Equivalent Definition and 1000 Threads

A 1.2 ton air conditioner has the capacity to freeze 2400 lb of ice at 0°C in a day. What is the equivalent rate of transport of heat in watts? QH(out)= QL(in) + Wi Coefficient of Performance= QL/ (QH-QL) Coefficient of Performance of an Ideal System: TL/ (TH-TL) QL/QH= TL/TH I...

I didn't think this question would fit in any of the other forums, hopefully this is the right place... I'm not sure how many other people on this forum are familiar with StackOverflow - it's basically a question-and-answer site for computer programming where members can rate each others'...

Homework Statement Find the Equivalent Capacitance: Homework Equations c=Q/V Conservation of energy The Attempt at a Solution I made Q1 be the capacitor of 1uf, the top 2uf be the capacitor of Q2, bottom capacitor of 2uf be Q'2, capacitor of 4uf be Q4, capacitor of 5uf be Q5...

Homework Statement Find the equivalent capacitance of the picture in the attachment file Homework Equations The Attempt at a Solution The circuit is neither in parallel or series. I tried breaking it up into series and parallel but it seem too easy to be correct. Any tips on solving this?

Not really homework, but a typical exercise question, so I figured it's appropriate to post it here. Homework Statement X,Y topological spaces f:X→Y x is a point in X Prove that the following two statements are equivalent: (i) f^{-1}(E) is open for every open E that contains f(x)...

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=...

http://img205.imageshack.us/img205/6923/logp.png What is the meaning of '+' above log? Is there an equivalent expression for this? Thanks

Does anyone know what is the equivalent UL level for FMVSS 302?

Hi everyone, Time for me to do another demonstration for some coworkers, and I want to make sure I'm being accurate. The idea is to explain how much force a small 2000lb car moving at 40mph has, and then explain the speed that an 8lb bowling ball would need to have the same amount of force...

Homework Statement Find the Thevenin Equivalent resistance for the network below: http://img27.imageshack.us/img27/8508/circuit.png Homework Equations R=(1/R1+1/R2)^-1 The Attempt at a Solution Hi all, to find the resistance i short circuited the volage sources and...

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...

Homework Statement all resistors have arbitrary values. the equivalent resistance needs be found between terminal a and b.Homework Equations I have not got a clue how to tackle this problem. as such there is no attempted solution either.The Attempt at a Solution any help would be great. chollins

Homework Statement Find an equivalent expression for sin3x in terms of function values of x, 2x, 3x, raised only to the first power. The Attempt at a Solution stuck! don't know where to begin I am reviewing for my exam right now I remember doing one of these problems before but I can't...

Hi, I found this question from a textbook: Suppose there are two black boxes, Box A has a 1V voltage source and 1ohm resistance (Thevein Circuit); and Box B has a 1A current source and 1ohm resistance (Norton Circuit). You only have access to the two terminals. How do you know which is which...

Homework Statement If the mass of a hydrogen atom is 1.67*10-27kg and the mass of an electron is 9.1*10-31kh, how many electrons would be required to have a mass equivalent to one hydrogen atom? Homework Equations The Attempt at a Solution I tried dividing them into each other...

(My previous thread on Bohm Interpretation quickly became 4 pages of mostly unrelated discussion. So I'm restarting here with more precise questions.) Okay, I've read some references on the Bohm Interpretation and I am still confused. As one paper mentioned, some extensions have stochastic...

1.) Using the table provided what is the change in thermistor resistance if temperature rises from 21 C to 30C? The ohm values for resistance are 120810 for 21C and 79,422 for 30C. I just subtracted the two numbers and got -41,388 ohm. I hope that's right! 2.) This lab involves a spool...

Hello, I came across a type question and my prof never went through it in the class and unfortunately I couldn't find it in the textbook nor on the internet. I can find the equivalent capicitance of capacitors in a combination of series/parallel no problem, however when a resistor is thrown in...

Okay. I have been at this for two nights now. I want to derive, step by step, the equivalent spring constant of a Beam cantilevered at both ends with a loading at its center. Here is a schematic with A=B=L/2 Now I would like to use superposition to find the deflection at L/2 due to the...

1. Let O be an open cover for [a,b] and let x=sup{d|[a,d] can be covered by finitely many elements of O}. Clearly x>a. If x<b or x=b, then there is an element O_1 of O which is a neighborhood of x, and there is an \epsilon>0 such that x-\epsilon is an element of O_1, and since there is a...

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...

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...

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. I have studied some info on this subject on the net. Even though the physics of Hysteresis...

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?

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...

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...

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...

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

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) =...

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}.

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 +...

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...

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...

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...

Homogenization of a plate to an equivalent rod... Folks, I have a doubt... Sorry if it is a really stupid one...:rolleyes: 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...

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...

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...

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...

Well, is there? :shy:

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

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

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...

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...

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...

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...

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...

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...

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

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

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