Questions tagged [thevenin]

Thévenin's theorem for linear electrical networks to simplify the analysis of complex electrical circuits.

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471 views

Thevenin equation of a circuit with two voltage sources, one on an open circuit

I am incredibly sorry, as I'm sure this specific example has been asked before, but I missed the class on it and the professor hasn't yet uploaded the video to his website. I need to know how to find ...
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40 views

Finding the energy over the capacitor in DC

I tried using Thevenin to solve this and found Rth = 3 and Vth = 12 but this is way off the correct energy of the capactor (the energy is 4J).
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Modelling a temperature measurement system

The accuracy of a measurement system can be significantly reduced by loading effects in the system. A thermocouple is used together with an indicator to measure temperatures. The thermocouple has a ...
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52 views

Thevenin and resistance problem

I had a problem finding the Thevenin equivalent resistance of this circuit. If anyone could help me, I would be very thankful.
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Thévenin's theorem exercise, resistances

I've some problem identifying the \$R_{th}\$ simulate this circuit – Schematic created using CircuitLab Removing the load and short circuiting the Voltage source we get : simulate this ...
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59 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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62 views

Finding Thevenin equivalent circuit and using that circuit when terminals inside circuit

Sorry for the bad title, but I'm trying to get the Thevenin equivalent circuit and then use that circuit to calculate a current i. The problem I'm having is I'm not sure what to get the open circuit ...
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63 views

Circuit Analysis in Non-Closed Systems

So I'm fairly confident in my ability to do circuit analysis on closed circuits, that is, circuits where all loops, sources, and elements are given. However I still find myself getting stuck on ...
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467 views

how can we solve a circuit with two opposing voltage sources using thevenin theorem

i have been asked to solve a circuit using thevenin theorem but when i try to solve it to find Vth by loop analysis, i realized that both voltages are in opposing directions and i can't understand ...
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Struggling with Thevenin Equivalent Problem

I had asked this question before and thought I had found the help I needed, but unfortunately I found myself unable to solve the problem fully when I attempted it. The problem: For the Thevenin ...
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343 views

Can a Dependent source be dependent on itself?

I am looking for the Thevenin Resistance here. However, I have no clue what to do with \$i_b\$ and the source dependent on it. This is the entire circuit. \$i_b\$ is the current through the 5\$k\...
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86 views

This circuit is two parallel resistances of 10Ω. Convince me otherwise

I'm trying to find the Thévenin equivalent resistance of a circuit - one that resembles a Wheatstone bridge, but is not at balance. The load in question is where the galvanometer would appear. Anyway,...
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952 views

Thevenin Equivalent Network: How to treat Capacitor across 0v potential, with Dependent Sources?

We were given this question in our intro to EE course: Find the Thevenin equivalent network between points a and b for the circuit shown in the image below: For the short-circuit current, I redrew ...
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172 views

Confusion with short circuits, and when you can ignore a loop

For the image above, when t<0, howcome it's safe to ignore the loop with the 50V source, and the 60 and 200 ohm resistors? How do you know when you can ignore a loop, or when to ignore a part of ...
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50 views

Is my approach for the RL circuit correct?

For the image above, i(0+) = i(0-) = 0A, and to get the IL(t) function, you solve for Rth, which is 50ohms. Afterwards, i'm confused with how to approach getting IL(t).
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34 views

Question concerning equivalent capacitance

For the question above, i'm confused as to why the 6uF and 3uF capacitors have the same charge. Also, for part b, would you have to find v(t) at the 10uF capacitor? If not, what would be the other ...
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566 views

Thevenin Equivalent Resistance of complex circuit

I'm trying to find the Thevenin equivalent of a circuit of which I have already found the Thevenin voltage. Unfortunately I can't figure out how these series parallel combinations work to find the ...
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467 views

RC circuit analysis with parallel capacitances (using Thevenin equivalent)

I am trying to determine the voltage across capacitor C3 (voltmeter VM1) with respect to time. I believe that simplifying the circuit to its Thevenin equivalent is the correct way to proceed but I'm ...
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64 views

Thévenin equivalent of a Norton equivalent

A very simple question. When solving circuits, and you need to solve it using the mesh analysis, you want the circuit to only have voltage generators.I wonder if for an independent current generator ...
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304 views

Do a Thevenin source and its equivalent Norton source always supply equal power?

Power supplied by a Thevenin source $$P_{Thevenin} = V_{Th}^2 \frac{1}{R_{Th}+R_L}$$ Power supplied by its equivalent Norton source $$\begin{eqnarray} P_{Norton} & = & I_N^2 \frac{R_{Th} ...
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61 views

Find Thevenin equivalent voltage - Circuit Analysis

I am trying to understand how to calculate Vth (between the blue Volt meter and the grey volt meter). I have calculated the current correctly using KVL. However, I can't find a way to calculate Vth. ...
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252 views

Does a voltage source produce current on an open branch?

I am supposed to find the Thevenin equivalent of this circuit however the branch with the 30V source is confusing me. I know that if there was only a resistor in that branch then no current would flow ...
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76 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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367 views

Finding current when short-circuiting the terminals

I am working with the circuit shown below. I am having trouble with the situation where: if a short circuit is connected between Terminals A and B. what current would flow through the short circuit ...
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262 views

Thevenin Equivalent Voltage and Resistance with Multiple Parallel Sources [closed]

I am looking for help with finding the Thevenin equivalent voltage in the circuit pictured, basically 2c on the list of problems. I have so far done the loop equations and have come out with the ...
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8k views

Finding the open circuit voltage

I am asked to find the open circuit voltage v(AB). So far, I have found the current, I(1) by using the current divider, and I got approximately: 0.307A. Except, I am not sure where to go on from ...
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question with rl circuit

I have an assignment in my electronics 1 class: http://prntscr.com/jcdz1m My idea was to find a Thevenin equivalent, convert it to Norton then i would get Io and calculate the graph for I1 and I2 for(...
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306 views

Thevenin equivalent circuit with external loop

I am tasked with the following exercise: I am still finding Thevenin equivalent circuits challenging, and this example looks a bit daunting since it seems to have an external loop. Hopefully, I ...
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1answer
33 views

Question with using Isc -> Any errors?

For the picture below, the answer for Voc is 7.5V, but when I add an Isc at terminals AB, and use KCL, I get Voc = 3.75V. Here are my steps/equations: (1) 15 = 4I1 - 2Isc (2) 0 = 3Isc - 2I1 I get ...
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69 views

Thevenin Norton Concept

For the below circuit, assuming I add a short circuit between terminals A and B (let's call it Isc), howcome I can't use a KVL equation for the left loop, along with the right loop (IsR1 - IscR2 = 0)?
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65 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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1k views

Thevenin resistance for bridge circuit

So I've been at this question for a few hours now and i can't seem to get the final answer for a). I know how to find the the resistance of a basic Wheatstone bridge, but i don't know how to find the ...
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633 views

Can we combine these voltage sources?

In the following figure, we want to find V Thevenin. I tried combining the two 3v sources (3+3=6v due to their polarities) and applied voltage divider to find the voltage across the 150kOhm resistor ...
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883 views

Thevenin equivalent of circuit with no voltage sources

I need to find the Thevenin Equivalent left of the >> symbols. Due to the lack of voltage sources I tried finding the Norton Equivalent first and came up with \$Rn=R_O\$, \$v_{th}=i_S \cdot R_O\$. Is ...
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388 views

Finding the current of an open circuit for Thevenin Equivalence

I'm trying to find the Thevenin voltage of this circuit. To do this, I need to find the current of this circuit. The circuit is open at the right, which implies that there is NO current flowing ...
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80 views

Thevenin voltage calculation

simulate this circuit – Schematic created using CircuitLab The circuit is simplified like above to solve the thevenin voltage.The solution says that \$V_{AB} = 14 V\$. I couldn't understand ...
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67 views

Thevenin Voltage and Resistance Calculations

In order to calculate R_th, you have to made all voltage and current sources equal to 0 (creating open circuits at current sources and shorts at voltage sources), so you will wind up with only ...
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how to calculate voltage thevenin [duplicate]

I do Kirchhoff law then I found I1=232uA, I2=158uA, I3= 0,074uA now I want to calculate voltage Thevenin (voltage between A and B)? I do like this 0.000232 * 10000=3.23 but I 3.23 not correct Can ...
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922 views

how to calculate voltage between two points [closed]

how to calculate voltage between A and B?
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Calculating gain of ICF amplifier

I'm designing a circuit with an ICF (indirect current feedback) amplifier, and am trying to calculate the gain of the resultant circuit. Using the AD8237 I followed the example here when designing ...
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739 views

Thevenin's theorem BJT derivation question

I'm trying to convert the left circuit to the one on the right using Thevenin's theorem, but I'm not understanding how this is done for this circuit. From my understanding of Thevenin's theorem: (1)...
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189 views

Is this Thevenin equivalent circuit correct?

I am asked to find the equivalent Thevenin circuit between nodes A and B of the following problem, removing R1. I have attached my work because I have no idea if this is completely correct or totally ...
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112 views

Finding voltage thevenin

I calculated R thevenin to be 5.322 ohms, but I don't know how to get a voltage after this step. I tried to use node voltage equations since V thevenin is he voltage across the terminals, but it didn'...
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202 views

Thevenin's equivalent

Rth = (10+10)||5+16=20 ohms. I think the Thevenin's equivalent voltage is across the 5 ohms resistor which was found to be 11.2 volts Applying nodal analysis but the answer is supposed to be -16.4 ...
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956 views

Calculate the Thévenin Voltage (Vt) and Thévenin Resistance (Rt) equivalent of the circuit below

I want to find the Thevenin equivalent circuit but because of the positioning of the nodes a and b I can not visualize it correctly and that causes me to struggle. How wil I calculate the Thevenin ...
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867 views

I want to find voltage across 5 ohm resistance by thevenins theorem

i want to know that wether my answer is right or wrong and if it is where?
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842 views

Calculate Thevenin voltage in a Common Emitter Circuit

I am confused on how to proceed with the above problem. I have solved many problems on thevenin voltage but never faced one involving BJT. Please help me with this problem. EDIT: I have 2 approaches ...
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222 views

Thevenin Equivalent Problem

So to get started on part a I am finding the REQ of the circuit by shorting it. Now to get from A to B in this circuit that is having R4 and R5 in series with R3 in parallel so REQ = (1/900 + 1/300)^-...
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Find the Thévenin equivalent circuit with the output terminals A and B

Im not sure where to start with this question. I dont know what to do with the dependent source and im not sure what I can do with terminals A and B.
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185 views

Termination for backplane

I'm developing on a small modular computer system using the Z80 just for fun. The backplane is a prototype PCB with five DIN41612 connectors wired in parallel, running about six inches from the first ...

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