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. VSayantan

    Current through an Ammeter in an Electric Circuit

    Homework Statement [/B] It is required to find the current through the ammeter, marked A, in the above figure.Homework Equations ##V=iR##The Attempt at a Solution I've redrawn the circuit as follows - But don't know how to obtain the value ##i_3##
  2. G

    KCL with phasors: how to proceed knowing effective values

    Homework Statement I have the following problem. Consider a circuit node where 3 sinusoidal currents with the same frequency converge, i1 i2 and i3. Knowing that the effective values of i1 and i2 are I1ef=1A and I2ef=2A. What can we say about I3ef: Options: $$(a)1A \leq I_{3ef} \leq 3A$$...
  3. P

    Need to Find the Total Resistance

    Given the circuit, I am supposed to find the total resistance, but I am unsure of what to do without having a voltage or current source with an internal resistor.
  4. G

    How do you find the current going through a weird circuit?

    Homework Statement Homework Equations at point C: i2 - i3 - i4 i2 = i3 + i4[/B] The Attempt at a Solution I labeled all the currents going through each resistor in the picture[/B] for loop ABC: 2000i1 = 3000i2 + 4000i3 for loop BDC: 3000i5 = 2000i4 + 4000i3 at point C: i2 - i3 - i4 i2...
  5. mkematt96

    Engineering Help finding error in my Circuit Analysis

    Homework Statement Homework EquationsThe Attempt at a Solution My values for i1,i2,and i3 were: -.005179,-.002857 and .004857. When I ran the same circuit through LT Spice the values they gave me were .00059081,.000809628, and .00119037. Where did I make my error? * as a side not I...
  6. anorlunda

    Insights The What and Why of Circuit Analysis Assumptions - Comments

    Greg Bernhardt submitted a new PF Insights post The What and Why of Circuit Analysis Assumptions Continue reading the Original PF Insights Post.
  7. Jayalk97

    Engineering Underdamped Parallel RLC Circuit

    Hey guys, so I'm having trouble with this circuit analysis question. I need to find voltage across the capacitor as a function of time. I nearly finished analyzing but I'm having trouble solving for the initial value constants in the voltage equation. So first I used KCL to create the equation...
  8. mkematt96

    Solve Using Method of Node Voltages

    Homework Statement [/B] Homework Equations This problem was from a practice exam. I know what V1 and V2 should be but can't get my answer to match. V1 should be -3.214 V and V2 should be -12.214 V The Attempt at a Solution See attached picture for my work. [/B]
  9. G

    3 resistors in parallel: how to get there

    Homework Statement 2. Homework Equations [/B] Hi! So I was given the following circuit with R=15k I was asked to calculate the equivalent resistance between A and B. The Attempt at a Solution [/B] According to my professor this circuit is equivalent to a circuit with three resistors in...
  10. G

    Arbitrary current with mesh analysis

    Given the circuit in the diagram I was wondering would I be able to make ib equal to the mesh i3. I have the equation for my Super Mesh at i1 and i3 which is: -25+30i3+5Va+20(i3-i2)+10(i1-i2)=0 (1). The mesh i2 is equal to -2A (2). subbing (2) into (1) gives: -25+50i3+5Va-30i2+10i1=0 (3)...
  11. S

    Ideal conditions in which circuit analysis is done

    What are the ideal conditions in which circuit analysis or analysis of an electrical system is done?I know that the air friction,friction between materials is ignored in ideal systems, such as for ohms law applications.What else is ignored in analysis of ideal electrical systems?
  12. T

    Engineering Solving Circuit Diagram Homework - Test Prep Tips

    Homework Statement [/B] A screenshot with everything given Homework Equations No idea The Attempt at a Solution No idea I'm not sure how to solve this or where to look for a solution. I was given this yesterday and have a test tomorrow. The professor has not gone over this at anytime...
  13. O

    Derive The Transfer Function from First Principles

    All, I need help deriving the Transfer Function of this circuit from first principles. http://i66.tinypic.com/24v3z9s.jpg
  14. G

    Engineering DC circuit analysis: conceptual mistake?

    Homework Statement Homework Equations[/B] I have a circuit that consists on 3 components in parallel: a current source Ia, a resistor R and a capacitor C. Ia is directed upwards, while the currents through the capacitor and the resistor are both directed downwards. Select the correct option in...
  15. E

    Can this circuit be solved? Please explain

    See the attached image. This circuit seems simple enough, but the fact that the voltage drop across each of the resistors is not the same means that equivalent resistance methods cannot be applied. Is more information required? Thanks for your help!
  16. F

    Complex Capacitor Circuit (for me)

    Homework Statement 1. V for C1 2. Let's Say "C" is Resistor then C1 = R1 etc. how to get Eq Resistance for this Circuit ?[/B]Homework Equations Faraday's Law, Kirchoff Law The Attempt at a Solution [/B] for no 1 :I just want to make sure. point A is transfering negative charge to C2 and...
  17. Likith D

    Does Adjusting Potentiometer Resistance Affect Volume in Amplification Circuits?

    The above is a circuit i found on the net regarding amplification of volume. I needed to know if increasing the potentiometer resistance (between "cold" and "wiper"; terminal 1 and 2?) in the circuit would increase "volume" Also, i could use a potentiometer resistance ( between "cold" and...
  18. D

    V2 of two symmetrical T attenuator pads in cascade

    Homework Statement http://imgur.com/qBXvrGz Above is a sketch of the circuit, a two stage symmetrical attenuator consisting of two symmetrical T attenuator pads connected in cascade, with the values that I have worked out for the resistors. The reduction is 15dB in the first stage, and 8dB in...
  19. D

    Electronics - Have I found the transient current correctly?

    Homework Statement A step voltage of 120v is applied to a series CR circuit. C = (4x10^(-6))F R = (20x10^(3))Ω When the capacitor is fully charged the supply voltage is removed. Using KVL and Laplace transforms obtain an equation for the transient circuit current, given when t = 0, the voltage...
  20. Vanessa Avila

    (LC Circuit) Finding cap charge after connecting to inductor

    Homework Statement A capacitor with a capacitance of C = 5.95×10−5 F is charged by connecting it to a 12.0 −V battery. The capacitor is then disconnected from the battery and connected across an inductor with an inductance of L = 1.50 H . What is the charge on the capacitor after a time...
  21. Cocoleia

    Laplace transforms in circuit analysis, finding missing values

    Homework Statement The Attempt at a Solution At this point, usually I would replace the values and sometimes separate into partial fractions, and then take the inverse Laplace transformation. So I know that the inverse Laplace needs to give me 6+12e^-2t. I am given the answers in my...
  22. Cocoleia

    Using Laplace to solve circuit analysis

    Homework Statement The Attempt at a Solution As you can see, the answer is given in the problem. I have the 0.8t par right but somewhere along the way I messed up. I'm not really to sure about how to solve these types of problems using Laplace. Is there a general procedure that I should be...
  23. D

    Engineering Simple DC Circuit Analysis with Transistor

    Homework Statement Homework Equations The Attempt at a Solution All loops are clockwise; KVL Loop around 1V, 120kOhm and VBE (I1 is assigned to the loop): -1V + 120kOhm * I1 + VBE = 0 I1 = IB = 0.3V / 120kOhm = 2.5 * 10-6 A; Loop around 10kOhm, vCE (I2 is assigned to the loop); KVL...
  24. stephen8686

    B VIR Chart for Circuit Analysis: A Quicker & Intuitive Alternative to Loop Rule

    Hello guys, I'm reviewing for the AP physics C exam and in one of my review books I came across this trick called a VIR chart for circuit analysis. It's a sort of weird alternative to the usual Loop Rule. If you haven't heard of it before here it is...
  25. Vanessa Avila

    Finding the current through the battery

    Homework Statement I am confused what to do but I have to find the current through the battery: Homework Equations V=IR The Attempt at a Solution I decided to find the equivalent resistance and do V/R = I using the 14V, but I believe my Req is wrong. What is throwing me off is the...
  26. The_Inventor

    Circuit Board Design: Basics of Designing a PCB

    My background is in physics so I have a very basic understanding of circuit design. I was just wondering, If someone were to design a printed circuit board (from scratch) how do they know that it will function the way it should? and also how do they know that the printed circuit board will...
  27. clamatoman

    Solving for Imax and Energy in an LC Circuit: Homework Help

    Homework Statement 4700uF Capacitor is initially charged to 9.0V, then the voltage source is removed and the capacitor is connected across a 1.50H inductor. Solve for: Energy of the Circuit, Imax, and Time after Circuit connected whed Energy of the capacitor =Energy of the inductor Homework...
  28. peroAlex

    Engineering RL Circuit Power Computation: What Am I Missing in My Solution?

    I'm having some problems understanding why my computation deviates from solutions. I thank in advance to anyone who can give me some tips where I've gone wrong. Homework Statement Compute real power on resistors ## R_1 ## and ## R_2 ## and reactive power on inductor ## L ##. Circuit is powered...
  29. solour

    Alternating RLC circuit with an additional capacitor

    Homework Statement http://imgur.com/a/TOUjV part b, specifically finding the maximum charge for C1. The question that boggles me is whether Imax changes on the left side of the circuit, after the switch closes. Homework Equations V=IR Xc = 1/(wC) XL = wL The Attempt at a Solution I was able...
  30. Adriano25

    Calculating Internal Resistance: Methods A and B

    Homework Statement [/B] Calculate the internal resistance of V & A based on methods A & B below: Method A Voltmeter = 1.46 V Ammeter = 0.24 A E (emf of battery) = 1.48 V Method B Voltmeter = 1.48 V Ammeter = 0.24 A E (emf of battery) = 1.48 VHomework Equations Ohm's Law: V = I*R The...
  31. Asmaa Mohammad

    What Is the Maximum Induced EMF in the Inductor?

    Homework Statement A generator consists of 500 turns each of surface area 7/11 m² . It rotates at rate of 50 revolutions per second (f =50 Hz), in a field of magnetic flux density of 5*10^-4 T, its terminals were connected in series with a capacitor (Xc=110Ω), an inductor (Xl=80Ω) and a...
  32. B

    KCL Problem with Dependant sources

    Homework Statement I'm trying to find the voltage drop V1 of the following circuit, assuming Vin=1v, and for the life of me can't seem to get the right answer. Homework Equations KCL, Ohm's law The Attempt at a Solution I basically tried to use KCL at the top node, Vin/2+2V1 = V1/3 +...
  33. donaldparida

    B Are the second and third circuits same as the first one?

    It seems at first sight of the first circuit that all the resistors of resistance r are connected in parallel and i have thus simplified it to the second circuit. But then on numbering the nodes and redrawing the circuit i got the third circuit. I got the same equivalent resistance for all the...
  34. TheBigDig

    Calculating Node Voltage using Nodal Analysis

    1. Homework Statement The circuit is driven by a voltage source, Vs(t)= 8.2 cos(1.8 t − 0.25 )V . The circuit elements are given as follows. G1= 5 S,G2= 7.6 S,G3=3.8 S (Gi is the conductance of corresponding resistor Ri) L1= 20 H,C1= 5×10−2 F If we select Node 4 as the reference node...
  35. TheBigDig

    Calculating the average power supplied by a source

    1. For the circuit shown in (Figure 1) , where V= 2.8 cos(2 t+ 0.3 ) , R= 8 Ω and C= 4×10−2 F , find the average power supplied by the source, Ps and the average power absorbed by the resistor PR .2. p (t) = v(t)i(t) = VmIm cos (ωt + θv) cos (ωt + θi) PR = (1/2)(V2m/R)3. From the...
  36. Schaus

    Voltage in a Circuit: Find Vx with 2A and 6Ω

    Homework Statement Determine the voltage, Vx, if 2A passes through the 6 Ω resistor. Homework Equations V = IR The Attempt at a Solution 1/Req=2/12Ω + 1/12Ω = 3/12Ω Reciprocal of 3/12Ω = 12/3 = 4 Ω I=2A R=6 Ω V = IR V = (2A)(6 Ω) V = 12V Total resistance is 4 Ω + 3 Ω + 2 Ω = 9 Ω The...
  37. donaldparida

    Will any charge flow through the circuit?

    https://drive.google.com/open?id=0B3IenBvKWb4PZW9rRWg4cXptT2c I had to find the resistance of this circuit between A and B. My teacher said that since the blank wires have zero resistance, the potential difference across the ends of the blank wire is zero(according to v = ir) and thus 1,4 are...
  38. adamaero

    Engineering Analog electronics (BJT circuit analysis)

    Homework Statement For beta = 100 and assuming ro is very large, what is the DC voltage at the collector? Homework Equations IB = IE(β+1) IC = β*IB The Attempt at a Solution Since IE = 0.5mA, IB = 0.0505 A Then, IC = 5.05 A (which doesn't feel right) VC is the same potential across the 30kΩ...
  39. A

    Engineering ECG Circuit Analysis: Calculating Contribution of Eint to Vout

    What is the contribution of Eint to the output voltage Vout? Homework EquationsThe Attempt at a Solution To calculate the contribution of Eint, I removed the other two voltage sources. Then, I divided them into three potential dividers, giving me: Vbody= (ZC2/ZC2+ZC1) x Eint...
  40. E

    Engineering OpAmp Circuit Analysis: Finding the Differential Equation for Vo

    Homework Statement Find the differential equation for Vo Homework Equations KCL The Attempt at a Solution At node v1: ##\frac{V_1-V_{in}}{R_1}+\frac{V_1-V_p}{R_2}+C_2(\dot{V_1}-\dot{V_2})=0## At node vp: ##C_1\dot{V_P}+\frac{V_P-V_1}{R_2}=0## At node vn...
  41. whatphysics

    Need help in step response circuit diagram

    This isn't a homework question! I posted the question for context purpose. So I understand that at t>0 the switch moves to b. Hence the first circuit diagram (pictured) I understand. However for the 2nd circuit diagram (picture 2) when asked to transform to s domain. Why does this answer...
  42. whatphysics

    How do you work out simultaneous eqns w/ complex numbers & phasor

    I'm having trouble figuring out to get the answers from the 2 equations. The phasors and complex numbers confuse me. Do I need to change the phasor form? How do I go about doing this thanks! (Not homework question I am trying to figure this for my exam!)
  43. gmm

    Engineering Circuit Analysis with Laplace Transforms

    Homework Statement Homework Equations V=IR All of them actually The Attempt at a Solution So I Started off by transforming the voltage source into the 's' domain vs(s) = (4/s) -(4/s)*e-.5t I know the initial conditions are zero, in other words at t=0, the voltage and currents at the...
  44. D

    Beginner Question About Series Parallel

    How exactly do you tell if two elements are in series or parallel? I know that if two elements share two of the same extraordinary nodes then they are in parallel: But in this example I do not see that. I know for certain that the answer for Rt is: [ ( (R1 || R2) + R3) || R4 ] + R5
  45. Vincci

    Number Guessing circuit -- I in creating this circuit

    I need help in creating this circuit. It was given as my final year project for my foundation in electrical and electronic engineering by my lecturer. Every component seems to work perfectly fine especially when it is tested in sub circuits. The problem arises when I try to simulate the whole...
  46. E

    How to make this circuit easier?

    Homework Statement I need to find voltages and currents in the following circuit, using Kirchoff laws. The purpose is not to gain knowledge in electricity, but to write a program that solves a system of equations using Gauss elimination method. I think I wrote correct program, but I also need...
  47. E

    Circuit Analysis of IR transmitter/receiver

    Hi everyone, I am a complete beginner when it comes to circuit analysis that involves anything more than a few resistors and capacitors. Currently, I am working on a project that requires the transmission and reception of IR signals to control a motor. I know the requirements for the motor I...
  48. Captain1024

    SEPIC Converter Analysis: CCM Operation with VL1, VL2, IC1, and IC2 Expressions

    Homework Statement Find expressions for VL1, VL2, IC1, IC2 for each of the two intervals of a SEPIC converter under CCM operation. link: http://i.imgur.com/EY98QbC.png Homework EquationsThe Attempt at a Solution link: http://i.imgur.com/SskXRoC.jpg?1
  49. E

    Possible confusion regarding application of Kirchoff's Laws?

    Homework Statement Determine Currents ##I_{1}, I_{2}, I_{3}## Homework Equations Kirchoff's Rules: $$\sum_{i=1}^n I_{i} = 0$$ $$\sum_{i=1}^n V_{i} = 0$$The Attempt at a Solution Basically, I'm not sure if I'm applying the Loop Law correctly. For example, in Loop A, going clockwise from...
  50. sammyqw

    Find Vc(0): Node Analysis & Ohms Law

    Homework Statement find Vc(0) Homework Equations Node analysis , ohms law The Attempt at a Solution Hi, I'm trying to find Vc(0). I used node analysis but I'm stuck in eq 1. I'll appreciate if someone can give me some suggestions. Thanks
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