# 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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### How can I combine resistors to simplify circuits? [closed]

I figured that in the first circuit, I could combine R1 and R2 in series, but it doesn't appear like I can do the same with R1 and R3. Why? Need a little clarification please.
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1 vote
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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 ...
246 views

### 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 ...
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### 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 ...
1 vote
163 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 \begin{equation} \frac{d}{dt}X = AX + B\begin{bmatrix} u_1(t)\\ u_2(t) \\ \end{...
1 vote
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### (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 ...
718 views

### 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 ...
1 vote
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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