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. J

    Circuit analysis current source problem

    Homework Statement given the circuit shown, find V1. Homework EquationsThe Attempt at a Solution see image: am i right? Video says otherwise... I chose to use the superposition theorem here. help appreciated, regards, james.
  2. Gbox

    Voltage between two points of a circuit

    Homework Statement In the circuit the battery is ##10V## and each resistor is ##4\Omega## find the voltage on AB Homework Equations 1.KVL and KCL 2. ##V=IR## The Attempt at a Solution ##I_{1}=I_{2}+I_{3}## ##10-4I_{1}-4I_{1}-4I_{2}-4I_{1}=0\rightarrow 10-12I_{1}-4I_{2}=0##...
  3. J

    Circuit analysis -- Voltage question

    hello, i have a question regarding the way we represent information on circuit diagrams. The first is to do with representing output voltages: is V out always simply representing the voltage of whatever lies between/trapped between those two horizontal lines? Also, i see a lot of diagrams...
  4. DevonZA

    Engineering Circuit analysis - current dissipated and pot. difference

    Homework Statement Homework EquationsThe Attempt at a Solution 1. 2. i) Use mesh analysis to solve for circulating currents I1 and I2. ii) What is the current dissipated by resistor R1? iii) What is the potential difference across resistor R3? 3 i) . Loop ABEFA...
  5. R

    Engineering Circuits w/ Diodes: Understanding Magnitude & Frequency

    http://imgur.com/9Yhwya0 So for #1, would I approach this problem by first considering the positive power applied to the top, making the diode on the right opened, and thus vouput being 4volts. Then for the next part would the diode on the left be in reverse bias, thus opened, and the voutput...
  6. Gbox

    Calculating Current Using Thévenin's Theorem

    Homework Statement [/B] Find the current that flows through the ##8 \Omega## Homework Equations Thévenin's theorem The Attempt at a Solution the theorem says that I can replace all the circuit to a power source and a resistor connected in series. So first I need to connect all the power...
  7. Gbox

    Solve Circuit Analysis: Thevenin Theorem

    Homework Statement Homework Equations Thevenin theorem The Attempt at a Solution ##R_{60+180}=240## ##R_{80||240}=\frac{240*80}{240+80}=60## ##R_{total}=60+20=80## ##=\frac{480}{80000}=0.006A## How should I proceed?
  8. Gbox

    Grounded electric circuit analysis

    Homework Statement Find the voltage in A,B,C,D when the circuit is grounded at point A Homework Equations ##V=IR## ##\sum_{i=1}^{n}I_n=0## ##\sum_{i=1}^{n}v_n=0## The Attempt at a Solution I have managed to divide the current according to KCL, but I am not sure how should I approach...
  9. cnh1995

    Creating a GUI for AC Circuit Analysis with Intel Galileo and Arduino

    I have completed a small project of ac circuit analysis on intel galileo in arduino. I want to make a GUI now. How should I proceed? I know C and a little C++.
  10. whatisgoingon

    How can I use circuit analysis to prove RI = RSRP/(RS - RP)?

    Homework Statement I have to prove that RI = RSRP/(RS - RP) by circuit analysis. The Attempt at a Solution [/B] So I tried to create a system of equations to do this: For the first circuit using kirchhoffs rules: V-IA(RS + RI) = 0 [1] For the second circuit: V-IBRS - IPRP = 0...
  11. Arvind_CSMaster

    BotCan Kirchoff's Laws Be Applied to Non-Conservative Circuits?

    Why can't Kirchoff's Laws be applied to a non-conservative circuit?. I'll be looking forward to a good discussion.
  12. T

    Engineering Circuit Analysis (Equation) with Multiple Voltage Sources

    Homework Statement Derive the differential equation that relates the voltage (V) to the current (I) entering the circuit. Homework Equations Let: ic = C dV/dt = current traveling through the capacitor (C) ik = (V+Ek) / Rk = current traveling through the potassium (K) channel iNa = (V-ENa) /...
  13. thegreengineer

    Nodal analysis, choosing reference node confusion

    I know that when we have to identify the nodes for solving a circuit with nodal analysis we always have to designate a reference node (which will be the ground node) as a reference for measuring the others' voltages. However I was practicing this and I found this example on...
  14. thegreengineer

    Nodal analysis, choosing number of nodes confusion

    Good evening people. Recently I started taking the "electric network analysis" course in my school. We already saw the mesh analysis method for solving circuits. Now we are seeing the node analysis method. I understand that the first step for this method is finding the number of nodes (and one...
  15. J

    Setting up differential equations for voltage

    Let V1 be the voltage across C1 and V2 be the voltage across C2. I want to solve for V1 and V2 as a function of time. My idea was to use dV1/dt=I1/C1 and dV2/dt=I2/C2. Then using circuit rules i can express I1 and I2 as functions of V1 and V2 and substitute them into the previous diff eqs...
  16. F

    What is the Net Resistance in this Complex Resistor Problem?

    Hey there! I'm having some real trouble deciphering this complex resistor problem. I have heard of the Kirchhoff voltage and current rules and do know how to use them to solve some problems but I'm not sure how to apply them in this context, or if they are even used to solve this. As seen the...
  17. G

    Engineering DC circuit analysis using Reciprocity Theorem

    Homework Statement In the following circuit I need to find current I1 if the given parameters are E1=0V,E2=15V,E3=60V In the second case, given parameters are I2=100mA,I3=40mA,E1=30V,E2=E3=0V In both cases, R2=R3=R4=R5=300 ohm Homework Equations Using reciprocity theorem for DC circuits. The...
  18. D

    Do you know any book for Power Circuit Analysis?

    We have a simple book for power circuit analysis and it is so hard to pass(8-15 pass from 200+) the exams because it has not solved problems(problems are so simple) also our teacher is doing the lessons copy paste from his book I can't learn this lessons and i can't find course material. Is any...
  19. Bobby425

    How to find the voltage 'v' Specified in the network shown?

    Which method is used to find that voltage v?
  20. A

    Tapped Transformer With a Capacitor

    The question is the following: a) Determine all load voltages and currents b) Determine the resistance reflected into the primary. Answer a) R(l): 35V, 2.91A, X(cl): 15V, 1.5 A The answer to part (b) is apparently 34.5 Ohms. How did they arrive at these answers? I am not sure...
  21. R

    Best way to improve knowledge of electronics/circuit theory?

    Hi guys, I recently finished my Physics undergraduate degree, and will be starting my first job in September. My employers have asked me to improve my knowledge of electronics before I begin work. I would like to improve my ability to analyse and understand circuits, and also learn more about...
  22. GGGboat

    Engineering How to Design a BJT Analog Circuit with Specific Transfer Characteristics?

    Homework Statement hello, i need to design analog circuit that has a transfer curve as seen in the following image using resistors, capacitors,voltage, and BJT (with beta value of 100). the parameters are: A=75 f1= 21Hz f2=21 KHz M1=40 M2=-20 the circuit also need to have input resistance of...
  23. T

    Engineering Kirchhoff's Law & Circuit Analysis: Q&A

    Homework Statement Using Kirchhoff's current law, determine: 1) The nodal equations 2) The expression and solution for the inductor voltage 3) The expression and solution for the inductor current 4) Determine the initial and final inductor current Circuit diagram: Homework EquationsThe...
  24. sandeep agari

    Circuit Current: How to Calculate IA, IB, IC, ID

    hello, while making a circuit ( uploaded pic) ,the specifications of leds are 50mA/2V, i found the current ( ID )just before the leds to be around 180mA. i just want to know how to determine the currents in the circuit at various points( IA, IB , IC, ID). in general i want to know how to...
  25. chadsalt

    Engineering Electronics textbook recommendations to self-learn

    Hi all, I am starting an internship with Lockheed Martin on Tuesday, May 26. I have just been notified of my duties, which will involve resolving issues with hydrophones/transducers. I am looking for recommendations of good textbooks that I could refer to during this internship. I am a rising...
  26. S

    Engineering Analyzing Series and Parallel Circuits: Finding Voltages

    Homework Statement Hello, can you help with this problem. For the next circuit, determine the voltages Homework Equations I=V/RT RT=R1+R2+R3+...+Rn P=V^2/R V=V1=V2=V3 I=V/R GT=1/R1+1/R2+1/R3+...+1/Rn The Attempt at a Solution My background is that I only know a very few and I don´t know how to...
  27. D

    Circuit analysis and general study tips

    The more work I do in the field of EE, the more I realizing that my general circuit analysis skills are usually the root of my confusion and could use improvement. Even after putting on my break-a-big-problem-into-smaller-pieces hat, I still find myself confused about the relationships between...
  28. M

    Thevenin's Problem: Solve for Voltage, Current, Power

    Homework Statement Homework Equations V=IR P=I^2R maximum power when load resistance = thevenin's resistance The Attempt at a Solution I have been able to work out the new load resistance but none of the other values correctly.
  29. T

    Engineering Analyzing an Oscillator Circuit: Voltage and Current Dynamics

    I have the following circuit that I need to calculate the voltage across the capacitor as a function of time. Standard variables for the component values, voltage drops, currents, ect. You'll notice that the voltage (at the top right corner) oscillates at a frequency dependent on the...
  30. BarelyOtaku

    Engineering RC circuits, a step skipped in solution

    Homework Statement . [/B] This is problem 7.45 in Fundamental of Electric Circuit 5th edition. 2. Homework Equations First off, I want to go ahead and say that I don't need the solution I already solved it. I went ahead and used Nodal analysis when Vs = 30. I placed a node voltage right...
  31. J

    How Do Capacitors Behave in a DC Circuit?

    Homework Statement A 12V DC supply is connected in series to 2 capacitors, of 12 and 4 micro farads. A switch is in series also. The diagram shows the capacitors above the supply and the larger capacitance capacitor to the left. The names of the plates of the capacitors from left to right are...
  32. S

    Amplifier Circuit Advice -- AF/RF

    Not sure if this is the right place to post, but here we go, my first question: I've been searching around for a simple circuit for amplifying rf at around 7MHz, and went ahead and followed this guide, 2nd picture down, and built the amplifier. It works, even with some small resistor value...
  33. X

    Engineering Solving unkown impedance in circuit

    Homework Statement Homework Equations V=IZ The Attempt at a Solution So my plan is as follows: Find the current through the 1 ohm resistor, multiplying this by the combined impedance of the capacitor & 1 ohm resistor. Now I know the voltage across the unkown impedance Z. Subtract this...
  34. X

    Engineering Solving phasor circuit with unknown dep. current src

    Homework Statement Homework Equations V=IR The Attempt at a Solution I try to simplify the circuit by combining the capacitor and 2ohm resistor in parallel, Z = 1-j. Then I add the inductor to get Z = 1. Knowing the current across the resistor, 2(0d) I find the voltage across the 5 ohm...
  35. X

    Engineering Phasor Circuit Analysis Homework: KCL & Z Equations for Capacitors"

    Homework Statement (Note, my answer below is also wrong. I've attempted this problem for about 1 hour now and I can't figure it out.) Homework Equations KCL (Kirchoffs Current Law) Z for the capacitor, Z = 1/(jwC)[/B]The Attempt at a Solution I'm using KCL at V1 with the following...
  36. X

    Circuit analysis complex numbers

    Homework Statement I'm going crazy. I've done this problem nearly 20 times and keep getting the same answer. I've read my textbook so many times too! What am I doing wrong? Homework Equations Zcapacitor = 1/(jwC) Zinductor = jwL Zresistor = R The Attempt at a Solution Z for the...
  37. X

    How Does K1 Being Zero Affect the First Order Circuit Solution?

    Homework Statement We are given K1 = 0. So the answer should be in the form of V(x) = K2e^(-t/z)Homework Equations V=IR V(x) = K1 + K2e^(-t/z) V(infinity) = K1 V(0+) = K1 + K2 z = RC The Attempt at a Solution I draw the circuit for t = 0- and find the voltage across the capacitor. Vc(0-)...
  38. X

    Question about resistors (parallel and series)

    Here is a picture of a circuit: I have two questions: (1) Are all resistors connected in one of two ways? I.e., resistors can be connected in parallel and in series, but is it possible for them to be connected as NOT parllel and NOT series? For instance, the two circled resistors don't seem...
  39. I

    Can't tell if I made a chaotic circuit or if I broke the sim

    So, I was playing around with a couple of voltage multiplier circuits a few months ago, and while optimizing one design, I came up with a pretty neat (not to brag) way of converting a sine wave to a square wave by using transformers in a completely different way than normally. A little while...
  40. X

    Is electrical engineering just rote memorization? Or am I

    For instance, I was introduced to thevenin and norton theorems about 1-2 weeks ago and it seems like we're expected to rote memorize the algorithms on solving problems. There is no proof/logic explained in different circumstances. For instance, we're told what these theorems are and how they...
  41. X

    Determining Rth from a simple circuit

    Homework Statement Homework Equations V=IR[/B] From my textbook: If the circuit contains both independent and dependent sources, the open‐circuit terminals are shorted and the short‐circuit current between these terminals is determined. The ratio of the open‐circuit voltage to the...
  42. J

    Engineering Why Am I Struggling with Phasor Circuit Analysis?

    Do I have the right idea? I'm not getting what is in the solutions manual but it's been wrong on past chapter and I'm beyond frustration.
  43. D

    Resistor Network Circuit Analysis

    Could someone help me with number 1. I think I did it wrong. I attached the diagram with the labels. On the original one the resistors aren't labeled, but I separately labeled them on my diagram. 1. R1=1.0 ohms R2=3.0 ohms R3=5.0 ohms R4=12 ohms R5=2.0ohms R6=4.0 ohms R=0.2 ohms...
  44. ichabodgrant

    Engineering Understanding Op-Amp Circuit Analysis: Nodal Analysis vs. Basic Formulas

    Hi. I have moved on to the next question. There is something I am confused. The question wants us to express Rf in terms of R such that vo = -15vi. After doing the last task, I think I understand the flow of solving it. But here still exists a problem. My attempts and question are listed in...
  45. J

    Engineering Op-amp resister circuit analysis

    Homework Statement Given the ideal op-amp, determine the resistor R2 and the current I2 where Vin=500mV, Vout = 2.5 V, and R1=5kV. Homework Equations No current passes through op-amps, the op-amp tries to make V+ and V- equal. Ohm's law, voltage divider equation The Attempt at a Solution...
  46. ichabodgrant

    Engineering How can R1 and R3 be expressed in terms of R2 and R4 in an op-amp circuit?

    In the following circuit, compute the values of R1 and R3 in terms of R2 and R4, such that vo is always equal to v1 - 5v2.I have marked 3 nodes, A, B and C. v+ = v- as assumption for the op-amp. Consider node A. v- = v+ = v1 × (R2 / (R1+R2)) Consider node B and C. (v- - v2) / R3 = (vo - v-) /...
  47. K

    Engineering Circuit Analysis Homework Help: Parts A & C

    Homework Statement Need help on part a. and c. The Attempt at a Solution Part A Since Va = 4V then pin 2 and 3 also have 4v. Would that mean that Vin is = 4v as well? Im just confused how to find I1. Also I am not sure how to find Vc. Part C As for part c, I am having trouble with it...
  48. S

    Wheatstone bridge, only one R value known

    Problem statement, work done, and equations: I cannot figure how to get the other resistor values, seems like too few knowns A Wheatstone Bridge is often used in sensor circuits and other measurement circuits. The basic circuit is drawn below: In the circuit, Rs is the sensor and might be a...
  49. A

    Multiple Power Source Circuit Analysis

    Homework Statement Compute all the currents labeled using the mesh loop method. Homework Equations Parallel Resistors 1/Rt=1/R1+1/R2...+1/Ri Series Resistors R1+R2...+Ri The Attempt at a Solution My attempt at the kvl and kcl analysis, I think I did this wrong because I can't solve for...
  50. Q

    Find current using mesh analysis question?

    Homework Statement We have the circuit in the figure.I have to find Io. Homework Equations Mesh current analysis. The Attempt at a Solution The first mesh is i1 and the second one is i2. We have a supermesh here.Supermesh results when two meshes have a (dependent or independent)current...
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