Load Definition and 1000 Threads

I am trying to simulate the inrush current in a transformer when it is at no load, using the software Powerfactory. I get the Magnetization current, and it is what I was expecting. But I get confused when I draw the phase current, because as the trafo is at no load... should not be the same...

Homework Statement This is a question refer to a transistor in a common emitter configuration. And this is the table with data of Vce and Ic at certain range of Ib stored in microsoft excel, and the graph is plotted within the file attached(in another tab)...

Hello All, I am in the process of creating a 33' tall chaotic pendulum, and cannot find any calculations for the buckling strength of pipe. The pendulum swings from side to side, but is stopped as it goes too far one way or another by a limiting cable attached to a sleeve over the pendulum...

Homework Statement Homework Equations ƩFy=0 ƩM=0 The Attempt at a Solution Finding the reaction at A: ƩFy=0: A + (L*w0)/6 - (L*w0)/2 = 0 A = (L*w0)/3 ƩMA=0: MA - [(L*w0)/2]*(L/3) + [(L*w0)/6]*((2L)/3) = 0 MA = (w0*L2)/18 For the shear and bending moment: ƩFy=0: (L*w0)/3 - (x*w0)/2 +...

What is the definition of "Engine Load" A lot of things I have read make reference to engine load but it is not clear if there are different meanings. One definition seems to be that the engine load is the amount of air flowing through the engine as a percentage of the theoretical maximum...

Hi all,I just started to learn mechanics so please forgive me if i ask something elementary.I have an example from Egor P Popov's Engineering mechanics of solids.(Please refer attachment and sorry about quality of drawing). This is a problem of a pin joint system subjected to vertical load...

I am looking to find the reaction forces on the bottom of the rectangular shape I have included (sorry for the crude diagram). I have a moment on the top right beam (390600 lb/in) and a distributed load of 160 lb/in across the entire surface of the top of the rectangular prism. I am looking...

The DDR3 1333 is relatively cheap, so I'm thinking about buying a server mobo that can stock up to 64 GB of RAM (2^64 enables that many address lines, I suppose?) Then I can pre-load the entire windows into the RAM, so : Advantages: super-groovy and sweet just to think about lightning fast...

OK... so my understanding is that a DC generator under no load generates high voltages without any current, but does the same hold true for an AC alternator? What happens with current when the RPMs of the alternator exceed what is necessary for the current requirements?

Hey guys, I am new to the forum and came to here to ask for help on a project that I am trying to construct. I have 3 lithium polymer batteries, one 7.4v, 11.1v, and 14.8v. The current draw will be around 150a for an extremely short period of time (a couple milliseconds) and then will settle to...

So I've got myself set up for a pretty daunting first year. My courses: Calc I Phys Calc I Gen Chem I CPSC Programming Engineers CPSC Engineering Graphics English I (Actually very hard) Now I think I'd be able to pull off a decent/good GPA if I sacrifice my life completely...but I...

Hello, I am trying to calculate the permanent load on a slab of 1.6m x 1.4m x 0.05m stainless steel that is part of a structure of 8 plates. The structure is a rolling bridge, link below http://1.bp.blogspot.com/_-zOrAL1V5Jg/S6XanJMpPXI/AAAAAAAADhU/a86tki4c_YY/s640/rolling+bridge+1.jpg...

I have a N-ch Mosfet load switch that connects to a WiFi module on a circuit board. When the switch is turned OFF, I still see a voltage of 1.4V at the load. Ckt attached. I decreased the bleed resistor from 1k to 100 ohms. The off voltage decreased to 1.1v. This doesn't happen with other...

Homework Statement In the circuit shown, a load having an impedance of 39 + j26Ω is fed from a voltage source through a line having an impedance of 1 + j4Ω. The rms value of the source voltage is 250V. a) Calculate the load current IL and voltage VL b) Calculate the average and reactive...

I currently attend a quarter based college in Washington. My adviser suggested taking Diff. Eq's, Linear Algebra, and Physics Waves and Lab in one quarter. Would this be a good idea or not? I am smart, but not a Sheldon Cooper lol. Any advice would be much appreciated!

How does one go about triggering a switch (i.e. relay) via a resistive load in an AC circuit? For instance, if I have an AC relay (high impedance) and put the coil in series with the resistive load, it won't work: the resistive load will stop working. How does one go about triggering a relay...

Hello, From what I've read in the stickies, this question may be more suited to this homework forum, although please note I'm not a student nor is this homework (it's simply for a personal project I'm doing), so please accept my apologies in advance if there are significant gaps in my...

Hi everyone, For current project at work I am looking into possibility of simulating deformation from impact with static force. Here is the input data: A ball of 0.5 kg at speed of 25 km/h crashes into a damping foam which is placed on a rigid wall. Stopping (deformation) distance in the foam...

Homework Statement For the circuit shown, what value of ZL results in maximum average power transfer to ZL? What is the maximum power in milliwatts?Homework Equations P max = (VTh)2/4RL Thevenin, Norton procedures, voltage division, current division, etc etc The Attempt at a Solution This...

Homework Statement consider the following circuit: a) Determine the value of the resistor, R so that a current of 0.5 A flows through the load. b) What is the maximum value of th load resistor? c) If the load resistor is 10Ω, what value of VB will put the transistor into saturation? Homework...

Hi everyone, quick and hopefully simple question, I was wondering is it a bad/good idea to take one or two courses in the summer to have a slightly reduced courseload during the school year? And how does this affect chances of graduate school and scholarships etc? Thank you!

Firstly, does a stress vs. strain graph for a material always take the same general shape as its load vs. extension graph (with the same important points, e.g. UTS, having the same shape and corresponding to the same thing)? Secondly, what do the stress-strain and load-extension graphs look...

Homework Statement An Unbalanced 3-phase star connected load has the details as below. Line Voltage=400V Voltage R-N = 230V 0° Voltage B-N = 230V +120° Voltage W-N= 230V -120° Impedance R-N = 100+J36 Impedance B-N = 102+J0 Impedance W-N = 50+J0 A.) Determine the neutral...

I recently took a crash course that included some topics in fluid mechanics. I learned that you can use the concept of impulse and momentum the calculate the force of fluid, for instance a jet of water on a turbine blade. The equations used are: ƩFx = ρQ(Vx1-Vx2) ƩFy = ρQ(Vy1-Vy2) I...

Homework Statement Simple question: is the effective voltage of an idealised full-wave rectification not simply the rms voltage, as it is with the original AC waveform? Backgound... In an electrical apprentice program I am being instructed to use average DC voltage to calculate power in a...

Homework Statement From the average power consumed by the lamp in a light dimmer circuit connected to 240V AC main, What is the expression for RMS voltage, calculate the range of values of the delay angle α,(i)RMS voltage (ii)RMS current in the lamp, (iii) the average power if its nominal...

Hello there, I am wondering if some specilalist would point in me in the direction of procedures to determine the load in a fiber in a composite material made of aligned fibers (let's say at alternating angles $$+/- \alpha$$). I understand you could simply compute the strain in a convenient...

Homework Statement A transformer has 400 primary coils and 200 secondary coils. The primary voltage is 200 V, and the current is 2 A. A lamp is connected to the secondary coil. The efficiency of this transformer is 50%. Find the resistance of the lamp. Homework Equations V=IR η=P in / P out...

Hi there attached is a task where i had to calculate the value of the load using kirchhoffs law I would be grateful if someone can check this to see if its correct, its part of an assignment question.

Hello, I have Omega made load cell with 150g capacity,Rated output 2mV/V, Excitation 10V.How I can convert voltage values to the force (Newtons)?When no force applied meter shows 0,06V and then i pressing with finger the max value I get is 0.7V.So how I can converts those volts to Newtons now?

Homework Statement I have got this scheme: Alternating voltage V = 120 V, Total resistance of wires Rw = 0.6 Ω Current is 100 A, ratio 1:5 and 5:1 (as we can see it in the scheme) Have to calculate dissipated power in the load (Pl), dissipated power in the wires (Pw), total dissipated power...

Hello, I've been playing with transistors on a circuit simulator and found that it doesn't matter on an NPN transistor whether I put the load on the collector or emitter side, the load still has the same current flowing through it. The same is true for the PNP transistor, however when I...

Is there a mathematical equation for calculating the load angle of a generator? I'm trying to calculate the real and reactive power of the generator which the equation I am using is EV/Xd sin delta where E is the generator excitation voltage V is the generator terminal voltage Xd is the...

A balanced 3 phase load is rated at S=10KVA and 500V. The device is operating at 90% nominal voltage and 100 % line current. The question is: if the load is delta connected, find the phase current in per unit and SI units. I calculated correctly that the per unit line current value is...

I have a partial linearly distributed load on a cantilever and would to determine the bending moment distribution along the beam. I usually do this by taking cuts along different sections of the beam and finding the expressions for shear force and bending moment. However when I do this...

please see attachment FEET PSI. I am looking for the total load in psi on each leg/foot. thanks very much

First, I am not an electrical engineer and am not to familiar with circuit boards. PROJECT: I have a static load, represented by a block. The block has three very short legs (or feet 3/8" diameter each). The feet are located concentricly under the block. Under the feet I place three thin-film...

Which wood cross sectioπ caπ carry hïghest uπiform load Homework Statement Homework Equations Moment of inertia for rectangle I=(1/12)bh3 τ=(VQ)/(I*b) σ=(MV)/I The Attempt at a Solution I started by finding reactions at B and C Then drew the sheer and moment diagrams (to save...

Hello, I have a system that consists of a clamped-clamped beam with a residual stress and am trying to find an equation that governs its deflection due to a point force that takes stress into consideration. A formula I have come across: d = (F*L^3)/(192*E*I) does not accurately model the...

My choice of solid state Dc circuit breaker is the Mosfet, easily available( i got loads!) i want the mosfet to interrupt the circuit to protect the load from overvoltages This is what I've done so far, please help its not working the way i want it to. note to mods: i also put this...

My choice of solid state Dc circuit breaker is the Mosfet, easily available( i got loads!) i want the mosfet to interrupt the circuit to protect the load from overvoltages This is what I've done so far, please help its not working the way i want it to. the resistor connected to the...

Ok, I have a question pertaining to the load a Macpherson strut tower sees VS. the load a particular double wishbone car sees. Basically since the macpherson strut is required to hold the weight of the car and control the cornering forces imparted through the tire/ upright, I was under the...

Homework Statement http://imageshack.us/a/img27/7043/homeworktest2prob5.jpg Find the load current IL (in microamperes) in the circuit.Homework Equations V = IR KCL, KVL, voltage division, current division,Op-Amp Output V = (Gain)(V+ - V-)(Gain) = -Rf / Rin The Attempt at a Solution I'm not...

Homework Statement https://dl.dropbox.com/u/3405118/24-02-2013%2018-46-54.png Find (a) the open-circuit voltage VL , and (b) the voltage across the 5 ohm load, by the following methods. Method 1: Direct approach. First find the open circuit voltage by simple ‘potential divider’ approach (but...

How does the mass of a toroidal top load on a Tesla coil affect performance, assuming all dimensions are similar except for mass? You see, I have one hollow aluminum torus and one torus made of heavy, mostly solid metal. Both same size, but different weights. Thanks!

Homework Statement http://imageshack.us/a/img831/2617/homeworkprobsg213.jpg Find the load RL that will result in maximum power delivered to the load of the circuit. Also determine Pmax deliveredHomework Equations V = IR, KVL, KCL, voltage division, current division Thevenin procedures,Pmax...

Homework Statement Require various values from cantilever beam analysis including Bending moment K stiffness 2nd moment of inertia Max stress Homework Equations Shown belowThe Attempt at a Solution Here is my attempt at this question but I am unsure about units and therefore my answers?Bending...

LOOKING FOR WEIGHT/MEASUREMENT DEVICE: DOES ANYONE HAVE ANY SUGGESTIONS? Please bear with me. I think the best way to present this is to post my RFQ and that will, I hope, explain what I am looking for. AN ALTERNATIVE TO A NORMAL LOAD CELL, WHICH WOULD HOPEFULLY BE MUCH CHEAPER, WOULD BE...

Homework Statement This isn't homework, but I thought I would post it here as maybe more people would see it, and as I am not an engineer, it requires someone with more experience. The section is effectively an I beam with a hollow u shaped fitting along the top (see my rough sketch). I just...

I was wondering if someone could have a look at my calculations. I believe I'm on the right track but I keep getting wrong answers, but I might be mixing + and - somewhere. I'm also a little unsure about the right way to incorporate the force working on top of the beam. The task reads: A...