What is Equivalent resistance: Definition and 209 Discussions

Practical capacitors and inductors as used in electric circuits are not ideal components with only capacitance or inductance. However, they can be treated, to a very good degree of approximation, as being ideal capacitors and inductors in series with a resistance; this resistance is defined as the equivalent series resistance (ESR). If not otherwise specified, the ESR is always an AC resistance, which means it is measured at specified frequencies, 100 kHz for switched-mode power supply components, 120 Hz for linear power-supply components, and at its self-resonant frequency for general-application components. Additionally, audio components may report a "Q factor", incorporating ESR among other things, at 1000 Hz.

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  1. R

    What is the Equivalent Resistance for this Homework Statement?

    Homework Statement [PLAIN]http://img502.imageshack.us/img502/6081/93069832.jpg
  2. A

    Find Equiv. Resistance of Circuit: R1, R2, R3, R4

    Homework Statement I'm just trying to find the equivalent resistance of this: http://sogacity.com/images/circuit.png Homework Equations Resistors in series add and resistors in parallel inversely add. The Attempt at a Solution I'm not even sure how to approach this. I guess I...
  3. T

    What is the equivalent resistance through circuit?

    Homework Statement uploaded image a) What is the equivalent resistance through circuit? (Answer is 1.638 ohms) B) what is the current through the 5ohm resistor? (Answer is 1.911 amps downward) The main part I am confuse about in part A) is what is in parallel and what part is in series...
  4. L

    Equivalent resistance of circuit

    Homework Statement Find the equivalent resistance between terminals A and B for this circuit: http://img716.imageshack.us/img716/1121/1035p.png [PLAIN]http://img716.imageshack.us/img716/1121/1035p.png Homework Equations I know how to add resistances in parralell and series...
  5. R

    Is This the Correct Method to Calculate the Equivalent Resistance?

    find R equivalent of the circuit i tried the following but not sure R1 R3 parallel R2 R4 parallel then both results above as series and at last the result from above as parallel with R5 please correct me if i am wrong
  6. S

    Electrical Engineering: Equivalent Resistance Problem

    Homework Statement ** note that the circuit resembles a 3-d square (the wires aren't "crossing over" each other In the problem, all circuits have resistance R If it helps, assume current i flows into a, and leaves through b and c We are asked to find the equivalent resistance...
  7. O

    Equivalent resistance across a circuit made of 12 resistors

    hey can anybody please tell me how to solve this circuit?? :confused: I tried this sum out but I can't understand which points are symmetrical and have same potential..or how the current is distributed
  8. T

    Calculating Equivalent Resistance in Coated Substrate Circuits

    Hello I have a question to ask you. Your help will be highly appreciated. Kindly refer to a scenario where a substrate material ‘B’ is coated both side with a coating material ‘A’. The whole thing is then connected to a voltage source. Here B is poorly conductive and A is highly conductive...
  9. S

    Equivalent Resistance: 20ohms - Solving with a Circuit

    Homework Statement This should be quite simple for most of you although I can't understand it. Circuit is attached below Homework Equations The Attempt at a Solution The answer is 20ohms, although I would have done R1+R3 + R4//R5 which would get 25ohms. The previous question was to find Rab...
  10. jegues

    Resistor pattern - Equivalent resistance

    Homework Statement See figure Homework Equations Rs = R1 + R2 Rp = (R1*R2)/(R1+R2) The Attempt at a Solution I tried completing one repitition of the pattern to see if I could figure out what the Req would be so: R + R in series on the end so 2R // R so 2/3R in series with R...
  11. S

    Equivalent Resistance between A and B

    When we are asked to find the equivalent resistance between A and B, i understand we are trying to find the Thevenin resistance between A and B, which is caused by what is in the black box. However if there is a resistor actually between A and B, do you add this to the Thévenin resistance...
  12. K

    What is the Equivalent Resistance in this Circuit?

    Homework Statement http://img265.imageshack.us/img265/9245/45050879.png" Homework Equations The Attempt at a Solution I really just don't know. I understand how equivalent resistance works, but I just don't get this question. Please ignore the marks I have on the page.
  13. A

    What is the Equivalent Resistance of Resistors in Series and Parallel?

    Homework Statement All resistors have the same value, 'R' Homework Equations I don't think mesh/loop analysis or nodal analysis is applicable here, I think I'm just having a hard time seeing how the series-parallel connections work.The Attempt at a Solution I know the top left two are in...
  14. F

    Equivalent resistance of a two pole

    Homework Statement 2. The attempt at a solution I would say Re = 6 ohm, but that can't be right.. So i really don't know how it could be something else. Any help in solving this problem would be apreciated :)
  15. Z

    Determine the equivalent resistance of the circuit

    Homework Statement a 3.0 ohm resistor an unkown resistor r and two ammeters a1 and a2 are connected with a 12 volt source ammeter a2 reads a current of 5.0 amperes 1) detemine the equivalent resistance of the circuit 2) caculate the current measure of ammeter a 1 3) caculate the...
  16. Z

    Calculate the equivalent resistance of the circuit

    Homework Statement a 50 ohm resistor, an unknown resistor R, a 120 volt source and an ammeter are connected in a compelete circuit. the ammeter reads 0.50 ampere 1)calculate the equivalent resistance of the circuit 2)determine the resistance of resistor r Homework Equations a =...
  17. M

    Equivalent Resistance in series circuit

    Homework Statement Three resistors with values of 7.0 Omega, 12 Omega, and 16 Omega are connected in series in a circuit with a 9.0 V battery. a) What is the total equivalent resistance? b) What is the current in each resistor? c) At what rate is energy delivered to the 16 Omega resistor...
  18. T

    What is the Equivalent Resistance between Points A and B?

    Homework Statement Find the equivalent resistance between points a and b in the figure Homework Equations 1/Req = 1/R1+1/R2... for parallel Req= R1+R2... for series The Attempt at a Solution 12.63 ohms
  19. T

    Finding equivalent resistance in complicated circuit

    Homework Statement Problem: What single, equivalent resistor could replace all of the resistors in this circuit? Given R1 = 4, R2 = 5, R3 = 14, R4 = 9 Homework Equations In series, R1 + R2... = Req Parallel, 1/R1 + 1/R2... = 1/Req The Attempt at a Solution I have tried...
  20. A

    Need Help in equivalent resistance for a circut

    Hi, I got a question in my exam ask for the equivalent resistance, The Question is: Find the equivalent resistance for this circuit using Kirchoff Rules I build the Image by circuit maker. http://lookpic.com/i/965/ud67CMW6.jpeg R1=2 Ohms R2=2 Ohms R3=2 Ohms R4=4 Ohms R5=1 Ohms i know that...
  21. A

    How to find the equivalent Resistance of these circuits

    Suppose that all resistors have a value of 100 ohm how to find the equivalent Resistance of these circuits, the number in these circuits indicate the areas for which we will be completing calculations. how to go over thesehttp://img155.imageshack.us/img155/8421/32990280.jpg...
  22. C

    Equivalent Resistance Between Terminals

    What is the equivalent resistance of the circuit in Fig. P29 between terminals A and B? R1 = 5 , R2 = 5 , R3 = 5 and R4 = 1 . Note that the wires cross but do not make contact at the center. V= IRe IRe= IR1 +IR2 Series= Re= R1+R2 Parallel= 1/Re= 1/R1+R2 Re= R1R2/R1+R2 I am assuming...
  23. Goddar

    Equivalent resistance/ geometric resistor network

    Homework Statement hi guys, i'm having trouble applying Kirchhoff's laws to determine the equivalent resistance of this symmetrical array of resistors (see attachment); i think there is a quick trick, using 4 current loops, but i can't remember it... nor find relevant documentation – this is...
  24. S

    3 identical resistorsgive the equivalent resistance of the circuit?

    Homework Statement 3 identical resistors..give the equivalent resistance of the circuit.? The diagram can be found here: http://img27.imageshack.us/i/physicsquestion.jpg/ Homework Equations The Attempt at a Solution
  25. Z

    Equivalent Resistance: Finding Resistance Between Diagonally Opposite Points

    If any among you have read I.E. Irodov , you would know that there is a problem based on an infinite mesh of resistances which has squares on it. To find the effective resistance between any two adjacent points we assign a current I in ward and I outward from the other point for a given V and...
  26. J

    What is the equivalent resistance and current in this parallel circuit?

    Homework Statement I need to find the equivalent resistance of the network outside the battery, and the current in resistor R2. the picture of my circuit is attached. R1= 10 ohms R2 = 6 ohms R3 = 5 ohms R4 = 30 ohms Homework Equations series Req= R1+R2... parallel 1/Req=...
  27. X

    Equivalent resistance if the values of the two resistances

    Two resistors are in series. Find the equivalent resistance if the values of the two resistances are as follows. a) 10 [Ω] and 20 [Ω]. b) 100 [Ω] and 1 [MΩ] (M stands for “Mega” or million). c) 3.0 [kΩ] and 6.7 [kΩ] (k stands for “kilo” or thousand). d) 400 [Ω] and 1 [Ω]. Repeat the...
  28. J

    Conceptual Question about Equivalent Resistance

    Homework Statement I don't quite understand how to read circuit diagrams, so I'm not sure how to find the equivalent resistance in some cases. What is the equivalent resistance of circuits A and B? I drew a picture to help me explain what I'm talking about: Homework Equations...
  29. J

    Thevenin Equivalent Resistance for a Black Box

    Homework Statement I am trying to find the theoretical Thevenin equivalent resistance for a black box that I used in an experiment. The measured Thevenin equivalent resistance was roughly 4786\Omega. However, I have tried several times to solve the problem, but keep arriving at a theoretical...
  30. J

    Thevenin Equivalent Resistance for a Black Box

    Homework Statement I am trying to find the theoretical Thevenin equivalent resistance for a black box that I used in a circuits experiment. The measured Thevenin equivalent resistance was roughly 4786\Omega, so the theoretical should be somewhere around that. However, I have tried several...
  31. I

    How to find the current and equivalent resistance in a parallel circuit

    Homework Statement Three 16 ohm resistors are connected in parallel and placed across a 34 V battery. (a) What is the equivalent resistance of the parallel circuit? (b) What is the current delivered by the battery? Homework Equations (a) (1/equivalent resistance) =...
  32. J

    Find the Equivalent Resistance of a Network

    Homework Statement A network consists of a combination of parallel and series connections. What is the equivalent resistance of the network? (Hint: Use the series and parallel resistance formulas). The network looks like this: Homework Equations When a circuit is in series, R = R1 + R2 + R3...
  33. D

    Equivalent resistance of a circuit

    1. The problem statement http://s685.photobucket.com/albums/vv212/dewdr0p714/?action=view&current=3circuitontakehometest1.jpg The voltage is on the left (100V) and the jagged lines are the resistors in Ohms. I need to find the equivalent resistance of the circuit and after that the current...
  34. J

    Engineering Simple circuit - Finding Equivalent Resistance

    Homework Statement Find Vo in the circuit. Image of Circuit Diagram Attached Variables: Vo, Io Given: Current (15 mA) Resistors (300\Omega, 300\Omega, 2k\Omega, 10k\Omega, 200\Omega, 3k\Omega Homework Equations Resistors in Series: Ra+Rb+Rc...+Rn Resistors in Parallel...
  35. S

    Engineering Basic Circuits - Equivalent Resistance

    Homework Statement Find the Resistance between terminals B-C, B-D Homework Equations The Attempt at a Solution The book says that the 2 80-ohm resistors are in parallel for terminals A-B, and the answer for B-C=90ohms, B-D=85ohms. I don't quite understand why this is. Is it...
  36. A

    Equivalent Resistance Homework: Find Solution

    Homework Statement Find the equivalent resistance between the two terminals :- Homework Equations Totally confused. The Attempt at a Solution Totally confused here as well...
  37. E

    What is the Equivalent Resistance of this Messy Circuit?

    Homework Statement Edit Circuit looks messed up, if you can quote me you can see the text of the circuit This is how the circuit looks*--------------------* | / \ | R2 R3 R1 / \ | *-------...
  38. H

    Equivalent Resistance, Diagonal Branches

    The first diagram is the given circuit. The second diagram is what I narrowed it down to. If anyone can check to see if the circuits are equivalent, I'd very much appreciate it. http://s62.photobucket.com/albums/h116/pepsi_in_a_can/?action=view&current=untitled2.jpg...
  39. S

    Equivalent resistance for an infinite grid

    There is an infinite square grid with each side of every cell making up the grid of resistance r. What is the equivalent resistance between two adjacent points on the grid?
  40. W

    Finding the Equivalent Resistance of a Circuit

    Homework Statement I need to find the equivalent resistance of the following circuit that can be found in the attachment. Also, I need to find if the C, L and Req are in series or parallel. Homework Equations Rs = R1 + R2 + R3 + ... + Rn Rp = (R1 * R2 * ... * Rn) / (R1 + R2 + ... +...
  41. W

    Equivalent Resistance of an RLC circuit

    Homework Statement It is in the attachment. NOTE: I supposed I did a little mistake when I drew the circuit with PSpice. The closed switch should look like .---->. instead of having that 45 angle. I don't know if it matters or not, so yea.. Homework Equations Rp = (R1 * R2)/ (R1 +...
  42. O

    Finding the equivalent resistance of this circuit?

    Hello Homework Statement **attachment of problem diagram at bottom** 1)Find the current through R3 2) Find the total equivalent resistance of the circuit Homework Equations Ohm's law, parallel resistances, series resistances, Thevenin's theorem, and all that jazz The Attempt at...
  43. G

    Equivalent resistance in multiloop

    Homework Statement Homework Equations Series: R(eq) = R(1) + R(2) + . . . Parallel: \frac{1}{R(eq)} = \frac{1}{R(1)} + \frac{1}{R(2)} + . . . The Attempt at a Solution I'm confident w/ (b) i think, but i just want to know if I'm going about these correctly. for (a), since...
  44. rootX

    How Do You Calculate the Equivalent Resistance in This Circuit?

    Homework Statement Find equivalent resistance in: http://img135.imageshack.us/img135/585/62083770ay3.jpg Homework Equations The Attempt at a Solution my r_eq^-1 = (30+60)^-1+(40+10)^-1 this is wrong. do i need to include 8 and 4 ohm resistors
  45. L

    Finding the equivalent resistance b/w a and b

    Homework Statement The problem is to find the equivalent resistance between a to b. Homework Equations Req in series = R1 + R2 + ... Rn Req in parallel = inverse of sum of 1/R1 + 1/R2 + ... 1/Rn Kirchhoff's Rules The Attempt at a Solution Well, I tried redrawing the circuit to figure...
  46. T

    Equivalent Resistance in partial parallel/series cicuit

    Homework Statement Find the equivalent resistance between points A and B in the drawing. Homework Equations Rseries = R1+R2+R3... Rparallel: 1/Rp = 1/R1+1/R2+1/R3... The Attempt at a Solution Reducing it down: 1/8+1/9 = 1/R1 = 4.235 That's in parallel with 20, so...
  47. B

    Finding the equivalent resistance PLEASE HELP

    Finding the equivalent resistance...PLEASE HELP! Homework Statement So I have a cube and it has resistance on every edge and I need to find what is the equivalent resistance? No numbers are given just the cube itself. Homework Equations The Attempt at a Solution How in the world...
  48. mbrmbrg

    Equivalent Resistance in battery

    Homework Statement Figure 27-33 (attatched) shows five 5.00 \Omega resistors. (Hint: For each pair of points, imagine that a battery is connected across the pair.) (a) Find the equivalent resistance between points F and H. (b) Find the equivalent resistance between points F and G...
  49. S

    How Do You Calculate the Equivalent Resistance in Complex Resistor Networks?

    Homework Statement This problem involves a sketch of a system of resistors, so I will do my best. A--xx1xx---|---xx1xx--B .\.....|..../ ...x...x...x ...x...x...x ...3...1...5 ...x...x...x ...x...x...x ...\...|.../ .....\.|./ ...\/ The numbers between the x's represent the...
  50. D

    How Do I Calculate Equivalent Resistance in Complex Circuits?

    Equivalent Resistance question HELP! Homework Statement The following diagram shows part of an electrical circuit. Find the equivalent resistance between points A and B of the resistor network. Here is the circuit in question : http://img182.imageshack.us/img182/8742/physicsyf0.th.png...
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