Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network.

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Is circuit analysis really used? [on hold]

I'm currently in a first year circuit analysis course. While the concepts are relatively simple they don't seem like something you could use to design circuits. I mean it's hard enough to analyze ...
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1answer
26 views

Using Thevenin's Theorem?

Say your trying to find the Thevenin equivalent of a linear circuit with dependent and independent sources. You would find \$V_{OC}\$ (voltage across the short circuit) and \$I_{SC}\$, the source ...
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1answer
61 views

Proof of Thevenin's and Norton's Theorem?

Googling this gave me a number of proofs, but almost all of them assume the load is a linear component. Could someone give me a proof for these theorems assuming the load can be anything (a linear or ...
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4answers
80 views

Input resistance of biased amplifiers

What are the input resistances of the following biased amplifiers. I know RG1||RG2 is the input resistance of the first one. But i can't understand how. Is it RG+RD for the second one?
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3answers
96 views

Voltage across a resistor?

simulate this circuit – Schematic created using CircuitLab What would the voltage across the resistor be? What would its polarity be? I don't see anyway for KVL to not be violated.
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5answers
434 views

Why does a capacitor act like a short-circuit during a current impulse?

While trying to solve questions involving impulses and step functions, we are supposed to assume that an uncharged capacitor or an uncharged inductor acts as a short circuit and open-circuit ...
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2answers
36 views

DC resistance seen by a terminal?

I can't understand, how, The DC resistance seen by the inverting terminal of the 1st op amp is R1 || R2. The DC resistance seen by the inverting terminal of the 2nd op amp (which in fact turns ...
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2answers
64 views

Solving three impedances in series

I have a circuit of two capacitors and three resitors, where two pairs of the components are in parallel combinations: I'm trying to calculate the total impedance. Since \$C_1\$ and \$R_1\$ are in ...
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1answer
47 views

What Formality Am I Using To Isolate This Portion Of The Circuit?

If I have this circuit in which the switch opens at t = 0 (after being closed for an infinite time, making the circuit steady state), for which I'm trying to find the voltage across R2 as a function ...
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1answer
69 views

Why is Topology used to analyze circuits? [closed]

Why is Topology used to analyze circuits? Why aren't Kirchoff's laws and other laws specific to electrical engineering enough to analyze these circuits? More specifically speaking, could someone give ...
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6answers
299 views

Is there any physical device called current source?

I have seen both current source and voltage source in many electrical circuits (in paper). When it comes real hardware battery can be considered as a voltage source. Then what is a current source ? ...
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3answers
103 views

What would happen in this circuit?

simulate this circuit – Schematic created using CircuitLab If the current flows counterclockwise, the current source becomes invalid but if it flows clockwise the voltage source becomes ...
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2answers
139 views
+50

Why can't mesh analysis be used for non-planar circuits?

My book simply states this without any kind of explanation.
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1answer
36 views

Using mesh analysis?

If you're using mesh analysis, for each loop current do you have to have at least one node, where only that loop current through it? For instance, if you have 2 loop currents, do you have to have at ...
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0answers
26 views

Intuition behind why nodal and mesh analysis work?

I'm looking for an intuitive explanation (not a proof) of why the equations produced by nodal analysis and mesh analysis are always linearly independent and always have a unique solution, if the ...
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0answers
25 views

i do not understand what current actually is? Is it stream or wave ? [duplicate]

I am taking circuit analysis but it is just theory and they do not give enough explanation to understand what current or electricity actually is
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1answer
54 views

Number of independent KVL equations in a circuit?

Could someone explain why, for a circuit with B branches and N nodes, the number of of linearly independent KVL equations for a network is: B-N+1 Thanks.
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7answers
410 views

How do we know loop currents exist?

I've been practising loop analysis questions, but don't really understand why the method is valid. Say you have a circuit that only consists of resistors and some power source. Assume the circuit is ...
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1answer
57 views

How do you find the equivalent voltage of the current source in this circuit? [duplicate]

The circuit is shown at this schematic. How do I find the equivalent voltage of the current source by simplifying the circuit?
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2answers
97 views

Equivalent circuit?

Can I simplify this circuit to just one resistor? How can I find the equivalent voltage of the current source in this circuit?
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1answer
32 views

exponential term in RLC sinusoidal analysis

I was learning to work with RLC circuits with sinusoidal excitations and the book I was dealing with showed me that the responses of these passive elements to sinusoidal excitation were themselves ...
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1answer
62 views

How to find the complex power for a current source?

The relevant circuit is shown below, We should first find the complex power delivered by the independent source. I derived it but my answer was different than the answer given. So, I am wondering ...
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2answers
72 views

What's a loop current?

I just started mesh analysis, but don't really understand the concept of a loop current. The current in different parts of a loop is not necessarily constant - two parts of the same loop can have ...
2
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1answer
50 views

Circuit analysis?

So far I've learned these circuit analysis techniques for: Tellegen's Theorem Using only KCL Using only KVL Solving a system of equations that consist of all KCL equations and all KVL equations ...
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4answers
86 views

Current and voltage sources?

simulate this circuit – Schematic created using CircuitLab From what I understand, the magnitude and direction from an independent current source is constant. What would happen in the ...
5
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1answer
575 views

How can circuits always be solved?

I've just started circuit analysis. All the examples, I've seen so far involve using using KCL/KVL or nodal analysis. They all consist of setting up a system of equations and solving them which gives ...
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2answers
76 views

Why are resistance matrices always symmetric?

My book says when using nodal analysis to find the voltages and currents in resistive circuits, the resulting matrix (of the system of equations) is always symmetrical. Why? The exact quote is: ...
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1answer
39 views

How I find the current and voltage in this matrix?

My book above uses nodal analysis to find the current and voltage across the resistors. Now consider this alternate circuit: Look at the branch that doesn't any components (the second straight ...
5
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4answers
420 views

Kirchhoff's Laws and Circuits?

I just started circuit analysis today and learn't about Kirchhoff's Laws. Its pretty straightforward, but in all the examples my book gives they already specify the direction of the current and the ...
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0answers
43 views

Thevenin equivalent circuit of a non-linear driver circuit

If I am using a non linear circuit to drive a linear circuit, how do I analyze the driver? Is there a way to find the Thevenin's equivalent circuit? For example if I look at the full wave ...
2
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1answer
77 views

Series RLC circuit dynamics

I'm just getting my head around RLC dynamics. After some analysis and math i get, \$\frac{d^{2}v_{\text{c}}}{dt^{\text{2}}} + \frac{R}{L}\frac{dv_{\text{c}}}{dt} + \frac{1}{LC}v_{c} = ...
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2answers
118 views

Schematic Diagram of the circuit

I would like to know what will happen in the circuit diagram below when the switch is on( connected to a voltage source and R1) and switch off(connected to the R2) My thoughts... For switch on only ...
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2answers
96 views

Ideal operationnal amplifier with source

I was wondering... I have read about ideal op amp, that we could change this circuit : Into this one (with the ideal model), where the input resistance Ri is infinite, and the output resistance ...
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1answer
33 views

Linear circuits and what components a network can posses to account for linearity

I was studying circuit theory and electrical networks wherein I came across the theory of superposition and how superposition can be used to figure out voltages/currents in the network, provided the ...
0
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1answer
43 views

Complex power delivered by voltage source (with current source)

Given the following problem: I'd like to know how exactly one is to find the complex power delivered by the voltage source and the current source, separately, as is shown in the solutions on the ...
2
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1answer
61 views

circuit analysis of DC-source, inductance and modulated resistance

Here's an interesting problem. Consider a DC voltage source (for bias), an inductor (supply wires, for instance) and a resistor, which changes its resistance as a function of time: \$ R(t) = ...
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2answers
42 views

Explanation of the Node-Voltage Method equation in specific circuit

I'm looking at this circuit in my textbook: There are also equations for this circuit: \$ u_n(t) = R1\cdot i_1(t) + L_1\frac{di_1(t)}{dt}-M\frac{di_2(t)}{dt} \$ \$u_C(t) = ...
2
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2answers
60 views

No-break (IPS) circuit analysis and improvement

I'm building a simple circuit that resembles a nobreak operation to power portable applications. The working is simple: When a power supply (10-20V) V1 is connected it charges the 6V lead acid ...
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2answers
70 views

Analog Design to VLSI Layout Tool/Software

I want to implement an 555 timer. I am looking for tools preferably FREE ones. I looked at certain tools which have GUI where I can select and drop transistors which I find tedious. Is there any ...
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5answers
104 views

Open and Short Circuit questions

I am confused on the terms Open, Short, and Closed when talking about circuits.. As far as I know: a) Open circuit means the wires are cut off so there will be no current will flow. But there is ...
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1answer
71 views

Determine the current in the following op-amp circuit [closed]

It is required to find \$i_O\$ given that \$V_{SRC}=2V\$ I assumed a node voltage \$V_1\$ as shown in the figure. Therefore, since we have an op-amp then the votlage at both input terminals are ...
4
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3answers
544 views

Solving a two op-amp circuit

We are supposed to find \$R\$ such that \$I_S=0\$ and then find the maximum \$V_{SRC}\$ for operation in the linear region. I tried to use KCL at the nodes but it didn't work out eventually since I ...
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1answer
65 views

about the diode detector

Suppose we have the following diode (ideal diode) detector: In a Course notes, they did the following: When the diode is on, it conduct current \$i_{d}\$ which is also equal to ...
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3answers
60 views

How can we find transfer function of this n/w

How can we find the transfer function $$\frac{E_0(s)}{E_1(s)}$$ of this RC network simulate this circuit – Schematic created using CircuitLab
5
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3answers
361 views

How long can I practically power an IC with a capacitor?

If I have, for example, an IC that draws 10mA @ 3.3V, how large of a capacitor would I need to power it for 2 minutes? 5 minutes? I understand that using capacitors to power an IC is not the most ...
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2answers
80 views

Need help finding Vo in this circuit

I tried to simplify the circuit as much as possible to find the voltage across the current source. Then, I used voltage division to find my answer. The possible answers are 24, 10, 36 and 12. Where ...
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0answers
36 views

Second order transient circuit, complex roots of characteristic equation

Compute \$u_{R3}\$, if the circuit in the time \$t<0\$ is in steady state and in the time \$t=0\$ the switch S is turned from position \$1\$ to the position \$2\$. \$ U_0 = 10 \space V \\ R_1 = ...
2
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1answer
58 views

How to find Thevenin voltage of two-port network from admittance matrix

The two-port network is powered by 10 mV voltage source and has admittance matrix: \$ Y = \left| \begin{matrix} y_{11} & y_{12} \\ y_{21} & y_{22} \end{matrix} \right| = \left| ...
2
votes
1answer
140 views

Solving an Op-amp circuit

The image of the circuit is shown below and it required to find \$V_0\$, My first attempt at solving this problem is by changing the current source into a voltage source with 1-V and 2k\$\Omega\$ ...
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1answer
54 views

Simple Circuit with a Op Amp

We are supposed to find \$i_o\$. Looking at the 25-V voltage source and the \$5k\Omega\$ resistor, the current is \$i_x=\frac{25}{5\times10^{-3}}=5mA\$ because the voltage across both inputs of the ...