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. Casper Hansen

    Thevenin equivalent (symbolic circuit calculation)

    Homework Statement I have trouble to find the right procedure to transform the circuit below to a thevenin equivalent. I am looking for a symbolic solution a step by step guidance of where to start and how to add/locate all the impedance in series and parallel in order to calculate the sum of Z...
  2. G

    2 definitions for voltage, how are they equivalent?

    So I'm studying electrostatics and I came across to two different definitions of potential difference/voltage (because we're in stationary regimes) and I'm having trouble understanding how the expressions are equivalent. They are for a voltage between point A and point B $$U=V_a - V_b...
  3. L

    MHB Equivalent Rates - Valuation Mathematics

    Hi all I am currently working on questions focusing on valuation mathematics. A question on equivalent rates is perplexing me. The first question is straightforward, but I get stuck on the second question. Q1. What is the value of the right to receive £100,000 annually in advance in...
  4. Islam Sabry

    The equivalent resistance for the resistors in this circuit?

    Homework Statement If the circuit of parallel and series resistors , is as follows , what's the equivalent resistance for the group? Homework Equations neglecting the battery internal resistance... irrelevant to the question. The Attempt at a Solution I tried to do the following R1=8+12=20...
  5. M

    Algebra Algebra equivalent to Euclid’s Elements?

    I want to get a copy of historical Algebra literature that essentially the equivalent of Euclid’s Elements for Algebra. Does anyone have any recommendations?
  6. HCverma

    What is the difference between 'equivalent' and 'equivalence'?

    What is the difference between 'equivalent and equivalence'?
  7. Krushnaraj Pandya

    Find the equivalent capacitance of the circuit

    Homework Statement Find equivalent capacitance between A and B of the given figure (pardon camera quality) Homework Equations All related The Attempt at a Solution marking junctions, From left to right, starting from original point A-and ending at B I wrote potential at them as follows...
  8. Mzzed

    RF Power Meter / SWR Meter Equivalent Circuit

    I'm starting to get into RF electronics, and an upcoming project involves the use of a power meter / SWR meter. How do we model a power meter in terms of an equivalent circuit? i.e. is it just another impedance? or a transformer? or does it not effect the circuit at all, so we just don't include...
  9. icesalmon

    Engineering Finding the Thevenin Equivalent Circuit for a Network with a Load Resistor

    Homework Statement I just want to check to see if my understanding in anything here has gaps. Q: Find the Thevenin equivalent circuit for the network external to he load resistor ##R_L##: Homework Equations Ohm's Law: ## V = IR ## Kirchoff's Voltage Law: Σ##V_{drops}## + Σ##V_{gains}## = 0...
  10. icesalmon

    Engineering Find the Thevenin equivalent circuit

    Homework Statement Find the Thevenin equivalent circuit for the portions of the networks in the following circuit: Homework Equations Kirchoff's Voltage Law: ΣVdrops = ΣVgains Kirchoff's Current Law: ΣIclosed loop = 0 Ohms Law: V = IR The Attempt at a Solution Determination of the Thevenin...
  11. M

    Testing Is there a Europe equivalent to the Physics GRE?

    Is there a qualification undergrad engineers can take during university to show their aptitude for physics and maths? Like a recognised test, aptitude test that they can put in their academic record as well? Anything along these lines at all? Is there one that is recognised in UK, Europe and...
  12. jk22

    B Equivalent gravitational forces in other galaxies

    Could it be imagined that due to a particular stars' distribution in a galaxy the gravitational force felt would be like $$f(\vec{e}_r)/r^{\alpha}$$ where $$\alpha\neq 2$$ but near 2 and f a non spherically symmetric function (like a comet around a flat galaxy) ?
  13. jishnu

    Equivalent Capacitance: Find C Between A & B | Tips

    The picture attached with this post shows a combination of capacitors, we are asked to find out the equivalent capacitance between the points A and B. Provided that all the capacitors are identical and has an individual capacitance C. Can anyone help me provide basic ideas of solving these kind...
  14. S

    I finding the Thevenin equivalent resistance

    Homework Statement https://imgur.com/a/XD3Km4t I'm trying to find the thevenin equivalent resistance across the opened terminals. Homework Equations I know you short circuit the voltage source and do simple circuit analysis, however I'm getting confused in determining what resistors are...
  15. E

    I Finding the Summation Equivalent of a Product

    Hello, I have the following product, and I am looking for a summation equivalent \prod_{k=1}^K\left(1-\frac{1}{x_k+1}\right) Is this doable? I tried to use partial fraction but got nowhere! Thanks in advance
  16. M

    MHB Equivalent Norms: Proving $\|A\| \leq \|A\|_{Eucl} \leq \sqrt{n}\|A\|$

    Hey! :o Let $A=(a_{i,j})$ a real matrix with $m$ rows and $n$ columns, $x\in \mathbb{R}^n$ and \begin{equation*}\|A\|:=\sup_{\|x\|_2\leq 1}\|Ax\|_2, \ \ \|A\|_{\text{Eucl}}:=\sqrt{\sum_{i=1}^m\sum_{j=1}^n|a_{i,j}|^2}\end{equation*} I want to show that $$\|A\|\leq \|A\|_{\text{Eucl}} \leq...
  17. J

    Equivalent resistance between two points

    Homework Statement Homework EquationsThe Attempt at a Solution From symmetry , C and D are at the same potential . So , resistance between them can be removed . This leaves us with three parallel branches between A and B i.e 45 Ω || 45 Ω || 15Ω . The net resistance will be 9 Ω . But this...
  18. J

    Equivalent capacitance in a circuit

    Homework Statement Homework EquationsThe Attempt at a Solution I think the circuit given above is incorrect due to the presence of the two resistors . I have never seen/done a problem where equivalent capacitance is to be calculated across two points in a circuit , having resistors along...
  19. Robin04

    I Can Two Different Physical Theories Yield the Same Predictions?

    Is it possible that two physical theories are equivalent in the sense that their predictions are exactly the same but the mathematics they use is different?
  20. E

    Equivalent resistance of a circuit

    Homework Statement Consider the electric circuit shown in the figure. Assume that V = 13.7 V, R1 = R2 = R3 = R4 = R5 = 7.00 Ω. What is the equivalent resistance of the circuit? Homework Equations total voltage of a series circuit is the sum of the voltage of all the resistors total current of...
  21. J

    Equivalent resistance between two points on a circuit

    Homework Statement Homework EquationsThe Attempt at a Solution [/B] The circuit is symmetric about AC and BD , but I am not sure how to use this to simplify the circuit . Could someone help me in solving this circuit using symmetry considerations .
  22. R

    I Concept behind equivalent metrics

    My professor never really went over this concept clearly in Advanced Calculus. The definition of an equivalent metric from my lecture slides: Two metrics: d1 and d2 on a metric space X are called equivalent when there exists M >= 1 such that M-1d1(x,y) <= d2(x,y) <= Md2(x,y) I am trying to...
  23. X

    Engineering Attempt at Thevenin Equivalent Circuit

    Hi, I am having trouble trying to determine Voc on this circuit. I have done the following to attempt it: 1) Converted my Voltage source to rectangular format (from polar) 2) Converted my capacitor and inductor to Xc and XL 3) I tried using KCL to find Va that's at the three-way on the circuit...
  24. W

    Notion of Equivalent Relational Databases (RDBs)?

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  25. F

    Engineering Find the Thevenin Equivalent circuit

    Find Thevenins Equivalent circuit external to RL, then find I. Here's my work : 5Ω & 5Ω series → R(1) = 5+5 = 10 Ω 10Ω & R(1) parallel→ R(2) = (10*10)/(10+10) = 5 Ω 2Ω & R(2) series → R(3) = R Th = 5+2 = 7Ω V = I R R = (R Th * RL)/(R Th + RL) R = 70/17 Ω V = 5 * (70/17) = 350 / 17 V = 20.6...
  26. M

    MHB Is 2/3 Always the Same as 4/6?

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  27. G

    MHB Problem about equivalent conditions for a basis of a free module

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  28. J

    Equivalent capacitance of capacitors

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  29. T

    Find the equivalent model of an infinite ladder circuit

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  30. A

    Equivalent point charge, dipole, and quadrupole

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  31. N

    Engineering Find the equivalent resistance of this circuit w/o Data?

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  32. tensor0910

    Engineering Circuit diagram: find the equivalent resistance

    Homework Statement problem in title:Homework Equations 1/Rtotal = 1/r1 + 1/r2...[/B]The Attempt at a Solution [/B] I can get it down to 4 resistors...but the one's I have circled I don't know how they behave. I just need a little kick in the right direction lol. Thank you in advance!
  33. H

    I Dense set equivalent definitions

    Hello all, I am an undergraduate student who is studying real analysis from Rudin's POMA and I am trying to prove that these two definitions that I have for dense sets are equivalent: 1) Given a metric space X and E ⊂ X ; E is dense in X iff every point of X is a limit point of E or E = X or...
  34. G

    Engineering Thevenin's equivalent circuit for capacitor

    [Mod Note: Thread moved from technical forum hence no homework template.] Okay so the image i uploaded only because of the cirscuit never mind the text to it. I don't understand things mathematicaly verry well. I like to have a good physical grasp on what is going on with the circuit. That...
  35. FreeBob

    Calculating equivalent horsepower for a jet engine

    Trying to remember some basics. I know the thrust of a jet engine. I'm thinking about equivalent HP. I can establish HP at a given speed, but what about while accelerating? I will display my ignorance here :( Power for static, non accelerating flight: Power = [Thrust x Airspeed] Thrust...
  36. W

    Equivalent to Joining tables (SQL) in Excel?

    Hi All, Sorry if this seems pretty lost. I want to compute an expression of the type A/B with data given in different sheets, i.e., A is given in sheet i and b is given in sheet j. Now, I know that in SQL Server ( SQL in general), one can join tables. Is there a similar way of getting data...
  37. F

    Equivalent mass of rotating parts

    Hi everyone ! i want to find the equivalent mass of a car rotating parts and i came across this site which provides some cars formula : http://www.thecartech.com/subjects/auto_eng/car_performance_formulas.htm So far i understand almost everything until i get to the part where inertia resistance...
  38. S

    Voltage equivalent of temperature

    How is voltage equivalent of temperature(Vt=KT/q) defined and derived? Is it related to kinetic energy(which is equal to 3kT/2)?
  39. Nikhil Rajagopalan

    Mechanical equivalent of heat

    When computing the rise in temperature on a body due to mechanical work, if we stick to using SI units, do we need the conversion factor called mechanical equivalent of heat. That is, can we readily equate W = Q and hence W = m x C x ΔT . Where 'm' is the mass of the substance on which work is...
  40. C

    The length of a pendulum that is equivalent to a rocking hemisphere

    Homework Statement A solid sphere is cut in half and a homogeneous hemisphere of radius r and mass M is set upon a table(with its flat side up). The surface of the table is perfectly rough. The hemisphere rocks back and forth with small amplitude excursions from equilibrium. What is the length...
  41. Frankenstein19

    How Do Controlled Sources Impact Thevenin Equivalent Calculations?

    Homework Statement [/B] Homework EquationsThe Attempt at a Solution First I found the equivalent resistance since the 3 ohm resistor and 6 ohm resistor are in series. 9ohm. Then I did chose the node where the arrow points to as Voc, which is also va. KVL: (va+24V)/9ohm=1.33va I get va to be...
  42. Frankenstein19

    Equivalent resistance in a Wye formation

    Homework Statement Find the Thévenin resistance for each of the circuits shown by zeroing the sources. Homework EquationsThe Attempt at a Solution I replaced the current source with an open circuit and I'm left with a wye formation but I don't know how to calculate the equivalent resistance
  43. Krunchyman

    I What is the equivalent of a group in category theory?

    I understand that in group theory, a group consists of a set and a binary operation for the elements in the set, and of course all the group axioms. But if we move away from set theory into category theory, is a group defined on a category?
  44. J

    Engineering Transformer -- find equivalent circuit from efficiency and V.R

    Homework Statement For 200 KVA, 4000/1000 V transformer. 1 phase. Efficiency is 0.97 at full load and 60% load at unity power factor. No load pf = 0.25 Full load Voltage regulation at 0.8 pf lag is 5% Find transformer ckt parameters for referred to lv side Homework Equations efficiency is...
  45. H

    A On the equivalent definitions for solvable groups

    We have the 3 equivalent definition for solvable groups: There exists a chain of subgroups 1 < G1 ...< Gi + < G i+1 < Gr = G such that Gi is normal in Gi+1 and Gi+1/Gi is abelian. Another definition is there exists 1 < H1 ...< Hi + < H i+1 < Hs = H such that Hi is normal in Hi+1, and...
  46. Y

    Equivalent Resistance of Figure

    Homework Statement https://imgur.com/a/aVCeU Homework Equations (1/Req) = (1/Rv1) +(1/Rv2) Req = Rv1 + Rv2 The Attempt at a Solution I'm not sure which formula is the correct one to use.So.. I'm absolutely stuck. I tried downloading a bunch of circuit board simulators, but I couldn't find an...
  47. L

    Programs Nanotech degree equivalent to Physics

    Hello everybody just out of couriosity An undergraduate degree in EE or Computer engineering followed by a MS in Nanotechnology engineering (lectures in quantum and stat mech, chemistry, nanostructured materials with many lab activities...) can be considered in some way equivalent to a MS in...
  48. E

    Determining the equivalent resistence of a circuit

    Homework Statement I want to determine the equivalent resistance between A and D in the drawing below: [/B] Homework Equations 1/Req=1/R1+1/R2+1/R3+... And Req=R1+R2+R3+... The Attempt at a Solution I don't really know how to simplify this drawing, I'm not sure if one resistor isn't...
  49. Fb.Researcher

    Prove 2 and 3 state clock model is equivalent to Potts model

    Homework Statement A p-state clock model is a spin model in which states can be viewed as hands of a clock! Now knowing the models we should prove these two models are equivalent for ##p=q=2## or ##p=q=3## Homework Equations Potts model is described by $$ H = -J \sum_{<ij> } \delta_{...
  50. T

    Equivalent resistance of 2015 points

    Homework Statement 2. Homework Equations [/B]The Attempt at a Solution so i was thinking i could take a look at small number of points and then generalize it but my method soon breaks down in the diagram i have denoted the resistance of the segment beside it if there is a bracket it means...
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