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Questions tagged [superposition]

The superposition theorem states that the output of a linear circuit composed of multiple independent sources is the algebraic sum of the outputs due to each independent source alone. Use this tag for questions about circuit analysis using the superposition theorem.

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answer verification for Superposition question

I am trying to solve the superposition question, but unsure of the answer. If possible, please help.
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60 views

Thevenin's Theorem: Why is there a \$R_{th}\$

Consider a linear mess present inside the box, simulate this circuit – Schematic created using CircuitLab If there's a voltage drop \$v\$ across the load, then why cant we simply replace the ...
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130 views

Why is the frequency of the response same as that of the forcing function in a linear circuit?

Why is the frequency of the response same as that of the forcing function in a linear circuit? What's the case when the circuit isn't linear?
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60 views

Superposition with dependent sources

If the value of a dependent source (say CCCC) depend on the value of an independent source (say a current source). When setting the current source to 0, would that make the CCCC an open circuit (i.e. ...
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99 views

Thevenin's theorem equivalent circuit

I had an homework to do for school. One of the questions of this homework was to find the equivalent of a circuit using Thevenin's theorem. Unfortunately, my teacher told me that I didn't get the ...
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1answer
141 views

Intuition on Thevenin's Theorem

In the following lecture by Prof. Anant Agarwal at 36:00, he intuitively proves Thevenin's Theorem using the following circuit simulate this circuit – Schematic created using CircuitLab If ...
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67 views

Why superposition theorem has not been executed here?

Here is the given circuit In this problem while finding V1 we didn’t took the voltage contribution at that point by Vo(Superposition theorem)Only current source Is has been used to find the voltage ...
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1answer
71 views

Under which specific (formal) conditions can I apply the superposition theorem?

Superposition theorem fails when you have two ideal (identical) voltage sources in parallel. Under which specific constraints can I apply it? I have read that, in DC Circuits, superposition requires ...
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64 views

Differential amplifier, superposition theorem, output derivation, what is a loop here?

So based on this article, when V1 is removed/grounded, in this picture. Is the loop number 1 drawn correctly? Or does R3 and R4 both belong to the same loop? I'm not sure how Vout2 was calculated. It'...
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What is the effect of the signals in output terminal?

I'm using superposition to solve this problem. I already know that for U1 the output is Ua1=-R/R. Unfortunately I'm not sure what is the output for U2 and U3.
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68 views

How to find the current in this circuit?

Please help me find the current flow in A1,A2 and A3. its my First FEE class and I was able to solve this with voltage source but with current source Iam Having trouble. also V1 and V3 are the ...
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63 views

Decomposing a waveform in LTspice to view only the transient component

In electric-circuit theory due to superposition for an LTI system, the voltage can be thought such that it is sum of of a transient response plus a steady state response. For example below the ...
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1answer
86 views

How to solve a circuit network involving a resistor parallel to a voltage source using only nodal analysis?

I have been stuck on this for the past week and this week i just dont seem to find out what am i doing wrong. Please help me spot my mistake. Here you can find My circuit on multisim. Please provide ...
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159 views

How to find v through superposition theorem in the following ciruit

What is the voltage V of the attached circuit? Using super position theorem. When i active the 9V source & short 12 V source is the current follows in 20 ohms, 10 ohms. & 4 ohms? Or it only ...
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154 views

Voltage Difference in Superposition Theorem

I have to find voltage across R5 using superposition theorem but the problem is that I have a voltage difference of 4.16V, Solution:- Shorting battery VS1 R34 =8/3Ω =2.67Ω (Solved R3 & R4 in ...
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36 views

Source transformation violation

Using thevenins or norton theorem, we can easily find current through the resistor as 1 amps. But if we convert the current source to voltage source , current turns out to be zero amps . Why?
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1answer
101 views

Ultra simple circuit (2 Resistor, 1 Voltage, 1 Current): Kirchhoffs Laws don't give the solution; Superposition, but how?

I am doing a course on Coursera "Intro to electronics" as electronics always was my weak point. Now we discuss npn transistors and I have simplified circuit diagram (see below) where I am supposed ...
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1answer
56 views

Skin effect with superimposed frequencies

Does a high-frequency signal affect the skin depth of another low-frequency signal? E.g.: On a solid 6mm2 copper conductor, there are three currents running through it at the same time: 15 A DC 15 A ...
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91 views

Equivalent resistance after using superposition method

Hello I am trying to find the Voltage (U in the photo) using superposition method. And the first step is to compute the voltage given by the contribution of the left source of Voltage. Is this ...
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3answers
1k views

Use of superposition principle for the inverting amplifier

My current understanding of the inverting amplifier goes as far as assuming the second golden rule: no current flows through the OpAmp. From here on, up to the end result of \$ H(\omega) = -\frac{R_2}...
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1answer
64 views

Finding a current through a short circuit (Thevenin)

I am working through a question that involves superposition. I have attached a picture of the question I am working through. I am having difficulty doing question e) and f). I was hoping you someone ...
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1answer
263 views

Two Op-Amp Instrumentation Amplifier - Gain derivation

I came across the following appnote(slyt647) which analyses the two op-amp instrumentation amplifier topology. The gain was found by finding individual gains for each op-amp and adding them in ...
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51 views

Question about voltage in the open circuit

I have this circuit here, and I'm trying to its Thevenin equivalent voltage and resistance, using superposition. When I "kill" the \$V_{0}\$ source, it becomes a wire and the voltage across the gap is ...
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140 views

Unable to verify Superposition Principle via Matlab

I am dealing with this problem where I want to verify the Superposition Principle via Matlab. I have a DC source of 100V, an AC source of 50V, 60Hz and three resistances, R1=10 ohms, R2=20 ohms and ...
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183 views

Solving all-pass using superposition

I was reading this document talking about the use of superposition with dependant sources. At example 14 they state the following : I don't understand how they pulled the equation for Vo by ...
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2answers
283 views

RF mixer theory and short circuits

Suppose I have the following RF mixer circuit- How does placing two AC voltages of differing magnitude and frequency directly in contact with one another not create a short circuit condition in a ...
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1answer
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Find the value of U by the means of superposition

I want to do that by superposition rule. Firstly i need to short the E source and compute U0 in case of current divider formula? So i will get u1 which is voltage loss when the voltage source is ...
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1answer
98 views

Thevenin Equivalent of this mesh

simulate this circuit – Schematic created using CircuitLab I have to calculate the resistancy value Rx, when the equivalent thevenin voltage is applied and generates a current of 2 Amperes on ...
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1answer
1k views

Application of superposition theorem

I find superposition to be a noob's approach towards the analysis of circuits containing multiple sources... An experienced person will probably not use it... How do we deal with various sources at a ...
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1answer
100 views

Calculate current of resistor with Norton's Theorem

I have a problem with the following circuit: simulate this circuit – Schematic created using CircuitLab I have to calculate the following data using Norton's theorem: \$R_n\$ \$A_n\$ \$I_{...
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1answer
101 views

Thevenin \$V_{th}\$ calculation problem

I'm back with my basic questions. I'm trying to answer some questions, using Thevenin, for this circuit: simulate this circuit – Schematic created using CircuitLab I must answer: \$R_{th}\$ \...
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1answer
183 views

Superposition problem with \$\Delta\$-Y conversion

I'm trying to use superposition to solve the following linear circuit: Step I step I considered each active component as: But results are always wrong. Same procedure on many other circuits give me ...
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3answers
88 views

Thevenin network without resistance?

I'm trying to find the Thevenin equivalent network for the circuit below. But whenever I solve the equations, I always end up with V(t)=2V_a - 3i_s and can't get any expression showing V(t)~i(t) ...
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1answer
373 views

Find current and VAB with Superposition Theorem

Struggling to solve the following circuit with superposition theorem... I know I need to examine the circuit with each battery in isolation but I am confused how to treat all the resistors as they ...
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2answers
1k views

Why are dependent sources not disabled with the superposition principle?

I've been wondering this recently. My intuition says that a voltage drop across a dependent source is no different than any other circuit element whose response depends on the inputs of one of the ...
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1answer
183 views

Superposition and average power dissipation

Unfortunately, I am having trouble getting started on the question above. How can one model the affect of a voltage source on a circuit without the knowledge of the resistor configuration inside the ...
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1answer
976 views

Calculating current and voltage using superposition

I'm trying to calculate Vo and Io from the following circuit: I was using node analysis but I don't really know how that worked. A friend of me told me that I could better us superposition. I ...
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1answer
320 views

Finding an unknown resistance with superposition

I've been given a problem in which I need to calculate the resistance of an unknown resister \$R_2\$ by using the superposition method. The only other info which I have is that \$R_2\$ needs to be ...
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315 views

Use superposition to find voltage V1

I first open circuited the 50 mA source and used Ohm's law to find \$V_1\$ $$V_1= 20 ∠0° \frac{j50 \times (-j25+40)}{j25 +40}$$ but the answer is not correct. Also, how do I find \$V_1\$ when the 20 ...
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89 views

Power Analysis for Non-sinusoidal excitations

For a series RLC circuit excited by a non-sinusoidal voltage expressed as any Fourier sum, we calculate the absorbed power using the formula: ΣVI \$\cos \theta\$ where \$\theta\$ represents the phase ...
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738 views

Deriving Differential Mode Gain of an Op Amp

I have been looking all over for derivations of the expression for the differential mode gain of a simple single op-amp differential amplifier. One thing that I have found very interesting is that ...
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220 views

Solve for the current in the following circuit using superposition

I understood why \$i_1\$ is equal to \$V_1/(R_1\parallel R_2)\$. But, I can't understand why \$i_2\$ became right that. Would anyone explain why \$i_2\$ is not \$-V_2/(R_2\parallel R_3)\$ (since I got ...
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1answer
212 views

Method for Measuring Power Flow in a Distribution Network?

Considering a mostly meshed distribution network (with some radial spurs) connecting zone substations (loads) to grid exit points (GXPs or sources). I am attempting to find the proportion of the ...
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2answers
321 views

Equivalent Current in Circuit

I have the following circuit: I'm trying to calculate the equivalent current. In my approach resistors 2 and 1 are in parallel so their equivalent resistance would be 2/3 then since resistors 1 and ...
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2answers
455 views

Equivalent resistances with the superposition theorem

I have the following definition and explanation of the superposition theorem. I don't understand how the resistance values are calculated. I understand that \$R=V/I\$, so \$I=V/R\$. But how is the ...
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2answers
1k views

Op-Amp Superposition

I know that by the principle of superposition that $$V_{\text{out}-1}=(1+R_1/R_g)V_{1}-(R_1/R_g)V_{2}$$ $$V_{\text{out}-2}=(1+R_1/R_g)V_{2}-(R_1/R_g)V_{1}$$ Could someone please explain the concept ...
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1answer
453 views

Voltage Mixer with 3 Resistors

The above is the requirement, I have configured a circuit as shown below simulate this circuit – Schematic created using CircuitLab I have solved the above schematic using superposition and ...
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1answer
96 views

Help with superposition

I'm trying to replace a part of a circuit with the Thevenin equivalent. I managed to find \$R_{\text{th}}\$, but I'm not sure if my solutions for \$E_{\text{th}}\$ are correct. I have 3 sources, so ...
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100 views

Can superimposed (combined) wireless signals create a health hazard?

Not to sound all tin-foil-hat-like but I'm learning about wireless signals and am trying to understand it better. So my question is: When multiple wireless signals are transmitted at the same time ...
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1answer
2k views

Finding a current by superposition theorem and a current-divider

I'd like to find \$i_s\$ for the following circuit, using the superposition theorem. First I zero the current source, which leaves me with a circuit whose resistances can be reduced, giving us $$R_t =...