What is Equivalent: Definition and 1000 Discussions

Equivalent weight (also known as gram equivalent) is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance. The equivalent weight of an element is the mass which combines with or displaces 1.008 gram of hydrogen or 8.0 grams of oxygen or 35.5 grams of chlorine. These values correspond to the atomic weight divided by the usual valence; for oxygen as example that is 16.0 g / 2 = 8.0 g.
For acid–base reactions, the equivalent weight of an acid or base is the mass which supplies or reacts with one mole of hydrogen cations (H+). For redox reactions, the equivalent weight of each reactant supplies or reacts with one mole of electrons (e−) in a redox reaction.Equivalent weight has the dimensions and units of mass, unlike atomic weight, which is dimensionless. Equivalent weights were originally determined by experiment, but (insofar as they are still used) are now derived from molar masses. Additionally, the equivalent weight of a compound can be calculated by dividing the molecular mass by the number of positive or negative electrical charges that result from the dissolution of the compound.

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  1. R

    To divide radical expressions; quick question, are these equivalent?

    Homework Statement There is no problem, ^title^, just a quick question :) The book's answer: \frac{x\sqrt{x}-x\sqrt{2}+2\sqrt{x}-2\sqrt{2}}{x-2}} My answer: \frac{x+2\sqrt{x}-x-2\sqrt{2}}{x+2} I combined like terms in the numerator... at least I think I did it correctly?
  2. S

    Thevenin Equivalent: Solve DC Power Supply 30V/400mA, 27V/600mA

    Homework Statement Find the Thev Eq circuit for a DC power supply that has a 30-volt terminal voltage when delivering 400mA and a 27-volt terminal voltage when delivering 600mA. Homework Equations KVL: Vs=IsR1+IsR2 Vth=Isc*Rth The Attempt at a Solution Assuming that each 3volt...
  3. J

    Equivalent capaticnace, charge, voltage

    Homework Statement Find the equivalent capacitance of the circuit below. Also determine the charge of each capacitor and the potential difference across each capacitor. http://img18.imageshack.us/img18/2616/physicss.jpg Homework Equations Q=VC Parallel Ceq = C1+C2+C3 V1=V2=V3...
  4. S

    Engineering What is the Thevenin Equivalent Circuit for a Car Battery?

    Homework Statement A car battery has an open-circuit terminal voltage of 12.6 volts. The voltage drops to 10.8 volts when the battery supplies 240 amps to the car's starter motor. What is the Thevenin eq for this battery? Homework Equations I think the root of my problem is the setup of...
  5. B

    Representation of magnetic hysteresis loss as a resistance in equivalent circuits

    Hi Guys, :smile: Can someone please explain to me the logic behind the representation of 'Magnetic Hysteresis loss' as a resistance in electrical equivalent circuits?... will be extremely grateful. Thanks & Regards, Shahvir
  6. 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) =...
  7. H

    Is S^{c} the key difference in this logical equivalence?

    Is it equivalent? ( \forall x \in S \forall y P(x) ) <=> \neg ( \exists x \in S^{c} \exists y \neg P(x) ) Attempt at solution I think it should be ( \forall x \in S \forall y P(x) ) <=> \neg ( \exists x \in S \exists y \neg P(x) ) The diiference to the above statement is S^{c}.
  8. C

    Capacitance: Equivalent C of a Network

    Homework Statement A capacitor network is shown below. http://img99.imageshack.us/img99/9967/79727282.gif What is the equivalent capacitance between points y and z of the entire capacitor network? Homework Equations In parallel: C = c1 + c2 + ... In series: 1/C = 1/c1 + 1/c2 +...
  9. 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...
  10. H

    Lumens, candelas & equivalent LEDs

    I'm trying to determine the millicandela rating of an LED from a keychain to find equivalent LEDs of different colours. The keychain LED specs are as follows: Luminous Flux value: 4 lumens (from box) Viewing Angle: 30° (I got this value by comparing to LEDs with marked angles) Wavelength...
  11. 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...
  12. F

    How Do You Calculate Equivalent Capacitance in Complex Circuits?

    Homework Statement I need to find the equivalent capacitance between points 1 and 2 in the following circuit, with each capacitor having capacitance C: Homework Equations For n capacitors in series: 1/C_t = 1/C_1 + 1/C_2 + ... + 1/C_n For n capacitors in parallel: C_t = C_1 + C_2 + ... +...
  13. S

    Engineering Thevenin Equivalent for circuits with dependent sources

    Hi! Good day! I was studying Circuit Theorems when I stumbled upon this circuit that has a dependent current source asking for a Thevenin equivalent. Up until now, I was only familiar with solving circuits with independent sources so this has me having a hard time. I tried using...
  14. P

    Homogenization of a plate to an equivalent rod .

    Homogenization of a plate to an equivalent rod... Folks, I have a doubt... Sorry if it is a really stupid one...:uhh: Imagine you have a steel plate say 200mm by 200mm in dimension, with a stiffness of say some "k" N/mm... Is there any formula to convert that plate into an equivalent...
  15. 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...
  16. C

    Singular values of unitarily equivalent matrices

    Homework Statement If two square matrices, A and B are unitarily equivalent then A = QBQ* for some unitary Q of the same size as A and B. Prove that A and B are unitarily equivalent if and only if they have the same singular values Homework Equations The Attempt at a Solution I...
  17. 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...
  18. X

    Is there an engineering equivalent to physicsgre.com?

    Well, is there? :shy:
  19. A

    Finding Thevenin Equivalent: 6 Ohm Resistor

    I have to find the thevenin equivalent of the following circuit in order to find the current and potential difference across the 6 ohm resistor. I can not get to know that where should I start. Should I divide the circuit into 2 parts or what? http://img141.imageshack.us/img141/2690/416qr1.th.jpg
  20. L

    Thevenin equivalent circuit problem

    I start with the Thevenin equivalent. \hat{R} = R_2 + R_4 || R_1 = 6 \Omega R_{Th} = R_3 + \hat{R} || R_5 = 8 \Omega The correct answer here should be 2 \Omega
  21. J

    Finding Thevenin Equivalent of Circuit

    Finding the thevenin equivalent of the above circuit This is what I did, I set the current source to zero, no current passes through so the Rth is the resistor on farthest right // with another 2 in series with 4. so it is 5ohms? Finding the open circuit voltage, I use a current...
  22. J

    Engineering Thevenin Equivalent in AC circuit

    Hi All, My name is Joaquim and I'm new in this forums. I am a Electronic Engineer student (1st Year). I have a question about a Thevenin equivalent circuit in AC. I need someone to tell me if I'm doing the right math in finding the thevenin equivalent (AB point): Please see the...
  23. B

    Engineering Transformer Equivalent Circuit

    Homework Statement Hi. Why does one conduct an open-circuit and a short-circuit test on a transformer to determine its equivalent circuit parameters? I've read that a) the open-circuit test determines the parallel parameters - the R and X equating to the core loss, and b) the short-circuit...
  24. B

    Engineering Transformer Equivalent Circuit Questions

    Hi. Why does one conduct an open-circuit and a short-circuit test on a transformer to determine its equivalent circuit parameters? I've read that a) the open-circuit test determines the parallel parameters - the R and X equating to the core loss, and b) the short-circuit test determines the...
  25. J

    Equivalent force-couple system (conceptual)

    on a 3d graph i have 3 forces in different places pointing different directions. I am supposed to find the equivalent force-couple system about some point D. but 1 of the forces is aligned with point D and therefore creates no moment about D. how would i do this? Do i just find the moment of...
  26. B

    Thevenin's equivalent circuit problem

    Homework Statement use thevenin's theorem to find the current in the 3 ohm, parallel branch, resistor http://img217.imageshack.us/img217/909/img0267cc7.jpg Homework Equations Thevenin equivalent circuit, voltage divider ruleThe Attempt at a Solution I don't think its possible, since...
  27. Q

    Equivalent capacitance in complex circuit

    Homework Statement Hello, I was given this problem as a homework assigment. Each capacitor in the figure has capacitance C. What is the equivalent capacitance between points a and b? The answer is given in "C_eq/C" Homework Equations I used the...
  28. G

    Proving equations are equivalent

    I need help proving that (A then B) then C and (A and B) then C are equivalent. Can anyone help?
  29. G

    Are (A then B) then C and (A and B) then C equivalent?

    I need help proving that (A then B) then C and (A and B) then C are equivalent. Can anyone help?
  30. 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...
  31. J

    Calculating RoE for AC Equivalent Transistor Amplifiers

    Hey everyone, In my EET program we're going over AC equivalent transistor amplifiers. We've gone over how to do some of them in class but I can't seem to figure out how to find roe. I have the output characteristic of our 2N2222 transistor and made the DC load line but I'm not sure were to go...
  32. A

    Equivalent Norms: Piecewise Continuous Linear Function [0,1]

    Suppose that ||f||= int 01| f(x) | dx and f is a piecewise continuous linear function on the interval [0,1]. If ||| f ||| = int 01 x | f(x) | dx, determine if the two norms are equivalent. I know the first defines a norm, and the space is not complete. Can anyone offer any hints as to...
  33. A

    Are there international REU equivalents for undergraduates?

    I've been looking into some summer Research Experience for Undergraduates (REU) programs here in the US, but is there some kind of equivalent program for countries in Europe and elsewhere?
  34. O

    Moments and Equivalent Systems

    Homework Statement Here is the problem I am stuck on, need some advice Homework Equations ----- The Attempt at a Solution I found the moment to be -19.282 for the system shown (not sure if it correct) but I am confused about how to drawing will look for the equivalent system. (- is added for...
  35. E

    Limit Superior - Equivalent Definitions

    Let a_1, a_2, ... be a bounded sequence of real numbers. According to Rosenlicht's "Introduction to Analysis", the limit superior is defined as sup {x : a_n > x for infinitely many n}. It is very hard to work with this definition. I'm used to the simpler one: sup {a : there exists a...
  36. H

    Equivalence of d and p Metrics on X

    Homework Statement Show that d and p are equivalent metrics on X where p=d(x,y)/(1+d(x,y)) Homework Equations ive proved already that p is indeed a metric too (if d is a metric). The Attempt at a Solution I believe I am supposed to use the Lipschitz condition where there exits...
  37. M

    Two (equivalent?) integrals

    1. This is part of a larger calculation. I do it one way and get the right answer and do it a seemingly equivalent way and get the wrong answer. The question is just about reconciling the two integrals below. 2. I_1 = \int \frac{sin(2x)}{2} dx = -\frac{cos(2x)}{4} \frac{sin(2x)}{2}...
  38. D

    Equivalent Norms: Proving No M > 0 for f

    Homework Statement http://img394.imageshack.us/img394/2907/54050356xf9.png The Attempt at a Solution I'm stuck at exercise (e). What I have to proof is that there is no M>0 such that: ||f'||_{\infty} \leq M \cdot ||f||_{\infty} But I'm having a hard time showing that for...
  39. B

    Equivalent resistors/capacitors etc. tricky problem

    Homework Statement Find equivalent capacitance between terminalsHomework Equations C_eq = C_1 + C_2 for parallel C_eq = 1/((1/C_1) + (1/C_2))The Attempt at a Solution I can't tell what's in parallel and what's in series. That conductor in the center is throwing me off. Any help por favor? You...
  40. G

    Integral of full-wave rectified sinewave, find equivalent sine waveform

    Homework Statement I am given two waveforms (a square wave and DC) that define the maximum allowable operating parameters for an LED. I wish to derive the maximum allowable fully-rectified sine waveform (120hz). Square wave: 442mW peak, 0.1ms pulse width, 10% duty cycle DC: 87mW See...
  41. E

    Equivalent circuit for non linear capasitor

    what is the equivalent circuit for a non ideal capasitor? and if we have a parallel plate capasitor which consist of 2 metal plate of area A and held a distance apart d,we fill the region between the plate with a material with conductivity s and permitivity e.what is the inductance,resistance...
  42. S

    Mathematica Mathematica equivalent for Linux

    Does anyone know of a Mathematica equivalent software for Linux? A link for download will be good.. Thanks
  43. T

    Equivalent Force couple to single resultant

    I have reduced the problem involving different forces and a couple in a 2D plane to an equivalent force-couple system. The force F is -27.5lbi + 11.65lbj, and the couple is -66.8inlbk. I need the single offset resultant that accounts for the couple. The way I thought to solve it was to take...
  44. 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 / \ | *-------...
  45. R

    Symmetric Axial Vector Torque and Uniform Forces: Exploring Equivalence

    Would it be possible for a symmetric axial vector torque to be equivalent to the shear stress of two uniform rectilinear forces? as they seem to be non-related, but it works out that they should be. :grumpy:
  46. M

    Comparing Metrics on R: d1 vs. d2

    Let <r,θ> be polar coordinates on R². Define f:R-->R² by f(t)=<et,t>. Let d1 and d2 be the metrics on R defined by: d1(t1,t2) = |t1 - t2|, d2(t1,t2) = ||f(t1) - f(t2)|| Are d1 and d2 equivalent? If not, is one finer than the other?
  47. 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...
  48. J

    Engineering Calculating Current in Thevenin Equivalent Circuit?

    I trying to figure out a thevenin equivalent circuit I want to calculate the current I so I can't get the resistance for the thevenin equivalent. Im not 100% sure how to calculate I, can I use KCL on the node under the number -8.7V? http://img98.imageshack.us/my.php?image=curfc7.jpg
  49. B

    Equivalent energy stored in compressed gas

    Hi All I'm trying to work out a method to determine the efficiency of a compressed air motor. Obviously I can measure the input pressure and flow rate of the compressed air, and I can measure the output power of the motor with a dynomometer. What I want to know is how much energy is...
  50. D

    LS-coupling for configurations with equivalent electrons

    List the values of the magnetic quantum numbers ml1, ml2 ms1 and ms2 for the two electrons in a np2 configuration to show that fifteen degenarate states exists within the central field approximation. ml can take values -1,0,1 i believe. ms can take values -1/2 and 1/2. how does this ad...
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