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. 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...
  2. 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...
  3. 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...
  4. J

    Engineering RC Circuit Analysis: Find di/dt & Show Current=0 After 1 Time Constant

    Homework Statement Use current equation and find di/dt expression, hence show if initial gradient were maintained the current would be 0 after 1 time constant. Homework Equations I calculated RC to be 0.5s i=0.02e^-t/0.5 The Attempt at a Solution I solved di/dt to be...
  5. S

    Engineering Determining Constants in Second Order Circuit Analysis

    Homework Statement This was an electrical engineering lab, dealing with the steady state response of an RLC circuit (diagram attached). The main part of the lab consisted of experimentally determining the circuit's critical resistance value, and viewing the overdamped and underdamped...
  6. bibo_dvd

    Engineering Troubleshooting Circuit Analysis: How to Convert Current to Voltage Sources?

    hello guys i have been trying to solve this problem for a long time but i couldn't so i need your help.. iam trying to analyze the circuit using mesh analysis so i converted the current so to voltage source E=2*10=20V i don't know how to redraw the circuit taking this shape...
  7. D

    Engineering Plotting Diode Point-Contact with PSPICE for Circuit Analysis

    Hello i need to show with pspice plot the point-contact of diode. this is the circuit and the values i need: the right solution should look like this plot but this is the plot i see thx in advance!
  8. E

    Engineering Determining Voltage Across a Current Source in a Circuit Analysis Problem

    Homework Statement The problem statement is in the Attached Image...To find the Voltage "V" Homework Equations I tried aplying Thevenin theorem here...so Calculated Rth looking into the circuit with Voltage shorted and current sources opened. The Attempt at a Solution by...
  9. Jarvis323

    Engineering Understanding VCCS Circuit Analysis: Solving for Vo in terms of Vi

    I solved for Vo in terms of Vi and I get the negative of the correct answer according to the book. Someone told me that the TA set the node to the left of Vo = to -Vo, and this explains why my answer is the negative, but I don't understand why the node adjacent to Vo is -Vo instead of just Vo.
  10. C

    Engineering Circuit Analysis: Problem 4 - Obtain Current Through Galvanometer

    Homework Statement problem---4 (5 marks) Obtain the current through the Galvanometer G, having a resistance of 14Ω, in the Wheatstone bridge shown in Fig-4 Homework Equations i know the delta-Y transformation and applied it, i found out the R (eq) to be 32.4675ohm The Attempt at a Solution...
  11. V

    Solve function for Supernode Circuit Analysis

    I am using a TI-89 Titanium ROM Version 3.10 I can use solve() readily for N equations and N unknowns, however: I am trying to use the solve() function for Nodal Analysis with a Supernode As you may recall, this means more equations than variables: For example: (this is...
  12. C

    Engineering Circuit Analysis: Find R1 & R2 for 2.5V & 1 or 5 mA

    Homework Statement Picture of circuit is posted in the Screen Shot.1. Analysis: Both batteries are 5V. Find the values of R1 and R2 that will give an output voltage of 2.5, and a supply current of 1 mA. Then find the values that will give the correct output voltage with a supply current of 5...
  13. L

    Electrical Circuit Analysis vs General Physics w/ Calculus

    Hi. So, currently I'm a senior in high school taking classes at the community college (my high school is paying for them) and I am having trouble deciding between these two courses. I learned that General Physics w/ Calculus doesn't actually have that much calculus, and I already learned a...
  14. M

    Engineering DC Circuit Analysis with a Potentiometer

    I've been able to get all of the problems up to this point, but I have never seen a problem like this before, so here it goes: 9. Below is shown a simple resistive current source. The resistive load is represented by a 10 kΩ potentiometer. What is the current through the resistive load over...
  15. B

    Engineering Solve AC Circuit Analysis: Calculate Current, Real & Reactive Power

    Homework Statement Two nodes in a network are connected by a line with an impedance of 0.5 + 1.2j Ω. The voltage at the sending end is 33KV and at the receiving end is 32.5 KV with a lag of 1.5° compared to the sending end.. Calculate the current in the line and the real and reactive power...
  16. ShreyasR

    Engineering Circuit analysis consisting of an ideal diode.

    Homework Statement Find the voltage Vo for the following circuit. Consider the diodes to be ideal. Homework Equations When a diode is forward biased, Diode resistance = 0Ω (Short circuited) When a diode is reverse biased, Diode resistance is infinite (Open circuit) Ohm's Law: V...
  17. Z

    Engineering DE's in circuit analysis question

    The question that I'm having trouble with involves an RC circuit with a wire down the middle and two switches, I've attached a picture of it. There are two parts to the question and it's the second part of it I'm having trouble understanding but I'll put in the first one for context anyway...
  18. N

    How to use Multisim in AC circuit analysis?

    I'm trying to use single ac frequency analysis to measure voltage, current, impedance and phases stuff... But the current result displayed seem like decreased by 100 times?? this is my multisim file https://www.filesanywhere.com/fs/v.aspx?v=8b6a6b8e5c67757ab298
  19. S

    Engineering Circuit analysis with diodes and multiple current/voltage sources

    Homework Statement This isn't a homework question, just one I can't get the correct answer to. The circuit diagram is attached, and I need to find the voltage at V. The Attempt at a Solution Assume the voltage drop across each diode is 0.6V. Let V_5 be the voltage drop across the current...
  20. F

    Series-Parallel RC Circuit Analysis

    I'm having a hard time understanding and solving problems in moderately complex RC circuits... Please Help. You don't have to solve right up to the numerical value, that is not my priority, Rather If you could just explain how to begin and process through the question, It would be best...
  21. F

    Series-Parallel RC Circuit Analysis

    I'm having a hard time understanding and solving problems in moderately complex RC circuits... Please Help. You don't have to solve right up to the numerical value, that is not my priority, Rather If you could just explain how to begin and process through the question, It would be best...
  22. Q

    Why Is My Thevenin Resistance Calculation Different from the Textbook's?

    Homework Statement We have the circuit.http://i.imgur.com/X4IYi4j.jpg Find the equivalent thevenin resistance ..the result in my book is 8 ohm but I alway get 8/6 ..how so? Homework Equations Thevenin Teorem The Attempt at a Solution 1/Re=1/4+1/2 and so Re=8/6 ..
  23. T

    Engineering Introductory lvl circuit analysis problem

    Homework Statement Your factory is building RC low-pass filters using 10-6 F capacitors and 1k Ohm resistors. Suddenly the worldwide supply of capacitors dries up and you now have to build filters with the same electrical characteristics but you have to use inductors and resistors rather...
  24. T

    How Do Textbooks Bridge Circuit Theory and Electromagnetic Theory?

    I'm in EE and I've taken a fair bit of both circuit theory and EM theory, but I've always struggled a little bit with connecting the two. I think my main issue is that textbooks are usually very clear about how they've defined resistance, capacitance and inductance, but then they're not so clear...
  25. C

    Engineering Nodal Circuit Analysis using KCL

    Homework Statement I(a)= 11A, I(b)= 2.5A, I(c)= 3A. Apply KCL at node X to find I(x). This question seems really simple as it tells me what to do and where to do it, but am I missing something or not remembering to apply some concept? The Attempt at a Solution My attempt: I...
  26. Q

    Circuit analysis is this correct?

    Homework Statement We have the problem in the figure where E1= 9 V,E3= 5 V,E8=-5 V,J5= 3 A,J7=-1 A. R1= 8 Ohm,R2= 6 Ohm,R3= 6 Ohm,R4=7 Ohm, R6= 5 Ohm, R8= 1 ohm. Homework Equations I have to find the currents and the potential in the elements using KVL and KCL. The Attempt at a...
  27. Q

    Circuit analysis is this correct?

    Homework Statement We have the problem in the figure.I have to find the potential across 12 Ohm using nod potential method. Homework Equations Nod potential method,KVL. The Attempt at a Solution I write the potential for the nod a and I have (Va-Vb)/4 + Va/2= 2A (1) I write...
  28. Q

    Circuit Analysis: Solving for i Using Nodal Potential Method

    Homework Statement We have the circuit in the picture.I have to find i using potential nod method. Homework Equations Not potential method. The Attempt at a Solution If you notice it in the picture,there are four nods.I wrote the KCl for each nod,and then based on this I wrote...
  29. K

    Engineering Circuit Analysis via Laplace Transforms :yuck:

    Hi there, I have my final in my circuit analysis class tomorrow morning(at a community college, it feels like two semesters worth of content was covered in 18 weeks). Last week, the teacher went over LaPlace Transform analysis rather quickly, and then onto basic digital logic. I do not...
  30. Q

    Circuit analysis is this correct?

    Homework Statement We have the the circuit in the figure. Homework Equations I have to find I2. KVL,KCL. The Attempt at a Solution I apply KVL in the "left " part of the circuit and I have -42 V+ 2I1 +8I2=0 .(I 1 is the current through 2 Ohm).I apply KCL in the nod between R1 R3...
  31. Q

    How to solve circuit analysis problems with multiple loops?

    I have two problems and as you have seen I've been posting some exercises like this lately because I have 150 exercises to solve and I can't solve only a FEW of them 1. Homework Statement For the first one :We have the circuit in the figure.We have to find i.If its not clear,the current on...
  32. A

    Circuit Analysis - Laplace notation

    Homework Statement The circuit below uses ideal components and disguises itself as a second order system when in fact it is really two first order systems. Prior to t=0 switch S is open. Then suddenly at t=0 switch S is closed. Find the peak output voltage V_{0max}, and the time taken for...
  33. Q

    How Do You Analyze a Circuit with a Dependent Voltage Source?

    Homework Statement We have the circuit in the figure. http://oi40.tinypic.com/30kgl78.jpg.I have to find i and v1. Homework Equations Current division,KCL.KVL. The Attempt at a Solution I haven't seen any circuit like this. How to relate the left part of the circuit with the...
  34. E

    Engineering Discover the Fastest Way to Analyze Electrical Circuits

    Hello guys! I'm studying Electrical Circuits right now and come to this particular circuit where I need to find the current I, take a look: I'm able to find it, it is not hard at all. But what I would like to know are these two things: 1. What do you think is the fastest way to do it...
  35. Q

    Electric circuit analysis problem help?

    We have the circuit that I have attached in the figure.I have to find i1 i2 and V. SO I firt find i1. I find the equivalent resistance ( I am not writing it all here because it takes too long) and Re=10 Ohm.So i1 =V/Re=10 A. I thought that to find i2 and V I had to use the current division...
  36. D

    Why is T2 removed in low signal circuit analysis?

    I can't understand why you can remove T2 from this circuit when you make the low signal analysis. Can anybody explain me please ? https://www.physicsforums.com/attachment.php?attachmentid=57825&stc=1&d=1365838694
  37. Q

    Very very very short question circuit analysis please?

    I am solving a VERY complicated exercise and I have this part that I don't understand.The image posted is a very big simplification of a part of the exercise.I have to find the potential between A and B.My question : Are the 15 Volt and the 13 Volt in the picture involved in the calculation? I...
  38. N

    Engineering Help with intro circuit analysis problem Thevenin and max power prob

    Problem #1: What i did so far was I source transformed the left side with the Io and 4Ω into a voltage of 4Io. Then i did mesh analysis, io and i2. the eq'ns i got are 4vx - 2I2 - 2Io = 0 10i2 - vx - 2io = 0 IM not sure if this is right but does i2 = vx/4?? because of I = V/R? I worked...
  39. R

    Simple circuit analysis w/ voltage sources - MasteringPhysics wrong?

    Homework Statement We are given a simple circuit with 4 resistors, a known voltage source, and an unknown voltage source. The photo is below in my solution attempt.Homework Equations V=IR, R(parallel)=(1/R1+1/R2)^-1The Attempt at a Solution I found the voltage drop over the given resistor, then...
  40. N

    Check my work please? Circuit analysis, resistors in parallel, help

    Can someone check my work for me please? I'm pretty sure i made a mistake with the sign convention but I'm not sure which sources are supposed to be negative. help! Problem: http://imageshack.us/a/img201/339/circuitzz.png My solution: http://imageshack.us/a/img191/8049/circuitz.png...
  41. M

    Engineering Laplace Step Response Circuit Analysis

    Homework Statement Shown in attachment Homework Equations The Attempt at a Solution I'm trying to analyze the circuit in the attached picture. This is a step response with a 3V input or 3u(t). What I've done so far is: 1. convert all of the components to the s-domain. R = R, L = sL, C =...
  42. N

    Intro to circuit analysis, Solve all the loops in this current? help

    I was able to solve this pretty easily using mesh analysis, but what other ways can you use to solve this circuit? http://imageshack.us/photo/my-images/259/circuita.png/
  43. I

    Engineering Designing a circuit (basic electric circuit analysis)

    Homework Statement Design a dc circuit utilizing a 15V voltage battery to provide the following node voltages: +10V, +5V, and -5V w.r.t. a circuit ground node. Select your resistors such that the maximum power demand on the battery does not exceed 1mA. The attempt at a solution I've...
  44. S

    Engineering Circuit Analysis using KVL and KCL

    Homework Statement All variables are given by the circuit unless otherwise stated a) Derive an expression for the ratio (Vo/Vs) Homework Equations KCL and KVL equations The Attempt at a Solution Rs1=2.55kΩ -Vs+ .05Vo +(2.5kΩ/2.55kΩ)Vp = 0 where, Vs = .05Vo +...
  45. K

    Engineering Lumped circuit analysis dealing with electromagnetic propagation in silicon

    Homework Statement One of the conditions that we must obtain for us to use the lumped circuit abstraction is that the timescale of interest in analysis of the circuit must be greater than the speed of electromagnetic propagation. What was discussed in class was how much greater. The answer...
  46. E

    Engineering In circuit analysis, is current through wires defined?

    Homework Statement This is not a homework problem, but related to my circuits class. In the typical electrical engineering simplification, the resistance of wires in the circuit is taken to be 0 Ω. Also, the potential difference between two points along the same wire is 0 Volts. Does...
  47. H

    Circuit analysis potential difference

    Homework Statement What is the Potential difference between X and Y ? Homework Equations KVL and KCL The Attempt at a Solution I am confused about the two possible answers : 1. 9V (From general concepts) 2. 3V (after applying the KVL and KCL) I think the 2nd answer...
  48. N

    How Do You Apply Series and Parallel Rules in Circuit Analysis?

    Forewarning, the following is a simple grade 11 circuit analysis question that may be quite simple material for others on this thread. I would appreciate any assistance in determininghow this problem may be tackled. Homework Statement Homework Equations Series: VT=V1+V2+V3 IT=I1=I2=I3...
  49. T

    Electric Circuit Analysis: Calculating power absorbed/supplied by each element

    Once again, my textbook seems to do a poor job of explaining another concept just like I commented earlier here. Anyways, here is the relevant part of the textbook: http://www.mediafire.com/view/?cw5t2wr9vqqprnv To calculate p4 in example 1.7, voltage of 8V is multiplied by a current of -0.2I...
  50. T

    Electric Circuit Analysis: How to find the sign for power?

    My textbook does a very poor job of explaining how to assign signs to power: http://www.mediafire.com/view/?e0xr8j41tokujx6 It goes on to explain passive sign convention but it never explains active sign convention. Also, shouldn't the sign for power depend on voltage and current since power is...
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