Phasor Definition and 143 Threads

Homework Statement I have attached the problem and all my work. If someone can check my work for part a, that would be great. As far as part b, I need the most help here. Finally for part c, I think my work so far is correct, but I need help to graph it. Thank you in advance. Homework...

1. I was just wondering WHEN i would use the graphical method to add phasors using cos law or sin law given inductors current lags voltage by 90 degrees and capacitors current leads by 90 degrees. When would i solve the problem graphically and when could I just use modified nodal analysis? when...

Finding voltage across elements in phasor diagram, URGENT! Hi there, first time posting here, just caught up on a question with no worked solutions and it's driving me crazy! I've attached the question below,and the answer to b is v(t)= 5cos(2t-112). I can do part a but am struggling on...

Homework Statement From this diagram (see the attachment) I have to draw the phasor diagram showing the various voltages and current of balanced 3-phase resistive-capacitive load. Homework Equations I know from the capacitive current lead voltage by 90 degree The Attempt at a Solution...

OK, Hello! Have to make sure as I felt like I knew my stuff but failed my first exam, am I on the right tracks? Power Factor = Cosine of phase angle Phase angle = Tan Inverse ((XL-Xc)/R) (So you know) XL= Inductive Reactance Xc= Capacitive Reactance R = Resisstance Am I...

how is euler's formula useful? it must have something to do with converting from the time domain to the phasor domain and back, but i can do that without euler's formula

Impedance -- Current phasor In a series circuit of two elements, the voltage and current, for w = 2000 rad/s, are V = 150|-45° and I = 4,74|-116,6°.That variation in the frequency of the source would result in a phasor current of 6 amps? Assuming an unlimited variation in the frequency, what is...

we know that phasor voltage, current and impedence can be represented by vector. we know phasor v is equals to the product of phasor i and impedence. the what is the process of multiplication? is it dot or cross product?

Homework Statement The frequency is 50Hz (we've been told to always assume in our class that the frequency is 50Hz) and thus omega is 100pi. The Attempt at a Solution I don't have time to scan an image of my attempt (complete attempt) however what my query is: the way i went about to answer...

EDIT I mean nodal, not mesh analysis xD http://img205.imageshack.us/img205/5931/omgt.jpg http://img694.imageshack.us/img694/2570/omg2p.jpg Are my are my equations correct? Here is the solution according to wolfram...

If you have a phasor that has a negative magnitude (ie -3<38degrees) what is the best presentation. I believed it was just erasing the - sign and adding or subtracting 180degrees. Correct me if wrong

oiler formula says cosx+isinx but here they multiply by minus the imaginary part of the phasor representation the coefficient of sine is minus the imaginary part why??

http://i47.tinypic.com/2mg2iyf.jpg i ant to find the current in phasor representation. i made found the Z total 210+j232.5 the current sourse is 2170 I=\frac{2170}{310+j232.5}=1454.56-j1610.4 but the calculation igives another result why?

What's the difference between the two? RMS is divided by square root of 2?

Does anyone know why a phasor consists of the magnitude of a voltage multiplied with a sinusoid? For instance, V_Scos(\omega t + \theta) I am searching all over the web, and cannot find a general explanation why. I've found some incomplete...

Homework Statement I am not sure what a phasor is. So when I looked it up on google, it simply said it was a sinusoidal function where A, \theta, \omega are time-invariant. I am not sure what would be good for, or any other relevant information. I also would like to know what v_x, V_s...

Can anyone please tell me what is time phasor and space phasor? and what is the difference bwt them ?

Phasor Diagrams?? Homework Statement Say I am given this circuit diagram. I have the recorded values on the voltmeter and ammeter. I can verify the power factor rating using these two values. But I also need to draw a phasor diagram for this circuit as well as two others which just have...

Draw the phasor representation for each of the following signals. Also write the signal as one sinusoid, v(t) = 20cos(200t+45°)+cos(200t) From this equation, do I have to turn to v(t) = A sin (ωt + φ) ? If yes, how can I convert it? Thank you.

Guys, Quick one, When you do phasors for AC voltages and current... is it theVrms and Irms or can it be Vmax and Imax..? I mean the magnitude of them...I am bit confused

I have been trying to interpretating the voltage and current phasors in transmission line. I want to verify with you guys/gals here what my understanding. I am using only the voltage phasor as an example. I separate phasor V(z) into V(z)+ and V(z)-. I put the load at z=0 and V(z=0) at +r axis(...

My textbook's explanation doesn't do it for me, so I have to ask here. According to the textbook: "A phasor is an abstract vector whose y-component represents the value of a wave disturbance. The vector's magnitude equals the amplitude of the wave, and the angle it makes with the y-axis...

Homework Statement Add the formulas y1 = 5.2 sin(ωt), y2 = 8.3 sin(ωt+30°), y3 = 15.5 sin(ωt+60°) using the phasor method. Your formula should only have numbers and the variables ω and t. The formula must be accurate for any value of those variables Homework Equations Not sure...

Let's say I have a field (electric or magnetic or something) and it's time-varying so I choose to represent its components as phasors. Say the field is: \vec{F} = X\hat{x} + Y\hat{y} + Z\hat{z} where, X, Y and Z are complex numbers. Now, I want to find the amplitude of the field. If...

Homework Statement An LC circuit includes a 0.025\muF capacitor and a 340\muH inductor. (a)If the peak voltage on the capacitor is 190 V, what is the peak current in the inductor? (b)how long after the voltage peak does the current peak occur? The Attempt at a Solution I've...

Homework Statement I was looking through my notes when I saw the following expression of a plane wave represented as a phasor A_{0}e^{i(\vec{k}\cdot\vec{r}-\omega t)} Now I can certainly understand a plane wave propagating along a given coordinate axis say, x or z, and the phasor...

Homework Statement Plot the following for x = 0 to 8: This is part of a larger engineering problem, but I am stuck here, I have no idea how to plot a phasor. The original function is: y(x,\,t)\,=\,2\,cos\left(\frac{\pi}{6}\,t\,-\,\frac{\pi}{4}\,x\right) Homework Equations...

Hello, What happens when phasor analysis is applied to nonlinear systems? could someone explain me how it would work? :confused: Thanks

Homework Statement Find the phasors of the following time functions: (a) v(t)\,=\,3\,cos\left(\omega\,t\,-\,\frac{\pi}{3}\right) (b) v(t)\,=\,12\,sin\left(\omega\,t\,+\,\frac{\pi}{4}\right) (c) i(x,\,t)\,=\,2\,e^{-3\,x}\,sin\left(\omega\,t\,+\,\frac{\pi}{6}\right) (d)...

Phasor representation of AC voltage and current. I\,=\,5\angle{0^o}\,=\,5\,+\,j0\,A V\,=\,100\angle{30^o}\,=\,86.6\,+\,j50\,V in general V\,=\,A\angle{\theta^o}\,=\,A cos{\theta}\,+\,jA sin{\theta}\,V and similarly for I It is assumed that the angular frequency \omega is...

[SOLVED] phasor approach question using phasor approach, determine the current i(t) in a circuit described by the integrodifferential equation: 4i + 8integral(idt) - 3di/dt = 50cos(2t + 75*) the right side is so easy to convert to phasor form, but how can i convert the left side or how to...

Tansform the following function of time into phasor form: 3 cos 600t - 5 sin (600t + 110) so I need to change the second term to a cosine term, any hints? or can I use a trig indentity that would make things easier?

Hello, came across this simple problem: Let w = 2000 rad/s and t = 1 ms. Find the instantaneous value of each of the currents given here in phasor form: a) j10 A; b) 20 + j10 A so for part a, I changed the current (0 + j10) to 10e^0 or simply 10, then my instantaneous value should be...

Homework Statement What value of \omega will cause the forced response v_0 in the circuit below to be zero? http://img248.imageshack.us/img248/1854/problem934ao5.jpg Homework Equations Phasor eqs. The Attempt at a Solution...

I need help in understanding how to convert waves from instantaneous form to phasor form: a wave expressed as E(z,t) = Eo * exp(-ax) * cos(wt - Bz) * ay How do i convert this wave to phasor form and determine its direction of propogation, phase velocity and wavelength? Thanks in advance...

for i = 0.4A cos (wt + 60) , how do we get i(rt) =0.35A cos(wt + 30) and then i(ct) = 0.2A cos(wt+ 120) ??

v(rt) = 125mV cos (wt + 60) R=250 ohms L = 250mH find i(t) in the circuit there is a inductor in series wif the resistor the answers i(t)=0.5 cos (wt+60) may i know why is it the inductor not using to form z and then only divide by v(rt) ??why only the resistor??

for phasor, v = 20V e^(-j60) and i = 0.5A e^(-j30) how can i write them in v(t) and I(t) ?? pls help thanx

I can convert sinusoids to phasors and vice versa if they are relatively simple, but I don't know how to deal with these two. (8-j3)5e^-jsomething. I was going to distribute, and make two vectors and find the resultant vector, but I don't think that's how to go about it. also Thanks ver much...

What is Phasor and Sinor diagramme? What are they plotted agsinst? And how to interpret them? I have sample pic from my textbook.

Hi Guys! well! can anybody tell me the correct way of drawing phasor diagrams of Series-Parallel RLC circuits. I know how to draw for Series RLC and Parallel RLC but don't know WHEN it comes to SERIES-PARALLEL combined. Plz help me. Plus can u recommend me any website from where i can...

Hello, now we are in phasors and I am missing something in this problem: given a circuit of indep current source (5cos(wt)), R, L (with vL(t)) all in series, no values for them, although voltage across inductor vL(t) = 3cos(wt + theta), we need to find theta. So, by using impedance for...

Can anyone direct me to some good sites describing how to construct phasor diagrams based on different circuits? Didn't have much luck using search engines.