# 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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### LT Spice and inductors parallel to AC voltage sources?

This is a circuit I designed in LT Spice. There is no transformer component in LT Spice so I specified L1 and L2 as magnetically coupled with K L1 L2 1 when I try ...
363 views

### Are op amp and voltage current converter same

I am trying to create a constant current output for my project between 0 - 10 mA. I read we can convert voltage to current by using op amp http://www.allaboutcircuits.com/textbook/semiconductors/chpt-...
195 views

### Treat valve heater as resistive or constant current?

I want to run a 13V(300mA) valve filament from a 6,3VAC transformer, using a voltage doubler(Greinacher circuit). I am using PSUD2 to simulate the circuit, Which gives me 2 options for the load, ...
215 views

### RC Circuit with a non-ideal switch

We can find a lot of material regarding the charging of a capacitor. For example http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capchg.html and many more It is just an ideal RC circuit. The ...
3k views

### “Voltage source is shorted” simulation error

Take a look at the image below, Why is that bottom voltage source is shorted? (http://everycircuit.com/app/) give me the response as voltage source is shorted, why is that? As far as I know, If an ...
738 views

### Direction of resulting I through simple circuit with 2 voltage sources separated by 2 resistors in series?

I'm wondering how to find out which way the resultant current flows when you've got a really simple circuit with two voltage sources separated by 2 resistors in series. See the below circuit (the ...
233 views

### Voltage drop across a series with a source and a resistor

I've tried using KVL and KCL but nothing I do is resulting in an answer. I am struggling with how to treat the voltage drop and the two resistors that are in parallel with each other. I think I may be ...
634 views

### Why is the voltage across a dependent voltage source connected to an open circuit not zero?

I have the circuit shown below. I need to find the Thevenin voltage for it. If the dependent voltage source was a resistor instead, I think I could have disregarded it when using KVL (since the ...
1k views

### Voltage source phase shift in RC circuit

I've been doing an analysis on a particular circuit. Nothing too complicated simply a resistor and capicator in series with a 2v supply at 500Hz / 0 degrees. Essentally what im trying to understand ...
36k views

### Explain in layman's terms Vgs and Vgs(th) of MOSFET's

I'm trying to understand $V_{GS}$ of MOSFET transistor. From what I understand $V_{GS}$ normally stands for voltage gate to source breakdown, but other than that I lack an understanding. \\$V_{GS(...
9k views

### How can I convert a cordless trimmer to a corded trimmer? [closed]

I have a cordless hair trimmer that I would like to turn into a corded unit. Its AC/DC charging adapter outputs 3V at 1000mA, while the trimmer's original battery is a 2.4V 600mAh NiCd AA unit. ...
277 views

### NPN switch: What is wrong with this circuit?

I'm trying to use a single source for both output and an NPN switch (5V - 2Amp). I cannot get higher than 500mA at the output, with VLoad about 4.3 V max. simulate this circuit – Schematic ...
916 views

### Batteries in parallel vs voltage signals in parallel

From a practical point of view, when you connect two audio signals to one speaker the result is that both audio signals can be heard. That means the two voltage waves were added, correct? However, ...
2k views

### How do I switch between primary battery and backup battery, if the primary battery drops below operating voltage or get disconnected?

I have low power system which requires dual batteries to overcome the loop holes in the current system. Currently I have two batteries: Primary Battery Li-Ion 3.7V 1800mAh and a secondary battery Li-...
188 views

### why isn't Norton transform applicable on ideal sources?

An ideal voltage source has no resistance in series to it, so the it's transform the current source must have zero resistance in parallel to it. This means that all the current passes through the ...
310 views

### Source with variable output impedance / Fast large signal voltage variable resistor

I need a source that has an adjustable output impedance. Corner parameters are: Voltage range: +-5V, large signal BW > 10 MHz, output impedance range at least 1k to 500M. Larger would be better. A ...
7k views

### why does the parallel resistors with voltage source can be ignored as well as resistors in series with current source in term of equivalent circuit?

I have a problem dealing with equivalent circuit. I don't know why when the resistors that is parallel with the voltage source can be ignore as well as one in series with current source. Of course the ...
106 views

### Inductor held with hands

I have a fairly simple problem, but as I am a newbie in electrical circuits I was hoping someone might help me understand the principles of things. I have a circuit with an inductor of L = 0,102H a ...
6k views

### How to find the expression for Vout?

I have that circuit and I need the equation of Vo, I've been told that I can solve it by the Kirchhoff method but I'm not sure. Is there a way that the expression looks like Vo=K(V2-V1) ?
192 views

### What happens when I connect an LC circuit to only the positive terminal of a voltage source?

I have the following circuit: simulate this circuit – Schematic created using CircuitLab The switches flip at the same time. In the position shown, SW1 is causing a loop that only connects to ...
12k views

### Is there a difference between “voltage supply” and “power supply”? [duplicate]

A device, circuit, actuator or chemical structure which outputs a fixed voltage level is usually called with one of the following terms. Voltage Source Voltage Supply Power Supply Is there any ...
5k views

### Ohm's law of a circuit which has both a voltage source and current source

The voltage source has a specific voltage through it regardless of the circuit's current and its resistance while the current source has a specific current through it regardless of the voltage through ...
2k views

### Problem about superposition theorem [duplicate]

For the circuit given below the voltage across the resistor is definitely 5V. If we add more than two sources the voltage will remain same as before. If we try to analyze the circuit with ...
13k views

### Voltage sources in parallel [duplicate]

If we attach two voltage source of same value than what happens? I mean what's the difference between using a single voltage source and two same valued voltage sources in parallel? As they both supply ...
10k views

### Do batteries (voltage sources) supply constant voltage?

I know that voltage sources are those that can supply constant voltage. The producing current may vary with the load. Suppose I have a rechargeable battery. I fully charged it and started using it. ...
5k views

### Diode circuit with parallel voltage source

What will be voltage V if all diodes are considered ideal simulate this circuit – Schematic created using CircuitLab
2k views

### Nodal Analysis of a circuit with a dependent source

simulate this circuit – Schematic created using CircuitLab Hi, So the trouble I am having with this problem is that I don't know how to do nodal analysis with the dependent source. I would ...
214 views

### DC Voltage Source - circuit problem

I'm currently trying to build a DC voltage source from an AC source to a school project. The circuit worked fine when it had no voltage regulator, as it was just a transformer + full-wave rectifier + ...
1k views

### Paralleling power supplies for higher current

I am looking at using two Cincon (CFM80S240 and CFM60S240) power supplies in parallel to achieve a higher current output. Is this possible? If so, can I just hook them up in parallel, or is there some ...
8k views

### 3 Watt LEDs in Series - Using constant voltage source

I have 20 x 3 Watt LEDs and have a 80W constant voltage (not constant current supply). I originally wired this up with 5 sets of series string of 4 LEDs from my 12V supply, however I have been told ...
1k views

### Nodal analysis independent and dependent voltage source and current source

After spending quite a few hours I am stumped with this problem while trying to solve for Vo, which is supposed to 0.5V and this was confirmed through PSpice. I have no idea what I am doing wrong or ...
15k views

### How is a current controlled voltage source different from a resistor?

A current controlled voltage source produces a voltage that is linearly proportional to a current. A resistor has the same behavior. And the gain for a CCVS is measured in ohms, which is the same ...
1k views

### Special Source Transformations

I'm not sure if this was asked already, but I could not find it when I searched. We're learning about source transformations, and while reading my textbook I came across this: and in the following ...