Load Definition and 1000 Threads

is that star load will make unbalanced , delta will not? THX

(a) The steel cable to the hoist is 15m in length and has a diameter of 25mm. Its steel has a maximum permissible working stress of 200N/mm2 and a Young’s modulus of elasticity of 210,000N/mm2. The maximum load allowed on the hoist is 75kN. Determine the following:- (i) the cross-sectional...

Homework Statement The current-voltage characteristic of a photovoltaic energy converter (solar cell) shown in the attached figure can be approximated by: i = I_1(e^{v/V_{TH}} - 1) - I_2 where the first term characterizes the diode in the dark and I2 is a term that depends on light...

this falls into civil engineering, but as we all know everything boils back to physics. and, i couldn't find any good civil forums to join. so, i have a basic Q but need help understanding some things. 1) i am building patio cover approx 50ft long x 14ft off the house. it has a pitch...

Hi Would anyone be able to give me some guidance on creating a step load in Simulink, I need this type of loading to observe frequency (slew rate) when a diesel engine with voltage control drives a asynchronous motor. I have most of the circuit built and am using Sim power systems mat lab v12...

Hi. Most grateful for your suggestions on the following. My generator is a Stamford/Newage 125 kva, 1500 r.p.m., 174 Amps, 415/240 Volts rating and power factor is 0.8. The load comprises 36 heating elements, each element rated at 6Amps/ 240 Volts (1500 Watts). I have divided the elements into 3...

I am working on a project. could you please help me in piezo crystal. I just want to know the load vs current values. on what load the respective value of piezo crystal??

Hi everyone, So I have time-varying force data. The force acts as a concentrated load. The force does not vary periodically/harmonically, it just has a general variation with time. My main question is: How do I determine the corresponding frequency of this force data? Also, if I'm...

If there is a uniformly distributed load due to gravity on a truss, how do I convert this into point forces on the three pin joints on the truss? I am having trouble trying to work it out as I'm pretty sure there will be both forces in the x and in the y for each of the joints, but I can't...

Homework Statement http://imageshack.us/a/img62/5467/homeworkprob14.jpg A. Find the no-load voltage of V0 B. Find Vo when RL is 450 kΩ C. How much power is dissipated in the 30 kΩ resistor if the load terminals are accidentally short circuited D. What is the maximum power dissipated in...

A Wheel of a self balancing skateboard of radius 7 cm is rotating at 2600RPM with torque for motor is 1.76Nm,current is 10.4Amp and 24v and total load is 90kg (10kg for skateboard and 80kg for user). What is the speed of self balancing skateboard the in km/hr with load?

According to classical physics, if I take an electric motor with a resistance of 1 ohm, and run 10 volts through it, 10 amps of current will run through it. But through experiment, a lot less current will run through the motor, an average brushless motor with a resistance of less than a milliohm...

Hello everybody, and a happy new year! Found in Dubbel (Taschenbuch für den Maschinenbau) page C47 7.3.2 the axial load that buckles a thin cylindre. This is not Euler's buckling of a long compressed beam, but probably from Timoshenko's theory for shell buckling applied to a thin cylinder...

I'm working on my analysis of roof truss assignment and got stuck on the computation of dead loads having no value for metal furring load. I only have the value for wood furring which is 0.12 kPa. I've been searching in the internet but still I'm not able to find it. Thanks in advance.

Hey all, I am currently a sophomore in Physics with a Math minor. For this upcoming semester I will be taking 13 credits towards my major/minor: Physics III (mostly waves and optics), Mathematical Methods for Physicists I, Introductory Modern Physics (special relativity and quantum theory...

Hi All. I am looking to determine the torque/power/rpm. needed to lift a 4 kg. load 150 mm vertically in 10 seconds. I need to use a 6 volt dc. gear motor mounted vertically and connected to a 12 mm dia. acme lead screw ( steel ) with a 3 mm pitch and 48 % efficiency...

Hi. I am trying to design a common emitter amplifier with a current source as an active load. Currently I am simulating it in SPICE using an ideal current source with an NPN transistor. I have the emitter connected to ground, the input signal is applied at the base and the collector as the...

The load line of transistor depends on resistor of base or resistor of collector ? Or both? thank

Hello, From what I have read, the glycemic index is a limited tool because it doesn't take the amount of ingested carbs into account, hence why the glycemic load was created. But then I read an example that threw me: a serving of 10g with an GI of 100 is equivalent to a serving of 100 g with a...

I have a solar cell that is rated 3.6 amps .5 volts 1.8 watts when you take a ammeter it does put out 3.6 amps, but this is basically a dead short reading. What I want to know is these cells put out .5 volts using ohms law how much resistance is needed to have a voltage output of .3 volts so you...

Hello, I'm trying to find out how much energy an induction motor pulls over a 24 hour period when connected to a resistive load. The only data I have are the specifcations of the motor, so I can estimate how much energy it will draw based on what capacity it might be running at. Really...

The question and my attempt have been provided in the attachments...my problem is trying to find the differential gain, i have worked through to an answer but the answer I'm getting doesn't seem correct...also i have absolutely no idea how to derive the common-mode gain...any help is much...

Sorry if my English is bad. We're building bridges and learning about truss and truss variations, but I'm still confused as to why the triangular shapes work best and what they achieve. How would I know side would be compressed and which would be tense? We have to build a bridge using roughly...

Homework Statement A load absorbs 58959W at a lagging power factor of pf = 0.73. If the current flowing through the load is ix = 0.001A-rms , determine the impedance of the load. Homework Equations Ohms law Impedance/Voltage/Power Triangles The Attempt at a Solution If the load...

Under no load, does an induction motor run exactly at its synchronous speed (i.e. relative field speed) or at a speed that is close to the synchronous speed but slightly less? Thanks for your time.

If I had a step down transformer of 300 VA in size at 45-0-45 Volts@3.3 Amps with a regulation of 10% could I do the following to calculate the internal resistance of the secondary winding for my power supply circuit? Voltage * Regulation 10% to work out the voltage difference between noload...

This is a specific case involving a Jaguar, but any help on the correct way to find the radial axial and torque loads in a moving cars wheel would be greatly appreciated. Thanks in advance Homework Statement Estimate the worst case radial, axial and torque loads on a wheel. Mass of...

What is the load line equation for I-V Characteristic plots? Why is load line slope negative? According to Ohm's Law: i = V/R; so as voltage increases current increases then slope should be positive, right?

Homework Statement A turbine generator is delivering a 20MW load at 50Hz, to a local load.; it is not connected to the grid. The load suddenly drops to 15 MW, and the governor starts to open the steam valve after 0.5s. Calculate the frequency to which the generated voltage rises, before the...

In order to draw the load line of transistor, we have to find out the saturation current (where the voltage is minimum or zero) and voltage of collector-base when collector current is zero. In order to calculate maximum saturation current, we have to forward biased the base-emitter, and...

1. Homework Statement I have a bar, 500mm long (0.05m) 10mm wide (0.01m) and 3mm deep (0.003 m)The bat has a load applied in the centre of 30nI know the maximum yield stress is 150 mpa 150x10^6How do I calculate the maximum load the bar can take?2. Homework Equations I used stress = m y / I3...

Homework Statement I have a bar, 500mm long (0.05m) 10mm wide (0.01m) and 3mm deep (0.003 m) The bat has a load applied in the centre of 30n I know the maximum yield stress is 150 mpa 150x10^6 How do I calculate the maximum load the bar can take? Homework Equations I used...

My apologies, I don't own a scanner or else I would show the 200 variations of formulas I've played around (my work) with all day to get these answers. Question is this; A short compression member is fabricated from 2 steel pipes. the pipe on the top has a cross sectional area of 3.17 in sq...

I had some general questions related to hashing. 1. Load factor in a HashTable is when you want to increase capacity of buffer. Is there any advantage/disadvantage of setting the loadfactor less than 100% vs setting load factor at 100%? 2. When you increase capacity, you have to rehash all...

I'm trying to figure out how multiple AC sources which are in phase would be able to be used sequentially to power a load. This all started as I read some literature about solar PV panel systems which had a wiring diagram to tie output from the inverters directly into the electrical panel split...

I'm just learning how to use Ansys Workbench 13 to analyze static structures. I need to analyze the deformation of a simply supported beam with a concentrated force in the center vertically downward. I have a 3D model of this beam created in Solidworks. How do I create a force in the center...

Homework Statement Determine the forces of reaction.Homework Equations SUM of Y forces=0 SUM OF FORCES ABOUT POINT B = 0 The Attempt at a Solution My attempt is in the link, I scanned the diagram along with my work. Thanks for the feedback, appreciated. http://imgur.com/i3cB2 <----- Link

OK. I hope this question is acceptable here. I am studying to take my Ham Radio License Technician's Class exam and I am not sure about the topic of load impedance and load in general. I looked up "Load impedance" on wikipedia, I'm confused This sentence "when a high power appliance...

For those of you who have done undergraduate research at your home institution during the fall or spring semester, what was your average number of credits taken during that (or those) semester(s). I had read somewhere that the time commitment for undergrads was generally 10-20 hrs, depending on...

Next semester I am looking at taking 12 hours of math intensive courses, would it be wise to stay with just the 12 hours, or would it still be possible to take another Gen-Ed or humanities course? The courses are: Calc 3 Linear algebra Chem 2 Calc based Physics for science majors.

Homework Statement Design a load which draws an average power of 25 W at a leading PF of 0.88, with Vrms = 120 V @ 60 Hz. Homework Equations P = VIcos(\theta-\phi) Q = VIsin(\theta-\phi) S = P + jQ |S| = VI The Attempt at a Solution Since it has a leading PF, the load should be...

I'm planning to work on a water cooling device for physiotherapy using a peltier. For this, I should be able to cool 500 g of water at a temperature of 35°C to 18° C. This gives me a heat load of 315 Watts if I take time to be 3 mins. Is it possible for a peltier to work against such a...

I am using an isolation transformer in a VFD circuit to prevent a GFCI from tripping (due to harmonic noise getting back on the line.) This solved my GFCI problem, but brought about another issue due to the inrush current the transformer created on this circuit. Due to UL requirements, i...

Homework Statement One Thevenin theorem result is that the maximum power across the load resistor in the equivalent circuit (and therefore the real circuit) occurs when RL = Rth. Start with the result that the power dissipated by the load resistor is I2RL and prove this result. Homework...

Homework Statement The indicated location of the center of gravity of the 3160-lb pickup truck is for the unladen condition. If a load whose center of gravity is x = 21 in. behind the rear axle is added to the truck, determine the load weight WL for which the normal forces under the front and...

Hi, I did an experiment, involving transformers. Where we did open circuit and short circuit tests then test with a resistor, capacitor and inductor. For the last question it asks Calculate the load capacitance and inductance from the voltage regulation readings. Voltage regulation...

Homework Statement A 3/4-in.-diameter rod made of the same material as rods AC and AD in the truss shown was tested to failure and an ultimate load of 29 kips was recorded. Using a factor of safety of 3.0, determine the required diameter (a) of rod AC, (b) of rod AD. Homework Equations...

Have a 15 HP motor whose full load current (@ 50 Hz - India norms) is calculated at around 21 Amps. Have added a VFD (Variable Frequency drive) and would like to always run the machine @ 90% of full load current for maximum efficiency. Can anyone assist in helping me calculating full load...

Hello, Im using DC motor to run the conveyor but suddenly the armature shows high current 130 A for 30 V power and the speed can't increase anymore. The motor power stated in the name plate is 93.8 KW, Armature voltage is 453 V and Armature ampere is 225 A. The motor can run free load after...

Is this too much of a load?? I'm thinking of taking 5 classes this Fall semester: Real Analysis 1 Economic Statistics Applied Regression Analysis Computer Science 1 with lab Marketing Principles and Policies Total would be 16 credit hours (CIS is 4 credits). I'm a math major with a minor in...