Circuit analysis Definition and 569 Threads

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. H

    Circuit analysis - Finding the currents

    Homework Statement Find the three currents in the image. Homework Equations Khirkoffs laws Sum of currents equal zero. The potentials around a closed loop add up to zero. The equations given in the solution are -2I_1 + 12I_2+6=0 -12I_2+8 = 0 I_1+I_2+I_3=0 The Attempt at a...
  2. O

    A Kirchhoff's Law Circuit Analysis Problem

    Homework Statement If R=1.29×103 Ω and ε=239 V, determine the magnitude of the current in the horizontal wire between a and e. http://img10.imageshack.us/img10/3746/sbpic2823.png Homework Equations Kirchhoff's circuit laws.The Attempt at a Solution I'm having trouble mostly with getting...
  3. K

    Engineering Circuit analysis, problems with Laplace?

    Homework Statement The switch k is turned at t=0. Calculate i_k(t), when t starts from 0. You can find the circuit in my link. Homework Equations All of them, basically. :-p The Attempt at a Solution http://www.filefactory.com/file/af19a7h/n/index_mht You can find my attempt...
  4. K

    Engineering Circuit analysis, determing impendance.

    Homework Statement I need to find the impedance of the following circuit: Homework Equations \frac{1}{Z_eq}=\frac{1}{Z_1}+\frac{1}{Z_2} Z=R Z=\frac{1}{i \omega C} The Attempt at a Solution This should be really simple, but I seem to have some troubles. So: \frac{1}{R}+i...
  5. F

    Engineering Circuit Analysis: Find V_0 for R_eq = 3kOhm and I_s = 6mA

    Homework Statement |------|----a | |^ + | || R_eq I_s V_0 | | | | - |------|----b R_eq = 3kOhm I_s = 6mA Find V_0. Homework Equations Ohm's law: KVL, KCL The Attempt at a Solution Should this work just like any other circuit where V =...
  6. A

    Engineering Solve Circuit Analysis Problem: Tips & Advice

    Can anyone please suggest how to proceed with the first question.. Thanks in advance!
  7. D

    How Do You Analyze Circuits Containing Diodes?

    How do I do basic circuit analysis of circuits that have diodes in them? For example, if I have a basic circuit consisting of just a voltage source, a resistor, and a silicon diode, how would I calculate the current in the circuit?
  8. A

    Circuit Analysis: Voltage Direction & Power Questions

    I have the following circuit: My question is, what do I take the voltage direction to be? For the center component, it is 200V in a positive direction being upwards so does that mean that for the other components (20A and 10A), it is also in that direction? Thanks in advance. :smile...
  9. T

    How can circuit analysis questions be simplified and solved using KCL and KVL?

    Homework Statement Hey, attached is a word document with the three problems. The third problem gave me no grief but the first two I'm unsure about. Homework Equations V=IR The Attempt at a Solution Question 1: let I1 = current flowing through 20kohm resistor let I2 = current...
  10. T

    Simple Circuit Analysis: Finding i_{x} with Mesh Analysis

    Homework Statement Use mesh analysis to find i_{x}. http://img16.imageshack.us/img16/3384/circuitwd7.jpg Where R_{1} = 100 ohms , R_{2} = 50, R_{3} =100, R_4 = 220, and R_{5} = 470. V_{s} = 15 V. Homework Equations V = iR \Sigma V=0 The Attempt at a Solution First of...
  11. X

    Circuit Analysis: Find i, v Given R1, R2

    Homework Statement (a) Suppose that R_1 = 6 ohms and R_2 = 3 ohms. Find the current i and the voltage v. See the diagram in the picture. http://img291.imageshack.us/img291/7638/picturewr3.th.jpg Homework Equations Kirchhoff's laws and Ohm's law The Attempt at a Solution I got v=12V and...
  12. J

    Engineering Circuit Analysis Help: Find Frequency Response Equation

    I have to find the frequency response equation for this circuit in the attatched photo, but i don't know how to go about analysing it as I cannot see how to do voltage loop and node analysis does not work as the two nodes are not related so nothing can be eliminated from the generated...
  13. J

    Circuit Analysis Help: Find Frequency Response Equation

    I have to find the frequency response equation for this circuit in the attatched photo, but i don't know how to go about analysing it as I cannot see how to do voltage loop and node analysis does not work as the two nodes are not related so nothing can be eliminated from the generated...
  14. A

    Engineering ANOTHER simple circuit analysis question

    Homework Statement the question can be found here: http://www.mailfreeonline.com/uploader/5731C3EE.jpg Homework Equations The Attempt at a Solution i couldn't do parts a and b. part c: i added resistors in parallel and somehow got a value that Vo = 9.33V (part of the circuit...
  15. A

    Engineering Simple circuit analysis - can someone check if it's right?

    simple circuit analysis -- can someone check if it's right? Homework Statement (circuit can be found on http://www.MailFreeOnline.com/uploader/A723E91C.jpg ) i. write down equations relating i1 and v1, i2 and v2 and i3 and v3 ii. solve for the voltages v1, v2 and v3 iii. determine the...
  16. A

    Engineering Calculate I in Complicated Circuit Analysis

    i have the following circuit and I'm tryingto calculate I. (the values shown by the resistors are all ohms.) i can do this fine normally, but the addition of a resistor in the middle just complicates things. can anyone help me out? a picture of the crcuit has been attached.
  17. H

    Engineering Circuit analysis: find Network Function

    Given the following circuit: (see attached file) find the Network Function between I_L, flowing as drawn in picture, AND I_g. I guess all the calculation should lead up to an expression like this one: I_L(s)=F(s) I_g(s), where F(s) is a function in "s" which corresponds to the NETWORK FUNCTION...
  18. S

    Circuit Analysis - Solving for unknown Voltage

    1.Check Image 3. Perhaps there are other ways to solve the problem but if I use nodal analysis, I am confused on how a SUPERNODE will be formed. my equations:(Vo-30)/1 = (Vo-v1)/4 + (Vo)/2 V2/16=3 -v1 +2vo+v2=0 -------------------------------------------------- v2 = 3*16=48 2Vo-v1=-48 v1=...
  19. M

    Solving Circuit Analysis with Nodal Analysis - Help Needed!

    Hey guys. I have attached a circuit that i am trying to analyse using nodal analysis. This is how i am doing it: at node 2: (v2-v1)/1 + v2/4 + (v2-v3)/1 = 0 at node 3: (v3-v2)/1 + v3/2 = 4A at node 1: v1/25 = 2A but i am not getting the right results for v1, v2 and v3. Can...
  20. I

    Engineering How Does Initial Current Affect Circuit Analysis Using Laplace Transforms?

    Homework Statement The question is as shown in the first picture. Question1.jpg Homework Equations The Attempt at a Solution It asks that initial condition current generators are used, what I believe models the circuit for t>0 is shown in the second picture with the switch open, and a current...
  21. S

    Engineering How Many Methods Can Be Used to Solve for Vo in Circuit Analysis?

    solve Vo in as many ways as possible The Attempt at a Solution - This is more of a question to find out if there are any other possible ways of solving this problem. So far I have solved using: Nodes, Mesh, Loops, Superposition, Thevenin and Superposition Combined, Norton...
  22. R

    Diode Logic Gates circuit analysis?

    I need to understand how diode-resistor gates work. I've read a lot about what's supposed to happen based on inputs, but I need to see some numbers & analysis to understand what's going on. Where do you start in terms of trying to analyze the following AND gate...
  23. V

    RC circuit analysis using phasors

    Homework Statement I can't post pictures as I do normally, so you'll have to deal with the cumbersome attachment method! It's just a simple RC circuit. Resistor on top, capacitor on right side with the sinusoidally varying voltage source on the left...
  24. J

    Circuit Analysis: Best Books on Mesh, Nodal, Superposition & Thevenin/Norton

    Can anyone recommend a good book on circuit analysis, right now focusing on mesh, nodal, superposition, thevenin/norton? The book I'm using (hayt et al) doesn't give enough examples nor problems at the end of the chapter. I took a look at schaum's outline but it seems to rarely use dependent and...
  25. S

    Engineering Circuit Analysis Problem [electrical engineering]

    Homework Statement & Homework Equations: The following is a homework/quiz problem that I've been given to complete for minimal marks. I understand fully that this forum is not a "hey, here's my assignments; please do them for me one". However, I fully intend to understand the principles...
  26. Alpha Russ Omega

    Engineering Solving Circuit Analysis: Find Vs & Is with V2=20V, R1=6K, R2=10K, R3=2K

    Hello. This is a strange problem that I ran into in my homework. I did not use one of the resistors in the second loop. I don't think this is correct and I am really confused. I have no idea how else I could set this up to solve for the needed variables. Find Vs and Is, if V2 = 20V, R1 = 6K, R2...
  27. B

    Engineering  Circuit Analysis Problem #5 - Guidance Needed

    Homework Statement Hi, I have problem doing this problem: It is the problem #5 on the attachment.( I was not able to remove problem#4) Please can you give me some guidance? Thank you B Homework Equations The Attempt at a Solution I know that for t>0( steady state) the...
  28. M

    Is My Transistor DC Circuit Analysis Correct?

    I have an amplifier circuit as shown in this picture, http://www.fileden.com/files/2006/8/19/175303/4.wmf" And I need to do a DC analysis on it to find the current into the base lead (I_B) and the voltage over the collector-emitter (V_CE). Realizing this is DC and that the capacitor will...
  29. S

    Engineering How Does Setting Rx to 60k Affect the Output Voltage in an Ideal Op Amp Circuit?

    1. http://img248.imageshack.us/img248/8971/opampanalysisxe2.png Assume that the op amp in the circuit shown is ideal. a.) Find the output voltage when the variable resistor Rx is set to 60k Assuming Ideal Op amp. All currents leaving nodes are negative. V+ = V- = 0 and In = Ip = 0...
  30. N

    Node Voltage Method in Circuit Analysis

    I really don't understand exactly how they got the term highlighted in yellow. We want to get all values for all of the currents coming into or out of the node...so why does it have what appears to be the voltage across the 1 ohm resistor divided by the equivalent resistance of the 1 ohm and...
  31. R

    Engineering One Term is missing for Circuit Analysis Help to Solve it?

    Homework Statement Find I_0 using Nodal Analysis. http://img263.imageshack.us/img263/394/untitledph7.png I'm kind of lost for where my box is on the upper right corner. I don't know how to model the 20v Vsource as a current... can you even do that? I've done the other nodes, though I'm not...
  32. R

    Engineering Why Can't the Node Near +V_o Be +13 Volts in This Circuit Analysis?

    Homework Statement http://img145.imageshack.us/img145/1827/screenshot01hb8.jpg If I set my reference node to be dead in the middle of the circuit, why can't the node near the + V_o be +13Volts?
  33. V

    CIRCUIT ANALYSIS: Non-Ideal OpAmp with 2 resistors - Find Thevenin Equivalent

    Homework Statement There is a non-inverting op-amp below. http://img291.imageshack.us/img291/8242/chapter5lastproblemea1.jpg The op-amp is NOT ideal. We assume that R_i\,=\,\infty, R_0\,>\,0 and A is finite. Find the general Thevenin equivalent circuit seen at the terminals...
  34. V

    CIRCUIT ANALYSIS: 8 Resistors, 1 IVS, 1 Differential Op-Amp - Find Vo

    Homework Statement The circuit below is a differential amplifier driven by a bridge, find V_0. http://img476.imageshack.us/img476/8827/chapter5problem48fi2.jpg Homework Equations KCL, v = i R, Ideal Op-Amp relationshipsThe Attempt at a Solution I added 4 voltage markers...
  35. N

    Engineering I need a 2nd opinion on a circuit analysis answer

    Homework Statement Use superposition to find I_L Homework Equations -The overall current is the sum of the currents supplied by each source individually The Attempt at a Solution for source B only (current source is open): ---ohm's law: \frac{100V}{15k + j25k} = 3.43mA(...
  36. R

    Engineering How Do I Correctly Calculate Vba in Basic Circuit Analysis?

    Homework Statement Please view the attached image. Homework Equations P = VI = I^2 R = V^2 / R V = IR KVL The Attempt at a Solution I'm having trouble with part A. I got part B. My Part A Problem: I chose my reference direction of I to be going clockwise (to satisfy passive sign...
  37. X

    Engineering Need help w/ circuit analysis

    Need urgent help w/ circuit analysis Use mesh anyalysis to find the power delivered by the current-controlled voltage source in the circuit in: Link: https://www.physicsforums.com/attachment.php?attachmentid=9008&stc=1&d=1170300049
  38. V

    CIRCUIT ANALYSIS: Use source transformation to find the Voltage Vo

    Homework Statement Use source transformation to find the voltage V_x in the circuit below. http://img207.imageshack.us/img207/5150/chapter4problem24ij9.jpg Homework Equations V_S\,=\,i_S\,R i_S\,=\,\frac{V_S}{R} KCL, KVL, v = i R, super-node? The Attempt at a Solution...
  39. V

    CIRCUIT ANALYSIS: Use superposition to find the current I

    Homework Statement Use superposition to find I in the circuit below. http://img249.imageshack.us/img249/5889/chapter4problem15hd1.jpg Homework Equations KCL, KVL, Super-position principle, V = i RThe Attempt at a Solution I turn only one source on at a time and solve for I_1 through I_3...
  40. V

    Engineering CIRCUIT ANALYSIS: 3 Resistors, 3 Voltage Src, 1 Current Src - Find v1, v2, v3

    Homework Statement Find the node voltages V_1 through V_3 in the circuit below. http://img413.imageshack.us/img413/2240/chapter3problem328an.jpg Homework Equations KCL, KVL, V = i R, super-nodeThe Attempt at a Solution I added 5 currents and 2 KVL loops...
  41. V

    Engineering CIRCUIT ANALYSIS: 7 resistors, 2 Indep. Volt Source, V.C.C.S, V.C.V.S. - find I

    Homework Statement For the circuit below find I_1 and I_2: http://img155.imageshack.us/img155/8330/chapter2problem84ro6.jpg Homework Equations KVL KCL Ohm's Law The Attempt at a Solution I tried the problem many times, but I always get crazy answers. It seems that every...
  42. V

    Engineering CIRCUIT ANALYSIS: 7resistors & 1 I.V.S. - Find equivalent resistance and current

    Homework Statement Find R_{eq} and i_0 in the circuit below. http://img215.imageshack.us/img215/3074/chapter2problem38aw0.jpg Homework Equations v\,=\,i\,R Parallel and series resistor equations.The Attempt at a Solution After using the resistor equations to get down to R_{eq}, I get the...
  43. V

    Engineering CIRCUIT ANALYSIS: Find the equivalent resistance seen by the source

    Homework Statement Using series/parallel resistance combination, find the equivalent resistance seen by the source in the circuit below. Find the overall dissipated power. http://img300.imageshack.us/img300/6132/chapter2problem34au4.jpg Homework Equations For resistors in series...
  44. V

    Engineering CIRCUIT ANALYSIS: 2 resistors, Indep. Current Source, V.C.C.S - find v0

    Homework Statement Find v_0 in the circuit below and the power dissipated by the controlled source. http://img291.imageshack.us/img291/5479/chapter2problem22wy5.jpg Homework Equations KCL v\,=\,i\,RThe Attempt at a Solution KCL: i\,=\,2\,v_0\,+\,10\,A v_o\,=\,i\,R...
  45. D

    Circuit analysis (thevenin equivalence)

    Homework Statement http://img509.imageshack.us/img509/5658/circuituz5.jpg Find the current through resistor X for V = 7V Homework Equations Thevenin equivalence? The Attempt at a Solution Right I was advised a way to do this by assuming a 1A current flows through the resistor...
  46. V

    A good book for intro circuit analysis?

    Can anyone reccomend me a good book and introductory electrical engineering circuit analysis? I currently have Basic Engineering Circuit Analysis by Irwin/Nelms, but am not too fond of it. Thanks
  47. V

    How to Formulate Circuit Analysis Equations into Matrix Form?

    Using superposition, find v_0 in the following circuit. My work so far: v_1\,=\,2\,i_2\,+\,v_{0\,1} v_1\,=\,4\,i_1 v_{0\,1}\,=\,3\,i_3 v_{0\,1}\,=\,6\,i_4 KCL @ v1: 1\,A\,=\,i_1\,+\,i_2 i_2\,=\,i_3\,+\,i_4 Using these six equations, with 6 variables...
  48. O

    Please help Circuit analysis (Thevenin voltage and internal resistance)

    URGENT! Please help! Circuit analysis (Thevenin voltage and internal resistance) Hi guys, I am really stuck on this portion of my lab and it's due tomorrow! Please help! I have two questions: The first deals with the diagram from the left of the attached picture. I have to prove that...
  49. R

    Voltage Divider Equation: TTL Circuit Analysis

    http://img153.imageshack.us/img153/9007/untitledvb8.png That is my TTL circuit. I forgot to add +5v and a circle at the top of the diagram, so pretend it's there. Do I have to use the voltage divider equation to get the value of Vout? (5v)(Rl)/ (Rl + Rc) where Rl = 1kohm, Rc = 100kohm?
  50. F

    Engineering Circuit Analysis: Equation Derivation Help

    I am trying to solve a homework problem. I need some help to get going in the right direction if possible. My equation I am starting with is: Vc(t) = 5(1-e^(-t/T)) and I have to end up with these two equations: If T > 1/10f then for a 5 V square wave with a 50% duty cycle, the...
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