What is Circuit analysis: Definition and 566 Discussions

A network, in the context of electrical engineering and electronics, is a collection of interconnected components. Network analysis is the process of finding the voltages across, and the currents through, all network components. There are many techniques for calculating these values. However, for the most part, the techniques assume linear components.
Except where stated, the methods described in this article are applicable only to linear network analysis.

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  1. Q

    Nodal analysis exercise,are my equations correct?

    Homework Statement We have the circuit in the figure.I have to find v using nodal analysis only. Homework Equations Converted 1/6 F to -3j and 2sin2t to -2j. The Attempt at a Solution In node v1 we have the equation 6= -12+ [v1/2] + [( v1-v)/1] In node v we have the equation 2j+ [(v1-v)/1]=...
  2. E

    Understanding Thevenin's Theorem

    Homework Statement You have a circuit (attached pic) and want to find the Thevenin equivalent resistance and voltage. Homework Equations See below The Attempt at a Solution OK< here's what confuses me. If I simply look at the total resistance of the circuit from A and B, it seems to me that...
  3. K

    Engineering C = 10^-6Analyzing Parallel RLC Circuits: A Challenging Homework Problem

    Homework Statement 2. Homework Equations Resonant Frequency = 1 / [2 * pi * squareroot(LC)] Inductive Reactance = 2 * pi * f *L Capacitive Reactance = 1 / (2 * pi * f * C) Q = XL/Rw BW = fr/Q[/B] The Attempt at a Solution The information in the handy dandy jpeg I created is LITTERALLY all...
  4. W

    Engineering Diode Circuit Analysis: Get Expert Help Now!

    < Mentor Note -- Thread moved to Homework Help from EE forum > hi guys I am studying on diode circuit but i cannot really analyse a circuit with a diode. I understand that the question is asking minimum Vout so the current source input should be -2.5mA but i cannot go beyond that. Can anyone...
  5. C

    Engineering Non Inverting Op-Amp Circuit Analysis

    Homework Statement For an input potential (Vin ) which is a 1V (peak) sinusoidal source. Calculate V1 and Vout Homework Equations - The laws for an op-amp - NVM The Attempt at a Solution Here is my attempt not sure if correct.
  6. M

    Circuit analysis - two sources of emf

    Hello all! I'm confused about an explanation that my textbook gives, and I'm wondering if someone can help me understand it. The passage is as follows: A circuit consists of a 12 V battery with negligible internal resistance, in parallel with a charging unit with an emf of 15 V and internal...
  7. M

    Simple Kirchoff's loop problem

    Homework Statement Find the currents going through each resistor. Homework Equations V=IR The Attempt at a Solution [/B] I have the problem worked out and I can't find any errors in my work. The issue is that my professor has: I1=-.0843 I2=.086 I3=.0017 However my physics professor is...
  8. T

    Engineering Op-Amp Circuit Analysis: Voltage and Current Calculations with R1 and R2

    Homework Statement Consider the circuit drawn below This diagram was the closest I could find online to the one equivalent to my question, but there are some adjustments I need to clarify. 1)Replace Rz, Rf, and Rin, to R1. 2)Also, in my question, there's an extra wire connecting Vout to the...
  9. U

    Labelling five-bus system power values

    I'm having trouble determining what the values are on my Power Analysis diagrams. I get confused with active power, reactive power, and complex power. Can someone take a look at my attachment and tell me if I labeled the values correctly? I'm mainly curious as to if my Sg3 value is correct and...
  10. F

    Engineering Struggling to Find My Mistake in Circuit Analysis | Beginner Level

    [Moderator Note: Thread content restored from archive. Relevant portions of the original attachment have been uploaded and included here] Hello, I am working on a beginner level circuit analysis problem due tomorrow, but my branch current values aren't making sense. I've been struggling to...
  11. M

    Analyzing an Electric Circuit: Finding Req with KVL and KCL

    Homework Statement [/B] http://imgur.com/Kq5e4Ka This is the circuit I need to find the Req for, the only things given are the Voltage of 7.1, and the resistance of each circuit. Homework Equations V=IR Kirchhoffs laws, the KVL and KCL.The Attempt at a Solution I have spent some time trying...
  12. E

    How to tell if the components are in parallel or series

    Homework Statement I need to work out the impedance of this notch filter, and what I really need is to know how to read the diagram, because if I can do that the rest isn't so hard. The diagram looks like this (I don't know if this uploaded right) So really, all I am trying to do is tell if...
  13. J

    Engineering Thevenin Equivalent for circuit with diagonal resistors

    Homework Statement Hi everyone! I'm trying to find the thevenin equivalent for part A of this circuit: http://imgur.com/4Jdg8w8 Homework EquationsThe Attempt at a Solution I first remove part B, that is, open circuit it entirely. Then I try to find Voc across the two terminals that are open. I...
  14. S

    Circuit Analysis: Solving the Mystery of V3's Voltage Directionality

    Hi guys. Really elementary question here, I've been kicking myself for ages trying to figure this out, but I suppose everybody needs a little nudge sometimes. I have been staring at this circuit diagram: From this page...
  15. X

    Engineering Do not understand Solution to this problem (AC Circuit Analysis)

    Homework Statement See The attached Images. 2. The attempt at a solution The problem I am having with this is the following. I do not know where he is getting these equations from. We haven't done anything like this in class. Although he keeps mentioning skills we learned in previous...
  16. E

    Engineering How Does Changing Capacitor Value Affect OPAMP Output Voltage?

    Hi! Here is my task: OPAMP circuit and output voltag are shown in image below. Assuming that OPAMP is ideal, come up with a solution by hand. Then change capacitor's value from 200nF to 33nF and output voltage will be: Explain why output voltages are different ( first has triangle shape...
  17. E

    Engineering Solving OPAMP Circuit Analysis Problem

    Hi! Here is my task: OPAMP circuit and output voltag are shown in image below. Assuming that OPAMP is ideal, come up with a solution by hand. Then change capacitor's value from 200nF to 33nF and output voltage will be: Explain why output voltages are different ( first has triangle...
  18. M

    Engineering Circuit Analysis -- Looking for Practice Questions

    I require a plenty set of questions on Circuit analysis for electrical engineering. Please suggest some source or book.
  19. C

    Engineering Circuit Analysis- Node Voltage Problem

    In the attached picture, I have the problem and the equations I've come up with to solve for the requested variables. I have found seven equations for the seven unknowns, however, after plugging them into a calculator my answer is wrong. Which equation(s) is/are wrong, and why? Relevant...
  20. B

    Engineering How Do You Calculate Total Impedance in a Tuned R-LC Circuit?

    Homework Statement Given data of the given tuned R-LC circuit: Q=1000 f_{resonance} = 1MHz I = 15 \mu A V_{s} = 2.5V R_{L} = 10kΩ C=2nF Calculate the bandwidth, half-power frequencies, the value of R and L. Estimate the impedance offered to the supply at resonance and...
  21. E

    Simple Circuit Analysis Given Power

    Today at work I was thinking hypothetically about a simple circuit that I was unable to get an answer that made any sense. What if you had a simple 12V source with a 5Ω resistor in series, also in series with a black box that consumes 60W of power. You aren't given any characteristics about...
  22. J

    Engineering Circuit Analysis - Resistors and a battery

    Circuit Analysis -- Resistors and a battery Homework Statement Hello, if you see the attached I am trying to find the current I4.My plan was to find Voltage across R4 and use Ohm's law. Homework Equations V=IR The Attempt at a Solution I have simplified the circuit down(attached pic), I...
  23. E

    Engineering Op-amp circuit analysis using a transfer function

    Homework Statement I have got transfer functions W(s) and Wk(s), where Wk(s) is correction transfer function. So I calculate W(s) and Wk(s) in series. Magnitude graph before correction: Magnitude graph after correction: The task is to make whole circuit and simulate it. Homework...
  24. I

    Engineering Understanding Diode Circuit Analysis: Common Confusions Addressed

    I have just started studying this topic and I am confused about several things. 1) Why does the assumption that D1 is reverse biased mean it is modeled as a switch? Are reverse biased diodes always modeled as a switch? 2) Also, why does the assumption that D2 is forward biased means it can...
  25. M

    Engineering How to Find Power in an RLC Circuit

    Homework Statement A1 = 5A, A2 = 4A, A3 = 3A. V = 120V a) Given the circuit above, find A4 b) Find the angle between E and IT. Draw a diagrammatic (?) and find the power in the circuit. c) Find the values of R, L and C. Homework Equations The Attempt at a Solution...
  26. W

    Engineering How Do You Solve Basic Electric Circuit Analysis Problems with KCL and KVL?

    Homework Statement From this circuit diagram assume Vs and R1 through R2 are known. Find the following: a) How many unknown currents are there? b) How many independent equations can be written using KCL? c) How many independent equations can be derived from KVL equations...
  27. U

    LR Circuit Analysis: Find Current i When Switch is Opened

    Homework Statement Switch S is closed for long time in the figure shown. Find the current i as soon as the switch is opened. The Attempt at a Solution At t=∞ inductor behaves as closed circuit. So, I can simply replace it with a wire and calculate the current which comes out to be 9A...
  28. A

    Steady State Circuit Analysis with Phasors

    Homework Statement Hello everyone! I have the following circuit to solve, and my result is a bit wrong... can you tell me please where's the mistake? E=10sin(1000t) Find the current delivered to the circuit. Find the equivalent impedance of the circuit. Find the equation of the current and...
  29. D

    Engineering Where Did I Go Wrong? Solving Admittance in a Basic AC Circuit

    Okay so I have been working on a problem for practice for an exam and this one question is really pissing me off. I can't find what I am doing wrong and I've redone it about five times. The question is asking for the admittance of the circuit and the answer is given as 2.29 S at an angle of...
  30. D

    Engineering Op Amp Circuit Analysis: Finding Unknown Voltage V(b) with R1 = 1 Ohm

    I have this problem where it's asking for the unknown voltage V(b). What information I get is what is in the image provided and that R1= 1 ohm. Okay so as I start this problem I remember that the voltage drop across the terminals is pretty much equal to zero because the current flowing through...
  31. F

    Physics Teacher's Basic Circuit Analysis Recipe Needs Tweaking

    I teach intro, calc-based physics. Below is a terse summary of my recipe for analyzing simple battery-resistor multi-loop circuits. It was working well, until we tried the circuit seen in the attachment. Depending on our selection of simultaneous equations, sometimes our analysis produced...
  32. S

    Engineering Circuit analysis - series capacitors

    I am hoping that general physics is the correct location for this problem, but if I am wrong please say so. I have a problem where two capacitors of different value are in series and are attached to a DC source. Homework Statement Image is a bit blurry but that is how our professor...
  33. F

    Engineering RCL Circuit Analysis: Vr, Vl, Vc

    Homework Statement i(t) = 0 for t<0 and 5*cos(50t) for t>=0 Vc(0) = 0 Circuit is current source, 5 ohm resister, 2 Henry inductor, and 3 Farad capacitor in series. Need to find Vr(t), Vl(t), and Vc(t), voltage across resistor, inductor, and capacitor. Homework Equations V= IR...
  34. C

    How Do You Determine the Starting Point of Phase in Circuit Analysis?

    When writing the question for the phase response of a circuit, how do I know when it begins. Like for example theta(jw) = 90 degrees - arctan( ) or theta(jw) = 0 degrees - arctan( ) ?
  35. C

    Engineering Basic Circuit Analysis, having difficulties

    Homework Statement Hi, this is my first time posting so if there is any advice on how to make this post cleaner, please tell me! I've been stuck on a problem and I can't figure out what I'm doing wrong. I have attached the problem and the attempt at solving the problem below. I am supposed to...
  36. D

    Engineering Analyzing AC Circuits: Finding Current and Thevenin Impedance

    Here I have a problem I am dealing with. I answered the question and have it shown on the picture but I would like a double check on it as I think I am getting wrong values. The circuit is shown at the top of the page. If you can't see the values are 10 ohms for the resistor, 3.2 mF for the...
  37. F

    Engineering Solving Opamp Circuit Analysis: Find V0/Vs

    Homework Statement Find the voltage gain, V0/Vs, for the circuit below. All resistors are in Ohms. Homework Equations I identified this as a non inverting amplifier. Therefore: V_{0}=\frac{R_{S}+ R_{f}}{R_{s}}V_g The Attempt at a Solution Vo = 8/3*V1 (v1 = output of U1)...
  38. ajayguhan

    Engineering Circuit Analysis 8e (Indian Edition): Where to Find Solutions?

    I bought engineering circuit analysis by hyatt, 8e (Indian edition)The book is great in explaining concepts but the answers to the excerise problems are not given. in the website mentioned in book there are only answers to selected problems for first six chapters, what about the remaining 12...
  39. U

    Engineering Node Voltage Circuit Analysis: Solving for V1, V2, and V3

    Hi, I am given a node voltage problem to find V1, V2, and V3 from this image below. http://puu.sh/77Sg3.png (v1+15)/20 + (v1-v2)/25 + (v3-v2)/50 + (v3 - 10)/10 = 0 18V1 - 12V2 + 24V3 = 50 V2: (v2-v1)/25 + v2/40 + (v2-v3)/50 = 0 17V2 - 8V1 - 4V3 = 0 15 = V3 - V1 Am I in...
  40. dwn

    Engineering Mesh Analysis: Solving for Current in Multiloop Circuits

    Homework Statement Attached an image. Homework Equations KCL The Attempt at a Solution 80 = 10i1 + 20(i1 - i2) + 30(i1 - i3) 30 = 12(i2 - i3) + 20(i2 - i1) 0 = 40i3 +30(i3 - i1) + 12(i3 - i2) 80 = 60i1 - 20i2 - 30i3 30 = 20i1 + 32i2 - 12i3 0 = -30i1 - 12i2 + 82i3 i1...
  41. dwn

    Engineering Mesh Circuit Analysis: Solving KCL Equations for i1, i2, and i3 | Homework Help

    Homework Statement I have attached an image of the problem: Homework Equations KCL Equation The Attempt at a Solution 0 = 2i11 + 3(i1-i2) 212 = 3(i2-i1) + 5(i2-i3) -122 = 3i3 + 5(i3-i2) 5i1 - 3i2 = 0 -3i1 +8i2 + 5i3 = 212 -5i2 + 8i3 = -122 Is this the correct approach? Also, does anybody...
  42. JasonHathaway

    Diode circuit analysis textbook

    Hi everyone, My subject basically revolves around diodes circuits and how to analyze them (AC, DC). What textbook do you recommend? (If there's one with many solved problems, that would be great.)
  43. E

    Engineering Multiple diode circuit analysis

    It is well known that in order to solve diode circuits we must assume state of diodes, replace diodes with appropriate model (0.7V voltage drop) and solve circuit. Then we check result and if it agrees with initial assumption, we successfully solved our circuit. If we mark number of diodes in...
  44. Avatrin

    Electric Circuit Analysis Textbook

    Hi I need a good book for circuit analysis (preferably, it should be available on my cell phone via, for instance, Kindle or Aldiko.. Or PDF). My curriculum includes AC and DC circuits with: Resistors Capacitors Inductors BJTs Diodes FETs (JFET and MOSFET) Opamps I have to be able...
  45. F

    Engineering Superpostion circuit analysis question

    The problem I am having is determining what is in series and what is in parallel. Now I am working with v1, so I1 has been removed and replaced with an open circuit and v2 has been replaced with a short. So does that mean that r2 || r4? and if so, does that also mean that r2 || r4 which...
  46. P

    Weak in Circuit Analysis what to do?

    Hey, I've found circuit analysis super difficult all my life. Just not one of my things I was born to do. However, now I am doing electronics engineering so that topic often in lectures. In class we have to do analysis of complex transistor cirucuit analysis using 2 port network and norton...
  47. S

    Electronics (Circuit Analysis) Questions

    Homework Statement Problem A http://imagizer.imageshack.us/v2/800x600q90/855/6v0c.png Problem B http://imagizer.imageshack.us/v2/800x600q90/853/1m2c.png http://imagizer.imageshack.us/v2/800x600q90/34/wfe4.png Homework Equations Kirchhoff's Rules/Ohm's Law Voltage Divider...
  48. M

    Voltage divider (circuit analysis)

    How am I suppose to use voltage divider to solve for V1? The first pic is the original pic The second pic is me solving for V1,Vx, and V2 The third pic is and equivalent circuit of the first pic... I did this to reason that V1 is the voltage across the 10k ohm resistor. Therefore using...
  49. L

    Engineering Superposition, circuit analysis.

    Hi, could check if I have the right answer please. The question (Q 4b) is in the attached image below. My answer is:First for analysis the DC voltage source. i2 = 0.82A, i1 = 1.97A therefore V across 10Ω resistor = 11.5V. For the analysis of the current source I got a bit confused...
  50. C

    Engineering A trivial circuit analysis question

    Homework Statement I had the question above in an exam. Although it's very trivial to analyze, I'm wondering what's wrong with part (e) of the question. It could be that I don't understand the hidden meaning behind this question, but I see it as obvious as that the current through RL...
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