbols for incandescent lamp (A), fixed capacitor (B), fixed
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Code 128A Maker In None Using Barcode printer for Software Control to generate, create Code 128 image in Software applications. Make Code 3/9 In None Using Barcode printer for Software Control to generate, create Code 3/9 image in Software applications. Most dc circuits can be boiled down to three major components: a voltage source, a set of conductors, and a resistance. This is shown in Fig. 45. The voltage or EMF source is E; the current in the conductor is I; the resistance is R. You already know that there is a relationship among these three quantities. If one of them changes, then one or both of the others will change. If you make the resistance smaller, the current will get larger. If you reduce the applied voltage, the current will also decrease. If the current in the circuit increases, the voltage across the resistor will increase. There is a simple arithmetic relationship among these three quantities. Barcode Creator In None Using Barcode generator for Software Control to generate, create bar code image in Software applications. Painting ECC200 In None Using Barcode creator for Software Control to generate, create DataMatrix image in Software applications. 58 DirectCurrent Circuit Basics
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Data Matrix 2d Barcode Scanner In .NET Framework Using Barcode reader for VS .NET Control to read, scan read, scan image in Visual Studio .NET applications. Bar Code Generation In Java Using Barcode creation for Eclipse BIRT Control to generate, create bar code image in Eclipse BIRT applications. Ohm s Law
GS1 128 Generator In None Using Barcode drawer for Microsoft Word Control to generate, create EAN128 image in Word applications. Generating GS1  13 In Visual C#.NET Using Barcode creator for Visual Studio .NET Control to generate, create GTIN  13 image in VS .NET applications. The interdependence among current, voltage, and resistance in dc circuits is called Ohm s Law, named after the scientist who supposedly first quantified it. Three formulas denote this law: E = IR I = E/R R = E/I You need only remember the first of these formulas in order to derive the others. The easiest way to remember it is to learn the abbreviations E for voltage, I for current, and R for resistance, and then remember that they appear in alphabetical order with the equal sign after the E. Sometimes the three symbols are arranged in the socalled Ohm s Law triangle, shown in Fig. 46. To find the value of a quantity, cover it up and read the positions of the others. 46 The Ohm s Law
triangle. The voltage is E, the current is I, and the resistance is R. These quantities are expressed in volts, amperes, and ohms, respectively. Remember that you must use units of volts, amperes, and ohms for the Ohm s Law formulas to yield a meaningful result! If you use, say, volts and microamperes to calculate a resistance, you cannot be sure of the units you ll end up with when you derive the final result. If the initial quantities are given in units other than volts, amperes, and ohms, convert to these units, and then calculate. After that, you can convert the calculated current, voltage, or resistance value to whatever size unit you want. For example, if you get 13,500,000 as a calculated resistance, you might prefer to say that it s 13.5 M . Current Calculations 59
Current Calculations
The first way to use Ohm s Law is to determine current in dc circuits. In order to find the current, you must know the voltage and the resistance, or be able to deduce them. Refer to the schematic diagram of Fig. 47. It consists of a dc voltage source, a voltmeter, some wire, an ammeter, and a calibrated, widerange potentiometer. Problem 41 Suppose that the dc generator in Fig. 47 produces 10 V and the potentiometer is set to a value of 10 . What is the current This is solved by the formula I = E/R. Plug in the values for E and R; they are both 10, because the units are given in volts and ohms. Then I = 10/10 = 1.0 A. Problem 42 Imagine that dc generator in Fig. 47 produces 100 V and the potentiometer is set to 10 k . What is the current First, convert the resistance to ohms: 10 k = 10,000 . Then plug the values in: I = 100/10,000 = 0.01 A. You might prefer to express this as 10 mA. Problem 43 Suppose that dc generator in Fig. 47 is set to provide 88.5 V, and the potentiometer is set to 477 M . What is the current This problem involves numbers that aren t exactly round, and one of them is huge. But you can use a calculator. First, change the resistance value to ohms, so you get 477,000,000 . Then plug into the Ohm s Law formula: I = E/R = 88.5 / 477,000,000 = 0.000000186 A. It is more reasonable to express this as 0.186 A or 186 nA.

