Equivalent Definition and 1000 Threads

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. E

    Engineering Is This a Norton Circuit with the Current Source on the Left?

    Homework Statement Is this simplified enough to be considered a norton circuit? Does the current source HAVE to be on the left? Homework Equations N/A The Attempt at a Solution N/A
  2. R

    Find Thevenin Equivalent of Circuit

    Homework Statement Find the Thorton equivalent of the circuit shown [/B] Homework Equations Voc=IscRs Rseries=R1 +R2+... Rparallel=R1-1+R2-1+... The Attempt at a Solution So, I thought I should first solve for the Rsource, by shorting all of the voltage sources: However, I don't think the...
  3. R

    Rth = (8 || 12) + 36 = 74.2 Ohms

    Homework Statement Find the thevenin equivalent of the cicuit shown below with V=500 V and i=10 A Homework Equations Voc=Vth Isc=VN The Attempt at a Solution [/B] So, to solve this, I used my instructors method of first finding the Rth. So, what I did was set the independent sources to...
  4. ShayanJ

    A For finite dimension vector spaces, all norms are equivalent

    I searched for a proof of the statement in the title and found this document. But it just proves that for two norms ## \rho(x) ## and ## ||x|| ##, we have ## m\rho(x)\leq ||x|| \leq M \rho(x) ## for some m and M. But how does it imply that the two norms are equivalent? Thanks
  5. Z

    Solve for Equivalent Resistance - Resistor is shorted?

    Homework Statement I'm studying for a test and since this is technically a textbook problem I figured I'd post here to prevent being flagged. I have the circuit redrawn. Homework Equations Series: Req = R1+R2... Parallel: 1/Req= 1/R1 + 1/R2... The Attempt at a Solution I want to understand...
  6. B

    Find thevenin equivalent resistance with diode.

    Homework Statement I have a circuit with a diode in it. I have to find the thevenin equivalent in order to reduce the circuit to a DC source, single resistor and single diode. How do I account for a diode when trying to find Rth and Vth? Do I just remove it and have it act as a short circuit or...
  7. Z

    Engineering Find the Thevenin Equivalent Circuit

    Homework Statement Homework Equations Node Voltage Method V=IR The Attempt at a Solution KCL at Node 1: KCL at Node 2: i is the current moving towards "a" I've simplified the two equations down but the problem I run into is that normally I'm able to write a third equation to define i0...
  8. R

    Engineering The equivalent resistance of the circuit

    Homework Statement Find the equivalent resistance of the circuit shown, for circuit 3.7b, the one in the upper right : https://scontent-ort2-1.xx.fbcdn.net/v/t34.0-12/14429160_641550399338143_303002326_n.png?oh=ad8d346cfcaff147c9cd7a9d2b509411&oe=57E6C47C Homework Equations Rseries=Rtotal...
  9. Aleksa Stanojlovic

    Norton Equivalent with dependet current source - Problem

    Hey everyone... I've tried to solve this problem with all kind of methods ,but I couldn't do it. I have tried to make an open circuit between R2 and R2 and then to find thevenin voltage and Ri but I have problem solving for thevenin voltage because of this dependent current source... Please give...
  10. M

    Endothermic and Threshold reactions - Are they Equivalent?

    Hi, up to this day I thought that endothermic and threshold reactions are equivalent. I mean each endothermic reaction must be threshold and each threshold reactions must be endothermic. But I think I was wrong. Here is example (from this source Q-value): 10B(n,2*alpha)T This threshold...
  11. Eagle9

    Calculating the equivalent dose for intraperitoneal injection

    Hello guys :cool: Imagine that we have got a rat and we administer a certain dose (let it be 4.0 µl of a 0.052 M solution) of some (let’s say Propionic Acid - PPA) drug in a intracerebroventricular way – directly in rat’s brain. Now imagine that we administer the same drug in intraperitoneal...
  12. Marcin H

    Thevenin Equivalent & Available Power?

    Homework Statement Homework Equations V=IR Node Voltage Thev/Nort The Attempt at a Solution So I set up my equations in the picture below, but I'm kinda confused about the Vx's in the equations. First, did I set these up correctly? If so, solving them I get that V2=0 which would mean my...
  13. J

    Equivalent Bending Moment due to Impact Formula?

    Hi guys and girls, I've been working on this problem for a little while now but I'm not really getting the result that I want. This is what I have: I have what is essentially a big pair of vice grips controlled by a hydraulic cylinder. The cylinder opens and closes both arms of the vice grips...
  14. D

    I The two equivalent parallel velocity vectors

    This is an exercise from the textbook Apostol Vol 1 (page 525, second edition), and I do not know how to prove it: Suppose a curve C is described by two equivalent functions X and Y, where Y(t) = X[u(t)]. Prove that at each point of C the velocity vectors associated with X and Y are parallel...
  15. R

    Equivalent resistance of pentagon of resistors

    Homework Statement Here: http://imgur.com/a/5rRgu 2. Homework Equations V=IR The Attempt at a Solution Basically from reversing the polarity of the cell and looking at a mirror image of the circuit i got the following relationships. First I(9)=0 then I(1)=-I(4) I(5)=-I(6) I(7)=-I(8). I...
  16. S

    Calculate R1 and R2 given equivalent resistance

    Note: I have come up with a solution myself, but I am trying to understand a different approach to the problem. My textbook solves it in a different manner, and I am having trouble following along. Homework Statement The last part of the problem "determine R1 and R2 such that Rin = 200k". I am...
  17. C

    Peak-hold equivalent amplitude for transient vibration

    I have a question regarding transient vibration data I received that was processed into a peak-hold equivalent amplitude (units = g). I have come across peak-hold before which is a type of "averaging" that retains the highest values from each estimate in random vibration overlap processing and...
  18. bananabandana

    Are the Gibbs and Boltzmann forms of Entropy equivalent?

    Homework Statement Are the Gibbs and Boltzmann entropies always equivalent? Homework Equations $$ S=k_{B}ln\Omega $$ [Boltzmann entropy, where ##\Omega## is the number of available microstates $$ S=-k_{B}\sum_{i}p_{i} ln(p_{i}) $$ [Gibbs entropy, where ##p_{i}## is the probability of a...
  19. S

    Engineering Equivalent Circuits: Why Are They the Same?

    1. Homework Statement Why are the two circuits below equivalent? Homework Equations N/A The Attempt at a Solution Background: I am studying BJTs, and in my textbook the equivalent resistance of resistor 1 and 2 is noted to be in parallel. The text provides no explanation why. In my search...
  20. W

    MHB Equivalent Uniform Annual Cost

    FasterTrucks Ltd is a transport company. The enterprise needs to decide if a new delivery vehicle will be purchased. Two models are currently considered. You are required to indicate which one of the two models should be purchased. You decide to apply the method of EQUIVALENT UNIFORM ANNUAL...
  21. YellowBelliedMarmot

    Engineering Thevenin Equivalent of AC RLC Circuit w/ Dependent Voltage

    Homework Statement Find Vth and Zth. frequency = 2kHz Homework Equations w = 2 * (pi) * f ZL = j w L ZC = -j / (w * C) V = I*Z ZR = R The Attempt at a Solution At first I tried using nodal analysis which I receive the value V = 0 v. I believe this is because this circuit only has dependent...
  22. R

    Equivalent force couple systems at a point on a rigid body

    Homework Statement Attached is a pdf of the assignment problems, I'm looking at problem 1 under the "Try" section. It shows a rod attached to a wall bracket on the left, with a force applied on the right side. I'm also including a link to the solution, it's under "Problem 3.83" -...
  23. Garlic

    A Strong force bremsstrahlung equivalent

    Are there strong interactional equivalents of synchrotron, bremsstrahlung and cerenkov radiation? Or for the weak/gravitational interactions? For example, will an accelerating bare quark emit gluons?
  24. D

    Engineering How do I find the Thevenin Equivalent of this circuit?

    Homework Statement I need to find the Thevenin Resistance and the Thevenin Voltage Homework Equations Vth =Rth I (Short Circuit) The Attempt at a Solution I know the answer is supposed to be Rth = 3Ω and Vth = 0.5V, but I couldn't get there with my method. I only get the Rth to be 3 Ω if I...
  25. pizzicato

    A discrete equivalent of the Poisson coefficient

    Hello, I'm about elaborating a discrete mass-spring model to describe the vibration of a thin isotropic plate. For the flexion i choose a kind of spiral spring in the two directions X and Y: so the momentums will be Mx= Cbx.(Delta Thêta) ; My = Cby.(Dela Psi). and the energies: Eb =...
  26. Z

    Norton's Equivalent - What do you do in this situation?

    Hi, So I have managed to get part of the way through solving a circuit that is being made into a Norton's equivalent circuit. But now I'm stuck on the Isc part. I know I have to use the current divider rule, but I'm not sure how to use it in this situation. Here's a diagram:
  27. K

    Determining Thevenin equivalent and time constant

    Homework Statement Homework Equations ; 3. The Attempt at a Solution [/B] Here is my thought process and assumptions. Without Vs1 and R2, the open-circuit current would be Vs2/R2, but I know Vs1 and R1 must be contributing in some way. I'm thinking of summing the Voltage sources and using...
  28. Swapnil Das

    Method of Symmetry for Equivalent Resistances

    I have been studying the method of symmetry from some days, which essentially reduce the effort needed for the evaluation of equivalent resistances. My textbook states: Points having symmetrically located about initial and final points have the same potentials.So, the resistances between these...
  29. W

    Find Equivalent Capacitance Between A & B with Capacitor

    Homework Statement https://scontent-kul1-1.xx.fbcdn.net/v/t34.0-12/13228153_10206233880597531_197570509_n.png?oh=32466b5e1ab50b8c8a0f49be9d044411&oe=573C076F Find the equivalent capacitance between A and B Homework Equations Capacitor The Attempt at a Solution...
  30. M

    Engineering What are the implications of Thevenin equivalent circuits on circuit behavior?

    Hiya, this is my first time posting so apologies for any errors in formatting. :oldsmile: I am confused as to whether when Thevenising a portion of a circuit is it to simplify BUT provide the same output characteristics, meaning the workings of the Thevenin part of the circuit may behave...
  31. e2theipi2026

    MHB Equivalent Goldbach proof impossible question.

    Prove that the number of unordered partitions of an even number 2n into 2 composites is greater than the number of unordered partitions of an odd number 2n+1 into 2 composites for n>1 and n\ne p prime.
  32. T

    I Prove Logical Equivalence of P->(Q or R)

    From the text it says (P -> Q) or (P -> R) is equivalent to P -> (Q or R) I tried to see if this is true so I tried (P \to Q) \lor (P \to R) \\ (P \lor \neg Q) \lor (P \lor \neg R) \\ P \lor \neg Q \lor \neg R \\ P \lor \neg(Q \land R) \\ P \to (Q \land R) and P \to (Q \lor R) \\ P \lor...
  33. G

    "Biot-Savart equivalent" of Faraday's Law?

    This is a repeat of this thread https://www.physicsforums.com/threads/biot-savart-version-of-maxwell-faraday-equation.855423/ That thread was dominated by one verbose poster. I am repeating this thread so as to hear the opinions of others.Ampere's Law can be derived from the Biot-Savart Law...
  34. M

    The battery equivalent internal impedance equation

    Homework Statement Hello, long story short: I need to create a model of Li-Ion battery and I'm stuck on calculating the battery equivalent internal impedance. The thing is, I don't know the equation or even how to make one. However, I have a circuit drawing: Homework Equations Values in...
  35. G

    Thevenin equivalent resistance problem

    Homework Statement Homework Equations V=IR The Attempt at a Solution [/B] I found that the current around the circuit was 5mA using kirchhoffs law ( i think) If this is true then the T.E.V should be the voltage across the 120ohm resistor which is .6V (120*5e-3). Now I'm stuck and not sure...
  36. nfcfox

    How to find equivalent resistance of this circuit?

    Homework Statement http://imgur.com/vUoRrhO [Note: Image copy inserted by moderator] Homework Equations Req for parallel is 1/Req=1/R+1/R... The Attempt at a Solution I have never seen a circuit like this and I'm not sure as to how I would go about calculating it since there is a resistor...
  37. D

    What's the equivalent distance of fall for 1500G

    Hi friendly physics gurus. I'm trying to find equations to help answer a question I have inside my own head. I know the weight of an object (w=170g). I know the object will be subject to a shock of (1500G and time to stop t=0.5ms). My question is: what's that like in terms of how high in the...
  38. I

    I What's The Discrete Math Derivative Equivalent?

    $$ƒ = b^n$$ $$ b,n,I ∈ ℤ $$ Condition: Upon choosing a base value b.. $$ n | b^n ≤ I $$ (n is determined based off the value of b to yield the highest ƒ without going over I) $$1<b<L , L<<I$$ where I is some large number, and L is also sufficiently large such that we want to avoid going...
  39. kamhogo

    Equivalent resistance between a and b -- Complex circuit

    Homework Statement Homework Equations Req = [ ( 1 / R1) + ( 1 / R2) +. ...]^-1 (Parallel) Req = R1 + R2 +. . . (Series ) The Attempt at a Solution I tried to simplify the circuit by spreading it out but I guess something is wrong with my simplification since I can't arrive at the correct...
  40. M

    Finding Thevenin Equivalent with Dependent Source

    Homework Statement I am trying to find the Thevenin Equivalent of this circuit Homework Equations Using KCL and node voltage The Attempt at a Solution I found the open circuit voltage for the thevenin voltage so far by the mesh current method, and now I am trying to find the closed circuit...
  41. P

    How to find equivalent circuits

    Hi, I need to learn how to find equivalent circuits using what my textbook calls open circuit and short circuit methods. Thank you all for you support
  42. P

    What Are These Two Equations for Equivalent Capacitor Circuits?

    I do not understand these two equations V[eq][/SUB] = V[in][/SUB] and R[eq][/SUB] = -(V[oc][/SUB] / I[oc][/SUB] ) Your help is much appreciated
  43. S

    Finding current and equivalent resistance

    Homework Statement The circuit consists of a battery (V0 = 48.0 V) and five resistors (R1 = 111 Ω, R2 = 182 Ω, R3 = 663 Ω, R4 = 334 Ω, and R5 = 465 Ω). Find the current passing through C, D, and G. Homework Equations V=IR The Attempt at a Solution I tried to find the equivalent resistance...
  44. L

    Equivalent circuit of an Induction Motor

    Hi, I have attached two circuits of an induction motor, one for steady state(1st circuit) and a dynamic model(2nd circuit). My question is: Why don't we include the induced emf in the steady state circuit? Looking at the dynamic circuit we include it, but not in the steady state circuit. Is the...
  45. M

    Logic: proof that [p -> (q ^ r)] <=> [(p ^ -q) -> r]

    I'm preparing for college on my own. I need to proof that: [p -> (q v r)] and [(p ^ -q) -> r] are logically equivalent. with 1) v "or" 2) ^ "and" 3) -q "negation of q" I did this using truth tables and this perfectly shows that those 2 statements are logically equivalent. Can someone confirm...
  46. hideelo

    I Equivalent statements of the weak energy condition

    Im reading Carroll's Spacetime and Geometry section 4.2 where he claims the following as the weak energy condition: Given a energy momentum tensor T and a timelike vector t then Tμν tμ tν ≥ 0. He claims that for a perfect fluid this is equivalent to the statement that ρ ≥ 0 and (ρ+P) ≥ 0...
  47. A

    DC equivalent circuit of CB transistor?

    figure 1 shows dc model of CB transistor, why is it that collector diode is taken as current source in equivalent circuit, why not emitter is also taken as current source ?
  48. A

    How to draw AC equivalent circuit of CE amplifier?

    in the attached diagram its seen that while drawing AC equivalent of the common emitter circuit, Re is not taken in, the AC equivalent diagram no.2. why?
  49. M

    What is the relationship between resistors in a circuit?

    Homework Statement I'm having trouble trying to find equivalent resistance. Here's a picture of some circuits I am trying to simplify (http://puu.sh/ngjMC/38160c3464.png) For example, in circuit a, I can see that the 84 ohm and 105 ohm resistor are in series, and that can be simplified, but...
  50. Pull and Twist

    MHB Are These Row Equivalent Matrices? Why Am I Getting Different Results?

    I am having trouble with the following problem; a.) Find a matrix B in reduced echelon form such that B is row equivalent to the given matrix A. A=\left[\begin{array}{c}1 & 2 & 3 & -1 \\ 3 & 5 & 8 & -2 \\ 1 & 1 & 2 & 0 \end{array}\right] So using my calculator I am able to get...
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