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. G

    Circuit Analysis : Using Kirchoffs

    Homework Statement http://img202.imageshack.us/img202/939/95788682.jpg Find Vo Vo = -50V (given answer by my prof) Homework Equations KVL (Series) V=V1+V2 (Parallel) V=V1=V2 KCL Current toward the node = Current Away from the node V=IR The Attempt at a Solution i tried to solve for the i in...
  2. B

    Would someone kindy give me some tips for Circuit analysis?

    I know that mesh method can only be used in loops without inside loops. Kirchhoff's laws for few unknowns. And nodal analysis can be used for analyzing almost all circuits, right? But what to use for an easier solution? I know that it is dependent to what is given but I just want to have an...
  3. D

    Recomendations for Introductory Circuit Analysis Textbooks

    As the title states, I am looking for recomendations, and explanations as to why it was a good book. Some current suggestions I have had is by Robert L. Boylestad. Thanks in advance!
  4. B

    Engineering How Do You Apply Kirchhoff's and Ohm's Laws to Analyze Circuit Voltage?

    Homework Statement 1. Use Kirchoffs and Ohm's rule to find the voltage of vknot (to the far right of the picture) 2. show that your solution is consistent with the constraint that the total power supplied in the circuit equals the total power dissipated. (Picture of Circuit attached)...
  5. M

    Engineering Circuit analysis - proportionality

    Homework Statement Homework Equations First problem: Second problem: The Attempt at a Solution I assume it is acceptable to lump this section into the previous one, as I believe they go hand in hand in this case. My apologies if not. I am definitely a lot more lost in the second...
  6. F

    Engineering Circuit Analysis: Understand V2 & 3amp Equation

    Hello, I have tried really hard to understand this circuit but I just can't grasp it. I am trying to understand how V2 comes to 6 volts ie. where does the 3amp come from that is multiplied by the value of V2 to give 6 volts. It would help a lot if I could see the linear equation which gives 3...
  7. PainterGuy

    Simple circuit analysis using KVL

    Hi, :smile: Please have a see on this circuit diagram: http://img192.imageshack.us/img192/7726/meshkvl.jpg I used these equations: 1: I1 = I2 + I3 (Using KCL at junction e) 2: 6 - 4I2 + 4 - 2I2 = 0 (Using KVL around afeba) 3: 3 - 6I3 - 4 - 4I2 = 0 (Using KVL around dcbed) I2 = 2.8 A I1 = 4.5...
  8. P

    Engineering Circuit analysis - very nearly finished

    Homework Statement Find the value of N(1,2,3) in attached circuit Homework Equations The Attempt at a Solution I've found i(1,2,3,4) from mesh analysis as: i_1=1.44159mA,i_2=0.919142mA,i_3=0.396691mA,i_4=-0.08609047mA now I am having trouble finding N_2 and N_3 from this. Thanks for any help.
  9. M

    Engineering Circuit analysis - finding current

    I have to solve for i(t) in the following circuit: i am wondering what the best way to approach this problem is. does the loop current method work in this case if i define all the currents to be flowing clockwise? in other words, >> A = [3 -1 -2; -1 4 0; -2 0 2]; % matrix A >> b = [v1; -v2...
  10. PainterGuy

    Introductory Circuit Analysis for a beginner

    Hi everyone, :wink: I have a copy of this book: https://www.amazon.com/dp/013097417X/?tag=pfamazon01-20 I don't think it is a good book. Even some people on Amazon also note that. I am not very good in math and want to understand things from conceptual point of view. Some books use math...
  11. M

    Engineering Circuit Analysis: KVL/KCL Setup Help

    Can someone please tell me if i am setting up the KVL and KCL for the following circuit correctly? KVL: v0 = i1*R1 + i2*R2 v2 = v3 // v2 = i2*R2; v3 = i3*R3 KCL: i1 = i2 + i3 thanks in advance
  12. S

    Power system model circuit analysis

    Hello everyone, I am new here and I really really need someone's help. I am studying the operational issues that could arise when connecting a windfarm to the grid. I have drawn a circuit model and it is the one I will use for the study. I am stuck with the circuit analysis. I need to...
  13. C

    Engineering Understanding KVL and KCL for Circuit Analysis

    Homework Statement Basically, find Vab [PLAIN]http://carlodelmundo.com/hw/circuit.png Is this correct -- note: please tell me that my methodology is sound; DO NOT GIVE ME A NUMERICAL ANSWER. The problem asks for VAB. What's weird to me is that there is a potential across two...
  14. C

    Engineering How do I calculate Vc and i for an RC circuit with a closed switch?

    Homework Statement The switch in the following circuit has been opened for a very long time and then closes at t=0 (a) Calculate Vc(t) for t>0. (b) Calculate i(t) for t>0. Homework Equations The Attempt at a Solution Here is my attempt of the problem. I have not dealt with a...
  15. L

    Engineering Solve Circuit Analysis Homework: KVL, KCL, Ohm's Law

    Homework Statement [PLAIN]http://img121.imageshack.us/img121/7384/1037s.png Homework Equations KVL, KCL, Ohm's law, voltage divider The Attempt at a Solution The equivlent resistance of the circuit is 25ohms. Therefore the current flowing through i2 is 20volts/25ohms = 0.8A...
  16. B

    Engineering RC circuit analysis using oscilloscopes

    Homework Statement this was a practical examination given to us. [connected to CH1] |----(1.8k ohms)-----| |aaaaaaaaaaaaaaaaaa| |aaaaaaaaaaaaaaaaaa(unknown resistance) [these 2 unknowns are ch2] (~)aaaaaaaaaaaaaaa| |aaaaaaaaaaaaaaaaa(unknown capacitance)...
  17. N

    Engineering Rth of Norton's Theorem for circuit analysis

    Homework Statement I've deleted all current sources and shorted the voltage sources. http://img121.imageshack.us/img121/5064/62767285.png How would I reduce this circuit to an equivalent resistance? What's throwing me off is the location of b and the fact it is a broken wire. The Attempt at a...
  18. H

    Confusion with voltage polarities in circuit analysis.

    I am always confused with voltage polarities in circuit analysis.I can't really explain what I am confused about its just that i use intution rather than using a set rule to find voltage across some element bunch of elements.Most of the time the confusion is in applying KVL, and I am confused...
  19. G

    Engineering Help me to understand basic circuit analysis solution

    Homework Statement given in uploads. Homework Equations The Attempt at a Solution I just don't understand why they went [(12||6) + 2] I tried doing (12||8) and I ended up getting the wrong answer. Why do you have to add the 2k(ohms) to the effective resistance of the 12||6...
  20. C

    Electrical engineering circuit analysis

    Homework Statement Question 1: http://img690.imageshack.us/i/79806671.jpg/ Question 2: http://img833.imageshack.us/i/48920688.jpg/ Homework Equations V=IR, P=I^2R The Attempt at a Solution Answer to Question 1: http://img831.imageshack.us/i/imgmp.jpg/ Answers to...
  21. A

    Engineering Linear circuit analysis question

    Homework Statement Replace resistor R with a voltage source such that no power is absorbed by either resistor; draw the circuit, indicating the voltage polarity of the new source. Homework Equations Ohm's law, Power = IV = I^2 * RThe Attempt at a Solution I'm honestly not too sure how to...
  22. J

    Engineering Calculating Energy Expenditure in a Circuit Analysis Problem

    The power supplied by a certain battery is constant 6 W over the first 5 mins, zero for the following two minutes, a value that increases linearly from zero to 20 W during the next 10 minutes, and a power that linearly decreases 20 W to zero in the following 7 minutes. What is the total energy...
  23. A

    Where can I find a helpful reference for understanding circuit diagrams?

    Hey guys, just started a class in linear circuit analysis. I have never had any education on reading circuit diagrams (even basic ones), so could you guys recommend a nice reference? The book doesn't even help; it also assumes I've had some past experience.
  24. J

    Electrical Circuit Analysis: Understanding Current Flow and Direction

    I am currently working on a physics homework problem that is giving me some trouble. The problem involves circuit analysis. Here it is: How much current flows through the bottom wire shown below, and in which direction...
  25. D

    Circuit analysis in series vs. parallel

    I need to determine whether the resistors on this circuit are in series or in parallel. Here's my reasoning... They are not in series because the current going through each resistor is not equal: I1 \neq I4 \neq I5 * *This is assuming I've assigned current properly which I'm not sure I have...
  26. G

    Engineering Second Order Circuit Analysis - Mesh - Issue with DE Setup

    Hi, I am sure I have mistaken my DE setup or my initial conditions assumption. Homework Statement http://ivila.net/E8.png R1 will be the middle Resistor R2 the top one. Homework Equations i1' + R1/L i1 = R1/L i2 i2(R1+R2)*1/(R1) + 1/(R1*C)*integral(i2)=i1 The Attempt at a...
  27. James889

    Engineering How do I solve for node voltages in a circuit with complex resistances?

    Hi, I have the following circuit [PLAIN]http://img245.imageshack.us/img245/8193/upg553.png I need to solve for the node voltages V1 and V2. Im not sure how to deal with this when complex resistance are involved. Also, do you start by writing expressions for the mesh currents...
  28. B

    Circuit analysis - Potential differences of resistors

    Homework Statement R_1 = 70 \Omega, R_2 = 144 \Omega, R_3 = 237 \Omega, R_4 = 117 \Omega, R_5 = 246 \Omega; V_{ab}=43 V I am looking for the voltage of each resistor as well as the current passing through each one. Homework Equations Kirchoff's Voltage/Current Laws: The sum of any...
  29. H

    Engineering Solving Circuit Analysis Problem: Find V - Power of 5Ω Resistor is 20W

    Homework Statement Hello, I was hoping someone could walk me through the steps to solve this problem: The power absorbed by the 5Ω resistor is 20W. Find V http://img191.imageshack.us/img191/6411/14966985.jpg Homework Equations V= I x R P = V2/R The Attempt at a Solution I...
  30. A

    Engineering Circuit Analysis: Deriving Transient Expressions

    Homework Statement analytically derive the transient expressions for the following 1. the output voltage vot for t > 0 2. the power absorbed by each resistor and capacitor Homework Equations The Attempt at a Solution I'm not sure where to start. Don't i need to know what...
  31. I

    Engineering Circuit Analysis: Simple Problem

    Homework Statement We are given the following equations in my circuit analysis class. q(t) = 2 - 2e^{-100 \cdot t} Where I am told to find q(0) = ?, q(\infty) = ?, I(0) = ?, I(\infty) = ? q represents the number of coulombs in a charge of a circuit I believe? I represent...
  32. M

    Engineering First-order RL Circuit analysis

    Homework Statement Homework Equations I am not really sure which equations would be relevant since my question seems to be more so concepts instead of numbers, so forgive me please :( I am familiar with how to do just about all of this problem, I am simply baffled as to how I handle the...
  33. F

    Engineering Mesh Circuit Analysis: Determine Voltage Across R6

    Homework Statement Determine the Voltage across Resistor R6. Homework Equations KVLThe Attempt at a Solution I called the bottom left Loop I1, the bottom right I2 and the top I3. All currents are flowing clockwise. From there I set up my KVL expressions for each loop: -12 + 5600(I1-I3) +...
  34. G

    Circuit Analysis and resistance

    http://img41.imageshack.us/img41/7798/circuitanalysis.png Homework Statement (a) What is the equivalent resistance of the network of resistors in Figure 6.13? (b) What current exists in the 3.0 Ω resistor? R1=2ohms, R2=6ohms, R3=6ohms, R4=6ohms, R5=6ohms, R7=3ohms, V1=6V Homework...
  35. V

    AC Circuit Analysis with phasors- tutorials/video lectures?

    I'm having a bit of trouble understanding how phasors/complex numbers are used to solve circuits which include capacitor, inductor and resistor components. Has anyone come across video lectures/youtube tutorials/websites that provide comprehensive solutions to a whole bunch of...
  36. M

    Engineering Introductory circuit analysis - thevenin circuits

    Homework Statement Homework Equations Thevenin stuff, right? The Attempt at a Solution So, I tried to re-write everything and make it a bit easier to understand: I ended up getting Rth completely fine and everything, but I can't seem to get Eth. So from there, I...
  37. M

    Engineering Question regarding introductory circuit analysis

    Hello! I have been working on this problem for around 1.5 hours, and decided I simply need help. Homework Statement "Using branch-current analysis, find the magnitude and direction of the current through each resistor for the network. Homework Equations I tried using kirchhoffs...
  38. X

    Engineering Circuit Analysis Question: Find Req, i, Vx

    I had a simple circuit analysis question and the picture describes everything; I'll restate the questions just in case if you can't read it. Find the Req seen from nodes bc, which are the nodes above and below the potential source. Find the current, i. That is the current enters the...
  39. S

    Circuit analysis - finding resistance

    Does a part of current form cell E1 go through the cell with emf E2? or only through the resistor R? Similarly does current from E2 pass through E1?
  40. J

    Solving a Simple Circuit Analysis Homework Problem: Finding Voltage Drop

    Homework Statement I have a box which has two resistors in it, R1 and R2. The box has three terminals: a red, black, and white terminal. A voltage source of 10 V is connected across the red and black terminals. If I connect a voltmeter across the red and white terminals, what is the expected...
  41. J

    Engineering Simple Diode Circuit Analysis: Homework Help and Solutions

    Homework Statement Attached is the homework problem I'm having difficulty with. I need to sketch vout for the circuit, assuming the diode ON voltage is 0.6 V. I'm stuck at how to begin this problem. Homework Equations The Attempt at a Solution It's only the 2nd week of class so...
  42. I

    Engineering RCR (series-parallel) Circuit Analysis

    Homework Statement If the input AC voltage amplitude is Vo and the angular frequency w, find the impedance of the circuit below and the amplitude of the current that the generator provides. What is the behavior of the circuit at very low and at very high frequencies? This is a circuit with AC...
  43. C

    What are some suggestions for a good circuit analysis program?

    im currently using protel to draw circuit diagrams and it is fine for that. but, when trouble shooting a board, i'd like to have a schematic drawing program that would allow me to set my own input voltages and allow me to check the voltages at different nodes. the only components i need it to...
  44. T

    Engineering Are There Any Comprehensive Online Books for Circuit Analysis I?

    I want to know if there is any good reference online book for Circuit Analysis I ? I plan to buy another book for reference but if i can find an online book then why spend the money. :) Thanks
  45. S

    Circuit analysis self-tests/practice

    Hi all I was wondering if anyone knows of any good books or other resources that contain lots of circuits to practice analysis, beginning with the basics, ie Kirchoff, Norton, Thevinin, around first year BE(EE) level. Must contain answers too. Regards
  46. G

    Engineering Nodal Analysis Problem (Basic Circuit Analysis)

    Homework Statement Find v1 and v2 from the given picture. Homework Equations Ohm's law, V=IR Current Division The Attempt at a Solution I tried to use current division. The 6A source split into 2, giving 2A down the 8 ohm resistor and 4 amperes down the 4 ohm resistor. Since...
  47. G

    AC Circuit Analysis - Capacitor

    Homework Statement Calculate the magnitude and sign of i12 which will flow through a capacitor of 10microfarads when: v12 = +50V, and decreasing at a rate of 104V/s Homework Equations Vab=Q/C The Attempt at a Solution No idea where to even begin with this question I am affraid. :(
  48. C

    Engineering Circuit Analysis: Calculate Power Through Resistor

    i don't need help writing the c++ code, but i do need help calculating the power through the resistor. P=VI and P = I^2R aren't working, so I'm guessing it's got something to do with circuit analysis, which i haven't been taught yet, and that my c++ class hasn't gone over. ------2 ohms----...
  49. G

    Simple Circuit Analysis - 2 Questions

    Appologies for the amazing circuit diagrams in MS Word Homework Statement For the Circuit shown below, design the opamp circuit which will give an output of -25V For the cicruit shown, calculate Vs The Attempt at a Solution Ok, for the first one, I summed the...
  50. rootX

    Circuit Analysis: My Solution to Problem in Figure

    Problem and my attempt at the solution are in the figure below (red is my work): http://dl.getdropbox.com/u/364603/elec.png
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