# Questions tagged [voltage-source]

Anything related to voltage sources, their circuit models and their practical circuit implementations. An ideal voltage source is a two terminal device whose output is a voltage signal with a given waveform regardless of its load, i.e. irrespective of the circuit to which is connected.

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43 views

### Problems regarding KCL & KVL

Question: Below figure represents an approximate equivalent circuit of a field effect transistor amplifier. Using KCL find the output voltage $v_2$ in terms of input voltage $v_1$. My try: I ...
374 views

### Why is the voltage drop created by a current source added?

A few days ago a similar question was asked for the simple circuit below consisting of three elements in series (voltage source, resistor and current source). Despite professional explanations, the OP ...
49 views

### Combine voltage sources [closed]

I have a Baldor DG6E generator. It must produce 120V/240V but I bought it and it has three wires as outlets - every one produces 120V. I want to combine two wires to produce 240V. How can I combine ...
35 views

### Does decoupling capacitors try to charge the fluctuating source back?

In common examples of decoupling capacitors, the scenario is like this: When the voltage fluctuates below or above its ideal value, capacitor either stores or releases energy to compensate the ...
50 views

### Calculating magnitude of current provided by a voltage source

simulate this circuit – Schematic created using CircuitLab A couple of days ago I attended an exam where I was asked to calculate Voltage at node A; Voltage at node B; Current provided by the ...
24 views

### Flow of current inside source

Does current flow in/inside an ideal AC voltage source/generator like it flows in an ideal electrochemical battery? How does the process happen?
65 views

### Current flowing inside voltage source or battery

Current is the flow of charges (many say electrons). Do these charges flow just between the terminals of the source/battery (terminal to terminal) ? Or These charges flow through/inside the source/...
33 views

### Power supplied by voltage source at non-inverting op-amp input

Take this differential amplifier: Where Vout is proportional to (V2-V1). Both op-amps are ideal with linear output. How to determine the power supplied by input voltage sources? Power should be P = V*...
47 views

### finding the current in a branch with resistor, capactor and a voltage source

I'm solving a question in Linear circuit analysis 2 class. the question is to analyze a switching circuit with inductors and capacitors. this is the circuit in the time interval drawn in S-domain ...
61 views

### Very simple AC voltage question

How to simplify these two voltage sources (same frequency) into one so I can calculate the current then the power absorbed by each element
89 views

### Why is the current for $i(t)$ $5mA$, not $5e^{-\frac{t}{0.8m}}$ mA?

Close the switch of the circuit, and it is in the steady state. We open the switch at $t=t_1$ suddenly. What is the value of $i(t_1)$? simulate this circuit – Schematic created using ...
88 views

### How to digitally control a MOSFET? [closed]

I'm trying to make a temperature controller for peltier module using MOSFET. The peltier uses 3.3 to 12 volts and 15A. So far I've only come across a way in which the circuit uses a potentiometer at ...
64 views

### Meaning of “A voltage source “likes” an open-circuit load”

I read a book "The Art of Electronics" by Paul Horowitz, Winfield Hill. In the book, I saw some phases. A voltage source “likes” an open-circuit load and “hates” a short-circuit load A current ...
662 views

### MOSFET turn on/off curves misunderstanding

The MOSFET's turn on/off curves have a part where the drain current and the voltage across Drain-Source are not zero. That's where most of the switching dissipation happens. The problem I have is in ...
56 views

### The most energy and space efficient source of 6 V DC for a trail camera

I use several low-end trail cameras for monitoring wildlife. All of them are powered with 4 x 1.5 V AA batteries. Replacing non-rechargeable cells in several trail cameras starts to generate more ...
49 views

### Circuit with dependent & independent voltage sources - Why not matching?

I've just solved this exercise by hand and then I have compared the results with PSIM Simulator and there's a difference of e-006 in the Voltage Vo. I just can't understand where's the mistake, I have ...
5k views

### Why is the voltage divider formula used in this circuit to find the terminal voltage?

I'm going through the book Practical Electronics for Inventors and there is a chapter about voltage sources that talks about practical voltage sources. It ...
61 views

### Can a voltage source have 0 power

I am facing a problem with a voltage source with 0 current through it. Will the power of that source be 0 according to the formula P=V*i? Is there a reason to use such a source if it neither provides ...
119 views

### Analysis of a circuit with 6 diodes

Here is the circuit: All of the diodes are ideal with Vf = 0. Determine Vx and Ix. My try: We have 2^6 = 64 combinations of assumptions. My problem is D1 and D2. If we assume D1 and D2 are off then ...
115 views

### Eliminating ideal voltage source for node analysis

I have a circuit that I would like to convert into a conductance matrix for the node analysis by inspection method. I have, however, run into a problem. I have this 36V ideal voltage source with no ...
71 views

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### How does a load decide the amount of current drawn in a circuit?

I realise this question might seem similar to other questions asked on the site. But what I'm asking is actually completely different. Suppose I have a 5ohm resistive load hooked up to a 10v battery. ...
102 views

### Capacitor Discharging Time under a Sinusoidal Voltage Source

I just can't find the correct solution to the following, pretty basic problem: A capacitor $C$ is continuously discharged by a resistor $R$. This is easily described by an exponential decay (\\$\...
67 views

### Source Measure Unit Design Verification

I’m in the process of designing a SMU for part of my senior project, and wanted to get a quick design review in before I did any layout for it. The SMU isn’t advanced in any regard; the only real goal ...
31 views

### Symetric Voltage source from OpAmp-Potenciometer circuit

I need to design a +/- 4.5 symetric source using only a opamp buffer, a 9V battery and a potentiometer. How can i do it?
109 views

### How to use a parametric value within PULSE voltage source in LTSpice?

I would like to use a parametric symbol for the period value of the PULSE component in LTSpice but so far I have been unsuccessful. currently my source is: ...
39 views

### Superposition analysis with VCCS

I have just started doing electrical engineering course in the university. And I really don't understand how to treat those dependent sources when doing the superposition analysis of the circuit. Here ...
78 views

### Physical connection of AC and DC voltage sources in series

in many circuits (Amplifiers, Filters etc) at the input terminal I saw a sinusoidal voltage together with a DC term, i.e. a voltage like v(t) = sin(wt) + 1 [V]. We may imagine that this signal is ...
90 views

Well I have to find the equivalent resistor of these ones and I am having a hard time trying to find it so some help will be appreciated. Figure 1. Original schematic. simulate this circuit – ...
120 views

### Why is usage of a current source preferable over a voltage source for charging capacitor?

I came upon this sentence in a paper concerned with dielectric elastomer actuators (DEA): Due to the capacitive behavior of a DE, a converter with current source functionality should, therefore, ...
80 views

### DC Power Supply maximum current

let's consider a DC power supply of 5V with for instance 1A of maximum output current (i.e. its maximum output power if 5W). Let's connect a load R = 1 Ohm. Ideally a voltage source of 5V will give ...
69 views

### Thevenin equivalent with multiple sources circuit

Sorry if I may ask an idiot question, but its gonna be for few hours right now I have spent on this question. I am asked to find out the value of the voltage between points A and B, aka Uab, and I am ...
81 views

### LtSpice antisymmetric sine pulse

I am trying to create a pulse voltage source in ltspice. The pulse should look like a half cycle of a sine wave however the rise and fall times should be different. I can create such pulse with the ...
33 views

### Is the purpose of an internal resistor in a practical voltage source to set the maximum possible current that can be drawn?

Going off the example circuit I attached below, is the purpose of an internal resistor to limit the maximum current that the voltage source can output? Since adding any passive component in series ...
179 views

### Is it possible to reduce the resistance of a voltage source (coil)? If yes, how can I do that? [closed]

First, I should inform you that I am a mechanical engineer, so this is an adventure to me. What can sound as basic to you, is like a new discovery for me. Second, I would like to introduce you the ...
624 views

### Don't individual signal sources affect each other when using a summing amplifier?

I am studying the book Electric Circuits by Nilsson & Riedel. There I learned about "summing amplifiers" and how to derive equations by applying KCL at inverting input of the op amp. I see that ...
86 views

### Simple RC Circuit question: how does a precharged capacitor interact with a lower voltage source?

So, I have this simple question to solve, but I am uncertain about some details. The circuit I have to solve is the one on the image below: I have a circuit with one capacitor(C = 1/4 Farad), two ...
171 views

### Repairing an old Bench Power Supply

I have an old PS-303D from Conrad in use at home. Recently it showed a problem. If I measure with my multi from V- to V+, the voltage reading is correct, current and voltage regulation seems to work ...
84 views

### Alternative to battery powered isolated voltage source [closed]

For some nano-physics related measurements, a very clean low-noise bias current is required. People mostly use a battery powered isolated voltage source along with a big resistance similar to this. ...
4k views

### What is the physical meaning of negative resistance?

I am a bit confused about the physical meaning of negative resistance. Mathematically, a component which has negative resistance shows a decreasing voltage across its terminal when the current inside ...
62 views

### Impedance Matching and Reflection Coefficient

Consider a real signal generator (Voltage Source Vs, output impedance Zs, reflection coefficient Γs) and a load Zl with reflection coefficient Γl. I was told that we have maximum power transfer when ...
139 views

### Superposition with dependent sources

If the value of a dependent source (say CCCS) depends on the value of an independent source (say a current source). When setting the current source to 0, would that make the CCCS an open circuit (i.e. ...
101 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 ...
327 views

### Digital voltage stabilizer relay diagram

I am using this voltage stabilizer relay diagram below, which provides a 16 step-up level. I need to edit it, so that I can made it to work as step-down in case of high voltages such as 245 and above. ...
91 views

### Select between two sources with transistors

I'm sorry if this has been asked before but I can't find useful data on this matter. I have two sources of data and I want to select one of them using transistors. If I had to guess I'd make the ...
50 views

### Voltage in a Y-Δ transform

I'm looking for a way to solve the following circuit Without the voltage sources on the circuit, I would be using a simple Y-Δ transform. But I'm not sure how I should proceed with them on. Which ...
74 views

### Understanding some mistakes, when trying to find the Thevenin equivalent

I was asked to find the Thevenin-Norton equivelant, and I got stuck on some things that I can't quite understand. I don't know if i need to be more specific. What's wrong with the following? And why ...