# 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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### Why can't the following configuration be considered negative feedback?

In the following circuit I have kept the resistor ratio such that beta factor of negative terminal (part of output will come on inverting terminal by voltage division), is higher than that of positive ...
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### Thevenin Impedance of a Circuit with Multiple Dependant and Independant Sources

I am attempting to find the Thevenin impedance or the output impedance of the circuit shown in the following image. I have tried simplifying the circuit into two parallel impedances, one of which is ...
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### How to solve for $i$ using superposition?

Second semester college student. But I'm actually confused on how I'm supposed to do this. I know that I need to find $i$ values on each voltage and current. a. 12 V on, 3 mA and 9 mA off. ($i1$)...
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### Why can't I simplify this circuit in this way?

Hi, I'm trying to determine the value of Vo using superposition, however I've come across a hurdle when trying to zero the 9V voltage source. I tried simplifying the circuit using the following steps: ...
139 views

### Superposition method to get the voltage

I want to know the voltage level at node E. Using superposition, I'm having a hard time calculating when 1 V and 2.5 mA go to 0. When 5 V meets 8 kΩ and 8 kΩ and 0.4 kΩ will be in parallel. I'm ...
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### Incorrect current assumed in Hayt Ex 5.3

Here is Example 5.3 from Hayt "Engineering Circuit Analysis" p 129. I am supposed to solve it using superposition principle. While doing it I incorrectly assumed direction of $i_x$. I ...
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### Superpostion problem, why are resistors shortcircuited?

We are asked to compute the voltage between points $A$ and $B$ in the following circuit directly i.e. without using Thevenin's or Norton's Theorem: The teacher's solution is divided into three ...
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### How can I find the voltage in this circuit?

I have to find the voltage $U_b$ in this given circuit. I already tried it using the superposition principle looking at the circuit with only the voltage source first and then only with the power ...
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### Applying Superposition principle - Hayt fig 5.7

Here is my problem from Hayt I am trying to solve applying superposition principle, but I am not getting anywhere close to the correct answer. As the first step I eliminated 2A current source. I ...
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### Why does i become negative?

I'm quite new to this and I ran into this problem where I'm supposed to find the value for i in this circuit using superposition. In the short circuit case when only the current source is active I got ...
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### In superposition theorem, can I activate multiple sources together?

I was doing AC circuit analysis using the superposition theorem, which as far as I understand means I can add up the effects of multiple sources by activating only one source at a time (to simplify ...
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### Superposition: where did I get it wrong? [closed]

I'm using superposition to solve this circuit, but I get the wrong answer. Can anyone tell me why? With regards to V1 I get U_a = 35 V and U_b = 21.6 V With regards to V2 I get U_a = -5.44 V and U_b =...
1 vote
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### Using the superposition principle when there is a current source in the circuit

At the top is the main circuit. Below that is the circuit formed by removing the 5 A current source (We remove that for using the superposition principle and this is the first step). I don't ...
635 views

### Summing RMS values proof [duplicate]

I have a simple circuit with two sources of different frequencies. I was tasked to get a voltage output across a component. I know for a fact that adding the derived voltage of both sources acting ...
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### superposition principle [closed]

In the first step, I just used source transformation to get Vr. But when I use the superposition principle for this circuit, I get the other answer. Please explain it to me.
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### What are right or best analysis method on finding voltage, current and ohm in circuit analysis?

I'm new to electrical engineering. In the few past weeks, I already learn about different analyses to find what to find. Like finding voltage, current, and ohm with different methods. Examples like ...
1 vote
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### Superposition question (HW help)

I'm stuck on this question. I added my attempt to solve it. Can someone explain to me what I am doing wrong? The 2 A current gives -2.848 V and the 5 A current gives 7.121 V. With the AC voltage ...
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### Using the superposition theorem to solve for the output voltage

I'm working on diodes again and thought I'd challenge myself to hopefully learn a bit more. I've tried solving this problem before, but the superposition theorem didn't come to mind then, but I think ...
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1 vote
210 views

From the circuit below I want to find the output $V_1$. I'd say that I can use superposition theorem by dismissing $V_\mathrm{i}, V_2, V_3$ at a time. That way I could find $V_1^1, V_1^2, V_1^3$ ...
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### Superposition in state space equation with multiple harmonics in the inputs

I have a question related to the superposition in state space equation. Suppose I have a state space equation below \frac{d}{dt}X = AX + B\begin{bmatrix} u_1(t)\\ u_2(t) \\ \end{...
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1 vote
928 views

### (AC circuits) Why do I need to use the superposition theorem when dealing with two or more different sources with different frequencies?

Consider: I know that the elements would have different impedances under different frequencies, but I can’t really visualize it. Also, is there another way to analyze the circuit (other than ...
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### Apply superposition principle to compute current in the 2 Ω resistor

So in this question what I tried to do was first remove the 6A source and then try to apply the current divider rule according to which the current I = 24 x (4/12) = 8A and then remove the 24A source ...
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### What is wrong with this circuit analysis?

I have a super simple question about using superposition to solve this circuit and it looks like I am running into a misconception about why my analysis is wrong. I have attached a simple circuit with ...
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### How to do mesh analysis when 2 mesh are sharing the same voltage?

I was doing superposition theorem and trying new numericals and then I came across this problem..should I write "9 volts or 9(IsubA-IsubB)" in mesh 1?
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### Finding the contribution of a voltage source

So i am trying to find the contribution of the voltage source in the circuit shown across the 3 ohms resistor. Do I need to include the two 2 ohm resistors even though there is no path that starts at ...
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### Big confusion about the very fundamentals of circuit analysis

First, let's call IR3 the current flowing from A to B, IR4 the current flowing from B to C, IR5 the current flowing from C to (-V2). What's the proof that IR3>0, IR4>0 and IR5>0? I know this ...
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### Intuition behind the superposition theorem

Consider a circuit with only batteries and resistors. Suppose we choose a resistor at random. Then to find the amount of current through this resistor, we can do it by finding the contribution of each ...
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### Why does Andy aka's calculation work in this case?

This question is from a confusion from this thread. Assume that you have the opamp circuit shown below. Also assume that the opamp is ideal and you don't know the value of ...
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### Superposition Principle: Parallel Resistance in a current source

Good Day, I would like to ask a question regarding the superposition principle particularly when the current source is the only one active. The solution to this question is that when the current ...
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### How to calculate the voltage drop in this case?

I started with the superposition principle. For Vcc, Ib is open circuit and Eg is shorted. I got that the voltage drop due to Vcc is 10000/3 V. For Ib, Eg is shorted as well as Vcc. Since Ib is dc ...
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### How do I find Vo in this circuit using superposition?

simulate this circuit – Schematic created using CircuitLab I have to find vo in this through superposition. I found the current using a test source of 1V like so: simulate this circuit By doing ...
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### Can someone give me some insight on how to simplify this problem?

It is hard for me to understand how to start solving this problem. Should I start using the superposition theorem? Can it be simplified before?
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### Trying to find voltage v across resistor

I can find the equivalent Thevenin resistance, but am unsure where to assume ground/how to do nodal analysis (what is the rule) when the current source is passing through the voltage source. When I do ...
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### Solving a circuit using Thevenin's theorem and superposition

I have the following circuit in an example problem from a book, where it shows you how to find the Rth and the Vth. The Vth has to be found via superposition. The Rth solution is Rth = 103/77R, which ...
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### Method of superposition

I need help solving this task, if anyone had a similiar problem it would help me. The task is: Determine the power dependence for an electrical circuit current through the receiver Rp in relation to ...
1 vote
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### I get different results whenever I try to solve this circuit problem with superposition theorem. Can you please help?

My recent results are like this: i= 11,174 the current exiting from Vg= 3,304 V=53,1 I am doing something very wrong but I can't see it. My values even don't correct each other. Another thing is if I ...
1 vote
265 views

### Find the Norton equivalent of circuit using superposition

Exercise 3.23a of Kaufman, 2005: Find the Norton equivalent of the circuit in Figure 3.125: I've run into some trouble when answering this question. The Norton equivalent resistance is clearly \\$R_N=...
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### Is my current flow annotations correct?

I have this circuit given and we're asked to get the contribution of the 75V source to iR using superposition. The yellow and red line in the picture are my assumed current flow. However, I couldn't ...
1 vote
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### Superposition theorem problem

The task is to calculate i here, and the answer is 0.5A (specifically -0.5 due to its direction) but I have no idea how to get that. I've tried separate calculations of the circuit with only 1 voltage ...
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### Validity of superposition when summing powers from each harmonic

In Boylestad's Introductory Circuit Analysis 13th edition page 1176, there's an example about working out the total power dissipated by a circuit fed a nonsinusoidal signal. The signal is decomposed ...
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### How can adding a reflector to a half-wave dipole (in a Yagi Uda antenna) increase the gain by more than 3dB?

I have been designing a Yagi Uda antenna using CST Microwave Studio. For a half-wave dipole the directivity (at 1.3GHz) was 2.116dBi. After I added a Reflector, the directivity improved to 6.074dBi. ...
1 vote
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### How do you do superposition to find value of voltage source [closed]

I know when you are using superposition you have to find the contribution of each independent source. You do this by turning voltage sources to short circuit and current sources to open circuit. then ...
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1 vote