barcode printing using vb.net Measuring devices B. 6.6 V. C. 7. 0V. D. No way to tell; the meter is malfunctioning. in Software

Generation Quick Response Code in Software Measuring devices B. 6.6 V. C. 7. 0V. D. No way to tell; the meter is malfunctioning.

64 Measuring devices B. 6.6 V. C. 7. 0V. D. No way to tell; the meter is malfunctioning.
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3-18 Illustration for quiz question 20.
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CHAPTER
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Basic dc circuits
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YOU VE ALREADY SEEN SOME SIMPLE ELECTRICAL CIRCUIT DIAGRAMS. SOME OF
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these are the same kinds of diagrams, using the same symbols, that professional technicians and engineers use. In this chapter, you ll get more acquainted with this type of diagram. You ll also learn more about how current, voltage, resistance, and power are related in direct-current (dc) and low-frequency alternating-current (ac) circuits.
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Schematic symbols
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In this course, the plan is to familiarize you with schematic symbols mainly by getting you to read and use them in action, rather than by dryly drilling you with them. But it s a good idea now to check Appendix B and look over the various symbols. Some of the more common ones are mentioned here. The simplest schematic symbol is the one representing a wire or electrical conductor: a straight, solid line. Sometimes dotted lines are used to represent conductors, but usually, dotted lines are drawn to partition diagrams into constituent circuits, or to indicate that certain components interact with each other or operate in step with each other. Conductor lines are almost always drawn either horizontally across, or vertically up and down the page, so that the imaginary charge carriers are forced to march in formation like soldiers. This keeps the diagram neat and easy to read. When two conductor lines cross, they aren t connected at the crossing point unless a heavy, black dot is placed where the two lines meet. The dot should always be clearly visible wherever conductors are to be connected, no matter how many of them meet at the junction. A resistor is indicated by a zig-zaggy line. A variable resistor, or potentiometer, is indicated by a zig-zaggy line with an arrow through it, or by a zig-zaggy line with an arrow pointing at it. These symbols are shown in Fig. 4-1. A cell is shown by two parallel lines, one longer than the other. The longer line represents the plus terminal. A battery, or combination of cells in series, is indicated by
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66 Basic dc circuits
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4-1 At A, a fixed resistor. At B, a two-terminal variable resistor. At C, a three terminal potentiometer.
four parallel lines, long-short-long-short. It s not necessary to use more than four lines for any battery, even though sometimes you ll see six or eight lines. The symbols for a cell and a battery are shown in Fig. 4-2.
At A, a single cell. At B, a battery.
Meters are indicated as circles. Sometimes the circle has an arrow inside it, and the meter type, such as mA (milliammeter) or V (voltmeter) are written alongside the circle, as shown in Fig. 4-3A. Sometimes the meter type is indicated inside the circle, and there is no arrow (Fig. 4-3B). It doesn t matter which way it s done, as long as you re consistent everywhere in a schematic diagram.
Meter symbols. At A, designator outside; at B, designator inside. Either symbol is OK.
Some other common symbols include the lamp, the capacitor, the air-core coil, the iron-core coil, the chassis ground, the earth ground, the alternating-current source, the set of terminals, and the black box, a rectangle with the designator written inside. These are shown in Fig. 4-4.
Schematic diagrams 67
4-4 Nine common schematic symbols. A: Incandescent lamp. B: Capacitor. C: Air-core coil. D: Iron-core coil. E: Chassis ground. F: Earth ground. G: Source of alternating current (ac). H: Pair of terminals. I: Specialized component or device.
Schematic diagrams
Look back through the earlier chapters of this book and observe the schematic diagrams. These are all simple examples of how professionals would draw the circuits. There is no inscrutable gobbledygook to put in to make them into the sorts of circuit maps that the most brilliant engineer would need. The diagrams you have worked with are exactly like the ones that the engineer would use to depict these circuits.
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