# Questions tagged [passive-networks]

Use this tag for circuits that only contain passive components, such as resistors, capacitors, and inductors. This includes RC, RL, LC, and RLC circuits.

496 questions
Filter by
Sorted by
Tagged with
11 views

### What does it mean, for poles and zeroes to alternate; Foster's Theorem

I'm currently learning Foster's reactance theorem; The most general driving-point impedance Z obtainable by means of a finite resistance-less network is a pure reactance which is odd rational ...
70 views

### Struggling to get an amplified sine wave over a small inductor at low frequencies

I am building a power amplifier circuit to amplify a sine wave over an inductor from a function generator. However because the inductor is small and i'm running at a low frequency I am getting ...
61 views

### Measuring the quality factor RLC circuit

I am trying to get the Q factor for this circuit but I don't know how to simulate it properly. I did a frequency sweep from 1 Hz - 30 MHz. The oscillating frequency is 16 MHz. I can't get the ...
61 views

### Help me see if I understand this RLC circuit

The switch closes at t=0 I need to determine the current and the voltage of Capacitor at t=0.25s at t<0 the switch is open there is no current and no voltage at t=0 the switch closes the current ...
67 views

### Capacitors capacity in an RLC circuit that is in resonance [on hold]

So if its in resonance that means XL=XC right? anyway thats how I started I∠=Irms∠=7.07/sqrt2 ∠30° A ω=10^3 Z1=R+jXL=1+1∠90°=sqrt2∠45° Z2=-jXC=1∠-90° Ztotal=(1/Z1+1/Z2)^-1=sqrt2∠-45° U∠=I∠*...
101 views

### How does the second order time constant affect circuit behavior?

I learned that the transfer function of a second order circuit can be expressed in the following standard way: $$\frac{K}{\tau_s^2 s^2 + 2 \zeta \tau_s s + 1}$$ Where: $K$ is the gain $\zeta$ ...
46 views

### Are these valid transformations, Please guide

Please help check if the transformations in the pink are allowed, when solving a circuit. For the given circuit the goal is to find the current I1 which could be found using nodal without taking care ...
178 views

### Is my circuit solution correct?

simulate this circuit – Schematic created using CircuitLab I have to calculate the energy of the inductors magnetic field at t = 6 ms. I am given: E = 50 V, R1 = 10 Ω, R2 = 15 Ω, R3 = 20 Ω and ...
55 views

### I have to find all the voltages and current in the circuit

I am given Uab=100V XL=6Ω XC=3Ω R=4Ω This is how I started X=XL+XC=9Ω Ztotal=sqrt(R^2+X^2)=9.84Ω Zab=R+jXL=4+j6=7.21∠56.30 I=Uab/Zab=100/7.21=13.86A but obviously I made a mistake somewhere ...
70 views

### RLC circuit: how to find voltage/current derivatives and derive differential equation

Trying to resolve differential equations for RLC-networks, I'm always stumbling upon the voltage/current derivatives. Here I would like to give two examples from the same textbook and explain my ...
36 views

### Differential equation for a notch filter RLC circuit

I'm trying to write and solve a differential equation for this simple RLC notch filter and I'm not sure what I'm doing wrong. simulate this circuit – Schematic created using CircuitLab So ...
69 views

### Parallel RLC Circuit: how to write differential equation?

Please consider the following circuit: At t>0 this circuit will be transformed to source-free parallel RLC-circuit, where capacitor voltage is Vc(0+) = 0 V and inductor current is Il(0+) = 4. Now is ...
100 views

### What are AC and DC transients, rather do we even classify transients that way?

We are provided a syllabus in our university stating "Unit III - Transient responses of RL,RC,RLC circuits, DC and AC sinusoidal input". As far as I can see, "transients" are the response a circuit ...
58 views

### Find Io(t) of RLC circuit (from Electric Circuits, Nilsson )

My question is from the Electric Circuits, Nilsson 10th edition. My solution is For $t < 0$, we get $i_o(0) = 2 \mathrm{A}$ and $v_o(0) = -400 \mathrm{V}$. For $t > 0$, the circuit ...
29 views

### Should we include Source and Load Impedance while calculating two port parameters?

While calculating the $Z$, or $Y$ or $h$ parameters of a two port network, should we include the source impedance and load impedance or not? In other words, for finding $Y_{11}$, we short the ...
74 views

40 views

### AC signal analysis: Voltage dip (amplitude dip) at time = 0

I'm working on a series RLC problem where the input voltage is a sinusoidal function for all time. The catch is, for t < 0, the sinusoidal function is of greater magnitude than t >= 0. There is no ...
94 views

### How to solve infinite grid with the observing terminals at diagonal of infinite square matrix?

The answer given is 2/3ohm solution is not given but I can expect how they got that answer but can't justify the way.
87 views

### Butterworth passive filters normalized values equation

Recently I'm reading in-depth about butterworth filters, more specifically about the normalized values the tables give. Most of the tables give you the normalized values for the case of RL/RS=1 or RL/...