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.
249 questions
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What is the difference between a source and an active component?
I am having trouble forming a clear definition for a source component versus an active component.
From my understanding, an active component is one which can supply power to a circuit, but may also ...
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Difference between "driving with a voltage signal" and "switching a DC voltage"
I might be having a slightly dense day, but in an answer it was stated
No need to add diodes for back emf worries because you'll be driving the primary with a voltage signal and not trying to switch ...
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RC circuit with DC source: Kirchhoff’s law, voltage directions, and current flow convention
I am creating a video in Manim about basic electrical circuits. The circuit under consideration is an ideal RC circuit with a DC voltage source, no energy losses.
My reasoning is as follows:
When the ...
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How does the type of source influence the output current?
I'm struggling to understand why, depending on the type of source (AC current or AC voltage), I can see peaks corresponding either to system resonance or antiresonance. I'm looking at the current ...
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Does Thevenin apply to AC circuits in the same way?
I was in the lab and measured the analogue voltage at the output of an RC filter VF4 (top circuit). I now want to do simulations with these measurements to see how loading this voltage affects it. I ...
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Does any Independent source a Linear element?
As far as I know the linearity of any element is given by the superposition principle meaning if it satisfy the superposition principle therefore its a linear one
Meaning if $$f(x_{1})=y_{1}$$ and $$f(...
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Input voltage in voltage-following op amp
I've recently learned about voltage-following op amps in class but I didn't understand what they were for, so I decided to do a bit of research. After watching a couple videos I now understand their ...
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How best to measure the noise level & stability of a precision voltage source output?
Consider a use case for measuring a precision voltage source output's noise and stability levels.
Bandwidth is a factor in absolute noise, clearly. As such, measuring with wider bandwidth, is expected ...
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Limit reached without current at the limit on an SMU?
I have a Keysight B2900 series SMU and one of the channels is orange. By the manual, it is said that an orange display means that the current limit is reached. But the measured current (less than 1 nA)...
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measuring voltage an external power source using an MCU
As shown in the picture, the MCU is powered by a battery which is on the right. now there is an external power source/battery
whose voltage has to be measured by the MCU.But as can be seen their ...
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Help with LTspice Current and Voltage Source defined by csv Data
I am currently working on a university project and need help with a LTspice simulation.
I have two different .csv files. One describes the input voltage and one the input current, meaning that both ...
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Voltage difference across resistors with floating ends
Given a voltage source Vs connected with two resistors R and R', one in the positive and one in the negative side of the source, while their other ends are not connected anywhere, what would the ...
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Linearity of dependent voltage source (from Hayt - 8th edition)
Here is a statement from Hayt "Engineering Circuit Analysis" 8th edition, page 124.
"By a 'linear voltage-current relationship' we simply mean that multiplication of the current through ...
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Thévenin's theorem exercise with two voltage sources
I have the following exercise:
I need to use thevenin's theorem to get the equivalent voltage source and resistor
I have redrawn it in LTSpice for better understanding:
I knew how to get the ...
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Do the controlling voltages or currents act independent of the existence of a dependent source?
Dependent sources confuse me. We were taught a method using input and output resistances to find out whether a dependent source is VVVS, VVCS, CCVS, CCCS. Apparently for a voltage controlled source if ...
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Help: Thevenin's and Norton's theorem
I am having trouble understanding the Thevenin's and the Norton's Theorems in more complex circuits, for example this task:
For the circuit shown in picture 4, calculate using Norton's or Thevenin's ...
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Can a high-precision, low-current voltage source "fix" drift in a lower-precision, high-current current source?
I'm trying to generate a current source which is extremely low drift but can maintain high current (3A into a few ohms), that should be similar to this expensive high-precision current source.
However,...
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Is LTspice AC analysis trustworthy at RF when using low impedance sources?
I'm an amateur at circuit design but I've been reading a lot and trying my best. I've edited the question to try to make the main problem more coherent and add a simple schematic and plots.
My setup ...
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How to solve for V using source transformation method
Completely new to electric circuits, what is the simplest and beginner-friendly way to solve for V using source transformation?
I know that the 12 A current source could be transformed into voltage ...
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Why isn't source transformation working here?
Doing it normally you would get the answer of 2320 mW (a 4 V drop across the current source).
However, for this question I had done a source transformation to a 1 V source,
then I added the two ...
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Calculating Currents and Power in a Circuit with Multiple Resistors and a Voltage Source
I'm currently working on a project that involves a circuit with a single voltage source and multiple resistors, and I've hit a snag with my calculations. I could use some guidance from anyone who's ...
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What does a voltage or current source actually output?
Current is the rate at which electrons flow through a circuit, and voltage is the potential "drop" between two points in a circuit.
Do voltage sources output an unknown current, and vice ...
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What are the currents and the power dissipated by the load \$R_{T}\$ in the following circuit
The circuit has 2 voltage sources one of which is 0.5UR2, one current source, resistor elements R1 & R2, the load is RT 10 ohms.
Having the following circuit, I have used the Kirchhoff's circuit ...
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Ideal voltage vs ideal current source - which one wins?
Here is an example 5.8 from Hayt "Engineering Circuit Analysis" - 8th edition (p.146).
The goal is to find Thevenin equivalent faced by 1k\$\Omega\$ resistor. I am trying to solve it using ...
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Why is there a negative source voltage when the MOSFET is off in this buck converter?
This is the voltage source. As you can see, when there is a turn-off phase, I have a negative source. Why?
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Potential difference with ground
I think the potential difference (top) between the voltage sources is either 6V (15-9) or 15V (the bigger one wins?).
The potential difference between the resistor and V1 is -15V.
Is this correct?
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Practical example of controlled voltage and current sources
In text books some controlled or dependent voltage and current sources are shown. What are they really? Can someone explain them with real examples?
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Voltage distribution with two batteries [closed]
I have a question regarding a simple circuit of two batteries (9V) in series with a single resistor connected to the outer contacts to prevent a short.
When I'm simulating this circuit, a current also ...
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Why don't the panels backfeed the circuit in this 555 charge controller?
Source: Michael Davis Publishing (Mike's World) - A New & Improved Charge Controller Based on the 555 Chip
In this circuit, the positive of the batteries and solar cells are shorted together when ...
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Determining nodal voltages of a circuit with two supernodes
I am trying to determine the nodal voltages (namely, \$v_{1},\ v_{2},\ v_{3},\ \text{and}\ v_{4}\$).
I have determined that there are two supernodes: one between nodes \$v_1\$ and the reference node ...
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Resistive network with two voltage sources
Update: (I updated the description/Question for clarity)
I am currently stuck trying to solve a seemingly simple resistive network. The voltages U1 and U2, aswell as Rr are known. The unknown ...
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Adding inductance in order to make AC offset
everybody
The task was to introduce a 10 MHz AC signal to the output along with the 24 DC voltage.
If I directly connect DC to the circuit, at the output (75 Ohm resistor) I get the straight line =>...
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Why doesn't voltage on one terminal of a capacitor matter?
In the context of characterizing the load driven by an inverter by an effective capacitance, my textbook (CMOS VLSI Design: A Circuits and Systems Perspective, 4th edition, by Weste and Harris) gives ...
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Does signal source of mobile phone, from its 3.5mm headphone jack, act as a current source or as a voltage source?
Even though the audio output of the mobile phone (which we draw through 3.5 mm jack) outputs a signal that's a function of time, at a very short interval of time, this source acts as a dc source of ...
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How does an SMU change its output impedance from current source mode to voltage source mode?
The above three figures are from the Keithley 237 SMU service manual.
From my understanding, the system is configured as a famous two OPAMP precision current-pump topology (shown here).
Although I ...
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USB C Power delivery doesnt work properly
I'm designing a 5V Power source for USB-C devices.
Based on this hackaday article I've chosen 10k Pullup resistors between the CC lines and 5V to indicate that my source can supply up to 3A.
My power ...
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Why we have this voltage when using multiple voltage sources?
In the following circuit:
Why is only the voltage source of 4V operating? I know that when I remove the diodes the voltmeter doesn't get any voltage but I don't know why this happens. So my question ...
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Delta-Wye for voltage sources?
My question is if, and how I can find an equivalent network, which includes resistors and voltage sources in series with arbitrary voltages and resistances, so that to the outside the networks are ...
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Solving an RLC circuit with two voltage sources using Laplace transforms
What is the Laplace transform for an RLC circuit with two voltage sources? I tried to find I(s), but the calculation gets complicated.
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Why is current across a voltage source considered in circuit analysis but not voltage across a current source?
I am a beginner at circuit analysis and cannot find a good answer to this question. I know that for a current source voltage is dependent on the rest of the circuit, but the same can be said of a ...
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Relation between sources and branch current
Assume a network consisting of N number of resistors, dependent current sources and voltage sources also independent current sources and voltage sources (ideal). Now the current across one particular ...
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Potential should be same for zero current
In the above circuit, I have to adjust variable resistor R such that current across Load resistor RL should be zero.
Which means the voltage across RL should be same. Do i have to use KVL supernode ...
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Does resistor affect current source's current?
KCL? But,
Will the current I2 change if the resistance R1 is increased or decreased if yes then Why it is said that resistor in series with current source can be neglected. And if No then what if R1 ...
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Replacing the resistor with a source such that circuit remains unchanged
The circuit here should remain unaffected , the Voltage across 2ohm resistor is given 20 V. If we replace the A-B 5 ohm resistor with which of the following a) 25V voltage source or b) 2 A current ...
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Power delivered by this dependent voltage source
How can I approach this type of problem? Which different methods can be used here? KVL, supernode, mesh-analysis, source transform.
I tried using KCL on a node assuming its voltage V1:
...
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Special cases in ideal source transformations for equivalent cirucits
I don't exactly understand what's meant by these transformations. Are we supposed to replace one of the sources with a resistor? What's the resistor's value supposed to be?
I couldn't find sources ...
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How to model voltage sources, current sources in graph and solve for voltages, currents?
I want to model the circuit as graph with vertices and edges and then solve for the voltages at every nodes and currents in any edge using graph method.
However, I got some confusion as in materials ...
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Connect 36 UV LED board to 12 VDC source
I have a UV LED board with 36 LEDs connected in series. The board's label says it works with 12 V so I tried to connect it to an AC-12 VDC converter, but it just works for a minute and then starts to ...
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Is COM wire the same as Neutral wire in AC?
I am reading about a thermographic camera installation and I found in the schematic this diagram which has COM terminal and 24V, I have that physically and I was wondering if the COM terminal is the ...
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LTspice: simulating the bounce effect of a push button
I'm trying to reproduce in LTspice the switching response of a push button with bounce effect as shown on the second page of the SN015 Support Note by Würth Elektronik. Here is an excerpt:
What I ...
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