By Richard C. Dorf, James A. Svoboda
Identified for its transparent problem-solving method and its emphasis on layout, in addition to the standard and volume of its challenge units, creation to electrical Circuits, 9e via Dorf and Svoboda might help you educate scholars to “think like engineers.” ample layout examples, layout difficulties, and the “How will we Check” characteristic illustrate the text’s specialize in layout. The assisting on-line WileyPLUS studying atmosphere allows the project and evaluation of particular strategies utilizing a whole variety of pedagogical good points. The ninth version maintains the improved use of problem-solving software program comparable to PSpice and MATLAB.
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Extra info for Introduction to Electric Circuits (9th Edition)
Example text
The goal is to determine the magnitude and direction of one or more circuit variables, and the final task is to verify that the proposed solution is indeed correct. Usually, the engineer first identifies what is known and the principles that will be used to determine the unknown variable. 6-1. Generally, the problem statement is given. 6-1. First, we describe the situation and the assumptions. We also record or review the circuit model that is provided. Second, we state the goals and requirements, and we Problem State the problem.
The voltage of an ideal voltage source is given to be a specified function, say v(t). The current is determined by the rest of the circuit. The current of an ideal current source is given to be a specified function, say i(t). The voltage is determined by the rest of the circuit. An ideal source is a voltage or a current generator independent of the current through the voltage source or the voltage across the current source. Engineers frequently face a trade-off when selecting a model for a device.
5 i(t) + – v(t) Independent Sources Some devices are intended to supply energy to a circuit. These devices are called sources. Sources are categorized as being one of two types: voltage sources and current sources. 5-1a shows the symbol that is used to represent a voltage source. Avoltagesourceisdescribedbyspecifyingthefunctionv(t),forexample, vðt Þ ¼ 12 cos 1000t or vðt Þ ¼ 9 or vðt Þ ¼ 12 À 2t An active two-terminal element that supplies energy to a circuit is a source of energy. An independent voltage source provides a specified voltage independent of the current through it and is independent of any other circuit variable.