# Questions tagged [phasor]

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55 views

### RC circuit - phase current

I have a simple RC circuit as below : I'm trying to visualize current curve and voltage curve (Vout and I(R1)) vs Vin using LtSpice and I obtain the result below: It's OK that the Vout is leading ...
56 views

### can I also use phasors/concept of impedances for non sinusodial signals?

I know that phasors are great to solve circuits driven by sinusodial input signals but I was wondering if I can incorporate phasor concepts(like impedance) to circuits driven by input signals not ...
52 views

### Complex impedances of capacitors/inductors in the phasor domain

I'm trying to verify the complex impedances of passive components in the phasor domain (not s-domain). Take for example the inductor, whose element law is $v = L \frac{di}{dt}$. Assuming a complex ...
45 views

### Resonant frequency and maximum signal width

I've seen resonant frequency being defined as the point where the input signal is in phase with the output signal (So reactance/susceptance is 0). However conceptually, teaching material seems to link ...
17 views

### Direction of current in Phasors Analysis

I'm learning AC circuit and phasors form. In the exercise below, when using nodal analysis they choose the direction of current flow in the circuit then calculate the result. But I wonder why that ...
33 views

### Finding the total impedance and voltage across open terminals

The question that I'm trying to solve is the following: In the circuit shown below, what is the total impedance in ohms across the open terminals? What is $v_{T}$ if $v_{L}$ is 80 vrms? This is ...
49 views

### Calculating Phase angle from instantaneous voltage

For background info I am an EE/CE that is 10 years out of school and has since worked writing firmware and dealt mostly with digital communications and signals, so now I am having to reach back to my (...
69 views

### How can current be in different phases in the same wire at the same time?

We know that either in ideal or practical transformer in no-load condition, the exciting current has two components Ic(core loss component) and Im(magnetizing component). Now since the same current ...
35 views

### Rotating magnetic field discrepancy

This may be a noob question Lets consider a balanced 3 phase supply namely \begin{align} R&= V \sin(x)\\ Y&= V \sin(x-120)\\ B&= V \sin(x+120) \end{align} At a neutral point we would ...
59 views

### How to calculate voltage across capacitor C1?

If the voltage $v_I = \frac{jωC1R3}{1 + jωC1R3}*Vs$ does that mean the voltage across the capacitor would be equal to $v_S - v_I$ ?
101 views

101 views

### Odd step in derivation of phasor Telegrapher's equations

In the derivation of the phasor form of the Telegrapher's equations (in "Fundamentals of Applied Electromagentics" by Ulaby), there is a step I'm not following: When going between eq. 2.16 and eq. 2....
405 views

### Working of a Doubly-Fed Induction generator (DFIG) in wind turbines

I am unable to understand how a Doubly-Fed Induction generator works (in Wind Energy conversion system)? I do not understand how the reactive power fed into the stator interacts with the rotor so as ...
127 views

### Simple phasor problem with AC

Simple problem that I can't solve. On this AC circuit, find the current read by ammeter $A_3$ (the one in series with the resistor) given that $A_1$ reads 4A and $A_2$ reads 3A, assuming ...
54 views

### State estimation in power system [closed]

Regarding state estimation in electrical power grid, does the voltage phasor magnitude at each bus(P-Q bus and P-V bus) considered as a static state variable or a dynamic state? I am a little bit ...
205 views

### For an ideal Capacitor, when is the current leading and when is the voltage leading by 90?

Say I have a purely restive load as a reference in parrallel with an ideal capacitive load. I know that the current through the capacitor is said to be leading by 90 degrees. Specifically though, what ...
1k views

### Confusion with interpreting leading and lagging concepts for given electrical quantities

I have a confusion interpreting the lagging leading concept when it comes to time plots. I think in phasors I can see which one is leading or lagging. For example in the below phasor diagram: How I ...
102 views

### Why can't phasors be equated to a sinusoid?

I'm having trouble understanding why a phasor for an AC sinusoid, let's say voltage (represented as Vrms/_50° for Vsin(ωt + 50°) to a current, for example) cannot be equated to the sinusoid in ...
3k views

### Voltage drops are greater than source voltage. How is it possible?

This circuit was given in my textbook. The source voltage is only 10 Volts, but the individual voltage drop across resistor and inductor are 6 Volts and 8 Volts respectively, which is greater than the ...
80 views

### Phasor representation

How did we separated/broke down this phasor expression?
105 views

### ac phasor voltage between capacitor and inductor higher than source voltage?

I've just learned about phasors and I am very confused about this. Take this circuit as an example: simulate this circuit – Schematic created using CircuitLab So by what I've learned, All I ...