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Topic: Circuit theory


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In the News (Fri 1 Jun 12)

  
  Circuit, Electric - MSN Encarta
A circuit of this type is termed a closed circuit, and a circuit in which the current path is not continuous is called an open circuit.
A short circuit is a closed circuit in which a direct connection is made, with no appreciable resistance, inductance, or capacitance, between the terminals of the source of electromotive force.
A series circuit is one in which the devices or elements of the circuit are arranged in such a way that the entire current (I) passes through each element without division or branching into parallel circuits.
encarta.msn.com /encyclopedia_761569464/Circuit_Electric.html   (758 words)

  
  Electrical network - Wikipedia, the free encyclopedia
To design any electrical circuits, electrical engineers need to be able to predict the voltages and currents in the circuit.
Linear circuits can be analysed to a certain extent by hand because complex number theory gives engineers the ability to treat all linear elements using a single mathematical representation.
This approximation comes down to splitting the circuit into two parts: a completely linear network with a number of terminals that connect to ideal diodes.
en.wikipedia.org /wiki/Electrical_circuit   (696 words)

  
 The Eight Circuits of Consciousness
No specific sixth circuit chemical is yet available, but strong psychedelics like mescaline (from my 1962-63 "sacred cactus," peyotl) and psilocybin (from the Mexican "magic mushroom," teonactl) open the nervous system to a mixed-media series of circuit V and circuit VI channels.
Specific exercises to trigger circuit VII are not to be found in yogic teaching; it usually happens, if at all, after several years of the kind of advanced rajah yoga that develops circuit VI facility.
Circuit VIII is triggered by Ketamine, a neuro-chemical researched by Dr. John Lilly, which is also (according to a wide-spread but unconfirmed rumor) given to astronauts to prepare them for space.
www.deoxy.org /8circuit.htm   (3497 words)

  
 ECE - Ciruits
A digital circuit is a circuit in which the signals are quantized into discrete levels, typically two.
An analog circuit is a circuit in which the voltages and currents are not categorized into quantized levels.
Modern circuits are integrated, in the sense that hundreds of thousands, or even millions, of transistors are fabricated and interconnected on a single piece of silicon, called a chip.
www.ece.uiuc.edu /ugrad/circuits.html   (556 words)

  
 Signal (circuit theory) - Wikipedia, the free encyclopedia
A signal within the context of circuit theory is any information that has value to a particular electronic network.
In a more concrete sense, the signals in a circuit are carried as changes in the voltages and currents of the circuit over time.
Any signal in a circuit theory setting can be defined as a scalar time varying value, more commonly recognized in a graph form, with the change in time placed along the bottom and the change in the scalar value along the side.
en.wikipedia.org /wiki/Signal_(circuit_theory)   (268 words)

  
 2026. Circuit Theory of Finance and the Role of Incentives in Financial Sector Reform
Circuit Theory of Finance and the Role of Incentives in Financial Sector Reform
The study identifies incentives to improve the efficiency and stability of financial circuits in emerging economies.
Circuit theory features important methodological advantages to analyze the role of finance, and to assess structural weaknesses of financial systems under different institutional settings and in diffeerent stages of economic development.
www.worldbank.org /html/dec/Publications/Workpapers/wps2000series/wps2026/wps2026-abstract.html   (465 words)

  
 BWCM - Crystal - AC Circuit Theory
Instead of being P=I*V as for DC, it changes to P=(1/2)*real(V*conj(I)) in general, and P=(1/2)*V*I for circuits where V and I are known to be in phase.
This time, however, this circuit will continue to resonate for some time after you disconnect the signal source, since there is a complete circuit path even when nothing is attached to it.
Rp is Rp from the parallel resonant circuit.
www.rocket-roar.com /BWCM/crystal/actheory.html   (3517 words)

  
 Basic Electric Circuit Theory
When the traditional approach to the exposition of electric circuit theory is practiced in the framework of a one semester course, phasors and impedances are usually introduced toward the end of the course.
In basic circuit theory, it is assumed that the values of resistances, inductances and capacitances are given.
We have observed that the mathematical form of circuit theory is not the major obstacle.
www.glue.umd.edu /~lawson/book.html   (1466 words)

  
 Circuit Theory of Linear Noisy Networks - The MIT Press   (Site not responding. Last check: 2007-11-01)
In the microwave tube case, however, the findings were based heavily upon the physical nature of the electron beam, and it was not immediately clear that a general theory of noise performance for any linear amplifier could be made without referring again to some detailed physical mechanism.
Such a theory had grown up around the problems associated with transistor amplifiers, and important parts of it were available to us through the association of one of us with Professor S. Mason.
The novel features of this tag are two in number: First, it clears up questions of the noise performance of low-gain amplifiers or of the effect upon noise performance of degenerative feedback; second, it provides for the first time a systematic treatment of the noise performance of negative-resistance amplifiers.
mitpress.mit.edu /catalog/item/default.asp?ttype=2&tid=4858   (610 words)

  
 'Circuit Board Theory'   (Site not responding. Last check: 2007-11-01)
I thought anyone who wasn't aware of this theory might be interested in knowing the whole story and seeing the photo attachments that accompanied the email.
The theory espoused in the following email is not, necessarily, the opinion of this editor.
The true artistry is where hey used "treated" circuit boards for many of the miniature shots in Apollo...
www.marsearthconnection.com /circuit.html   (1876 words)

  
 Atma-Sphere Music Systems - Papers
The single-ended triode circuit, shown in Figure 1, has been in use since the 1920s, and is the basic building block of 99% of all tube preamplifiers and most tube amplifiers in use today.
Even with catastrophic failure of an output device (be it a tube or a transistor), the lack of delicate parts in the output section prevents damage from occurring to anything except the failed device.
This type of circuit has all the advantages of cascode and differential amplifiers, resulting in an amplifier that has fewer parts for the amount of gain available than is possible using conventional triode circuits, while at the same time having lower distortion and noise.
www.atma-sphere.com /papers/theory.html   (1263 words)

  
 Circuit Theory Principles
The length of the hypotenuse is the magnitude of the impedance and the angle formed with the X axis determines the phase angle between the current and the voltage.
Since the Thevenin equivalent circuit only has one element an unknown resistance we can using the open circuit measured voltage as the source and the measured output voltage with the known connected resistance calculate the current and with it determine the internal resistance of the equivalent circuit.
Using this circuit it should be clear that the resistance between terminals AB is 625 ohms.
web.njit.edu /~ransom/ACcircuits.html   (2358 words)

  
 Basic Circuit Theory   (Site not responding. Last check: 2007-11-01)
Circuit theory for high voltage systems is essentially the same as for any other circuit.
The actual circuits for most high voltage equipment are actually quite simple, so not much analytical work is necessary to get an understanding of the expected behavior.
In fact, slavish use of mathematical circuit modelling may not be the best approach for high voltage circuits, because the characteristics of the components are not known accurately, and the effects of dielectric breakdown (e.g.
home.earthlink.net /~jimlux/hv/circuit.htm   (232 words)

  
 Fundamentals of Electrochemical Impedance Spectroscopy
It is the ability of a circuit element to resist the flow of electrical current.
Most of the circuit elements in the model are common electrical elements such as resistors, capacitors, and inductors.
This circuit models a cell where polarization is due to a combination of kinetic and diffusion processes.
www.gamry.com /App_Notes/EIS_Primer/EIS_Primer.htm   (5447 words)

  
 Electrical theory, part 1
Impedance, a term for total resistance in an alternating current circuit, is very similar to resistance and is measured in ohms.
Inductive reactance is the resistance to current flow in an AC circuit, due to the effects of inductors in the circuit.
In an inductive circuit, E leads I. So, the meaning of the “ICE” portion is I leads E in a capacitive circuit.
ceenews.com /mag/electric_electrical_theory_part   (1179 words)

  
 International Journal of Circuit Theory and Applications (JournalSeek)
Today the discipline of Circuit Theory has extended far beyond its traditional boundaries while the application of circuit theoretic ideas has made notable contributions to many diverse fields of science and engineering.
The International Journal of Circuit Theory and Applications is devoted to the publication of original work on both the theory and its applications.
The essential feature of the material published is that the ideas or techniques of Circuit Theory should have played a prominent part in the solution or elucidation of the problem.
journalseek.net /cgi-bin/journalseek/journalsearch.cgi?field=issn&query=0098-9886   (452 words)

  
 Circuit Theory #7
In figure 3, the left and right portions of the circuit are replaced with their Norton equivalents (while the center resistor remains unchanged).
Recall that in the Thevenin equivalent a complex circuit is replaced with a single voltage source and a series resistance.
Similarly, in the Norton equivalent, a complex circuit is replaced by a single current source (a source that maintains a specified current independent of the load resistance) and a parallel Norton resistance.
www.hallikainen.com /rw/theory/theory7.html   (1118 words)

  
 Pacemaker Project - Circuit Lab - Pacing Circuit Theory
The 510 ohm resistor on the right hand side of the circuit mimics the electrical load the heart places on the pacemaker.
In the left hand side of the circuit, current flows from the battery through the 21k (k=1,000) ohm resistor, through the switch, and back to the battery.
In the right hand side of the circuit, current flow is caused by the discharge of the 4.7 uF capacitor through wires in the patient's veins to the heart.
www.pacemakerproject.com /circuit_lab/cl_pacing_circuit_theory.htm   (340 words)

  
 Wiley::International Journal of Circuit Theory and Applications
The bringing together of papers describing advances in the theory and in the application of circuit theoretic concepts is intended to be of interest both in stimulating the wider use of such concepts and in posing new challenges for the circuit theorist.
The scope of the Journal comprises all aspects of the theory and design of analog and digital circuits together with the application of the ideas and techniques of circuit theory in other fields of science and engineering.
Examples of the areas covered include: Fundamental Circuit Theory together with its mathematical and computational aspects; Circuit modeling of devices; Synthesis and design of filters and active circuits; Neural networks; Nonlinear and chaotic circuits; Signal processing and VLSI; Distributed, switched and digital circuits; Power electronics; Solid state devices.
www.wiley.com /WileyCDA/WileyTitle/productCd-CTA.html   (478 words)

  
 Circuit Theory #6
Although it is quite possible (and appears standard) to bring the bridge down to a single Thevenin equivalent, I prefer to make two equivalent circuits, one for the left half of the bridge and one for the right half.
This approach allows us to determine all the circuit node voltages from the equivalent circuit while the typical "single equivalent" approach only yields the "load current" (the current through R5).
To determine the voltage at any point in the circuit, we can start at a point where we know the voltage (with respect to ground) and "wind" our way through the circuit accumulating voltage rises and drops.
www.broadcast.net /hallikainen/theory6.html   (1377 words)

  
 Boylestad's Electronic Devices and Circuit Theory Chapter 99 -- Glossary
Many chips are cut from a single wafer of silicon that has been doped and etched to form many elements and components.
equivalent circuit - Combination of elements intended to mimic the characteristics of an electronic device with mathematical aspects that are simpler than those of the actual device.
phase-locked loop - Circuit in which the phase of the output signal is compared to the phase of the input signal and adjustments made such that the output signal will lock onto and track the input signal.
cwx.prenhall.com /bookbind/pubbooks/boylestad_ca/chapter99/custom1/deluxe-content.html   (3098 words)

  
 Circuit Theory #13
This circuit is a low-pass filter that is generally used for impedance matching.
Recall that in this circuit all the reactances are 50 ohms, so the impedance of the inductors is 0+j50 or 50/ 90.
We find L2 directly in parallel with C2, forming a parallel resonant circuit (since the impedance of the capacitor is 0-j50 and the impedance of the inductor is 0+j50).
www.hallikainen.com /rw/theory/theory13.html   (1246 words)

  
 Signal Integrity, Impedance and Electrical Models > Circuit Theory and SPICE   (Site not responding. Last check: 2007-11-01)
The important rule in circuit theory is that when two or more elements are in series, that is, connected end-to-end, the impedance of the combination, from one end terminal to the other end terminal, is the sum of the impedances of each element.
The set-up of this circuit in SPICE and the resulting time-domain waveform, showing the ringing that might be found in the actual circuit, is shown in Figure 3-9.
If the constant-current source is connected to a circuit that has some impedance associated with it, Z(ω), then to keep the amplitude of the current constant, the voltage it applies will have to adjust.
www.phptr.com /articles/article.asp?p=102225&seqNum=9   (1423 words)

  
 What is Alternating Current?
Regardless of the specific source and load in this circuit, electrons leave the negative terminal of the source, travel through the circuit in the direction shown by the arrows, and eventually return to the positive terminal of the source.
When you close the circuit by turning on the light switch, the light turns on without regard for the direction of current flow.
When we examined DC circuit theory and discussed DC power losses above, we used capital letters to represent all quantities.
www.play-hookey.com /ac_theory   (2158 words)

  
 Antenna Theory Simplified Seminar Outline
However, the way that antenna theory is taught in schools and universities - it is too theoretical and abstract to be very helpful.
Transmitting and receiving antennas are analyzed using circuit theory to furnish the practicing engineer or technician with an intuitive understanding of antenna operation.
Transmission line theory combined with the theory of partial inductance are used to develop simple and accurate circuit theory models of dipole and loop antennas.
www.hottconsultants.com /outlines/antennas.html   (316 words)

  
 Alternator Theory v15
Unplugging the alternators regulator circuit may halt the RF interference; this is a pretty good indication that the Regulator circuit (diodes) is to blame.
The alternator is a three-phase generator with a built-in rectifier circuit consisting of six diodes in a full-wave bridge rectifier circuit.
Again with all of the different regulator circuits out there, some in-depth knowledge is required so that damage to the regulator circuits do not occur, and there are a plethora of designs out there, both OEM and especially after market.
oljeep.com /gw/alt/edge_Alternator_Theory.html   (10779 words)

  
 SSRN-Circuit Theory of Finance and the Role of Incentives in Financial Sector Reform by Biagio Bossone   (Site not responding. Last check: 2007-11-01)
SSRN-Circuit Theory of Finance and the Role of Incentives in Financial Sector Reform by Biagio Bossone
This study analyzes the role of finance in the context of a circuit model and shows how the financial system complements the price mechanism in coordinating decentralized intertemporal resource allocation choices by agents operating with limited information and incomplete trust.
Bossone, Biagio, "Circuit Theory of Finance and the Role of Incentives in Financial Sector Reform" (November 1998).
papers.ssrn.com /sol3/papers.cfm?abstract_id=597223   (549 words)

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