What is Voltage source: Definition and 127 Discussions

A voltage source is a two-terminal device which can maintain a fixed voltage. An ideal voltage source can maintain the fixed voltage independent of the load resistance or the output current. However, a real-world voltage source cannot supply unlimited current. A voltage source is the dual of a current source. Real-world sources of electrical energy, such as batteries and generators, can be modeled for analysis purposes as a combination of an ideal voltage source and additional combinations of impedance elements.

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  1. N

    Circuit consists only of voltage source and current source

    This is more of a theory question than a homework question...but could a circuit consist solely of a voltage source and a current source? What I mean is a very simple circuit with a voltage source of Vx and a current source of Ix, connected in series. No resistor anywhere. Could this work? And...
  2. STEMucator

    Solving Voltage Source Nodal Analysis: Find Vo

    Homework Statement Use nodal analysis to find ##V_o##. Homework Equations ##\sum I = 0## ##I = V/R## The Attempt at a Solution So the book started throwing voltage sources into nodal analysis and I'm a bit unsure about this problem. The answer is listed as ##V_o = 3.89 V##. All they...
  3. S

    RC Circuit with alternating voltage source

    Homework Statement I'm supposed to find the current in a circuit with a voltage source, capacitor, and resistor in series. The voltage source is described by V=V0ejwt. Here, j is the complex number j2=-1, and i is the current Homework Equations I=C*dv/dt The Attempt at a Solution I have...
  4. M

    D/C Circuit with one current and voltage source

    Homework Statement A circuit problem and I think a picture could do a much better job than anything I could type. Picture should be attached below if I didn't screw it up. Homework Equations I'm allowed to use Ohm's Law, resistor series/parallel combinations, superposition, Thevenin's...
  5. A

    Engineering Circuit theory -- Current source, voltage source, resistor in series

    Homework Statement the voltage Vc in the figure is always equal to 2 Relevant equations The Attempt at a Solution From kirchhoffs law, -Vc+4+5=0 Vc=9 V will Vc always equal to 9 V or it will vary?
  6. M

    How to split a voltage source into two

    Suppose I have a 10kW input. I want to divide the 10kW into two separate sources, like 1kW and 9kW. What can I do to separate the input into these different ratings?
  7. dwn

    Engineering Solving a Node Analysis Problem with 0.632V Voltage Source

    Homework Statement Attached image Using node analysis: ix(0-) = (v-4)/10 + v/3 + v/5 = 0 v = 0.632 ix(0-) = -v/3 = -0.211 A I don't understand why they didn't use a current divider since there is a 5 ohm resistor in parallel with the 3 ohm. Current changes for resistors that...
  8. J

    Calculating Current Supplied by Voltage Source (Complex algebra)

    I've attached the question that I am referring to. I believe I'm heading in the right direction with this one by stating that: 1/Rt = 1/(6+j8)Ω + 1/(9-j12)Ω But I am confusing myself with my algebra. Any help is appreciated
  9. A

    Is it possible? A voltage source with zero output short ckt current?

    That 2 terminals shows PD of 1 volt on Meter, but when shorted, there is no current shown on Meter? I checked and rechecked [using different meters, wires, AC, DC options and what not], so I see only V measurement, but no I. Is it possible? If so, then what is the use of that PD, when we can't...
  10. V

    Does it matter if the resistor is on top or below a voltage source

    Does it matter if the resistor is on top or below a voltage source after doing a source transformation? According to this picture from wikipiedia, the resistor is on top of the voltage source: But even if the resistor (Z) was on the other side of the voltage source, it would still be...
  11. G

    Mesh Current Analysis with Dependent Voltage Source

    Homework Statement Use the mesh-current method to find the power developed in the dependent voltage source in the circuit in figure (Figure 1) if v = 29V. Homework Equations ∑R in mesh 1 * i_1 - ∑R in common between meshes 1 and 2 * i_2 = v_source in mesh 1 ∑R in mesh 2 * i_2 - ∑R in...
  12. DarkGuardsman

    Several Voltage Source in Parallel

    About: I'm currently working on programming a basic circuit simulator for a game. One of the things i don't have a sure answer on is parallel voltage sources. I understand from what I've read so far that when two sources are in parallel the lower of the two gets overloaded. If they are the same...
  13. K

    Internal resistance seen by the voltage source, Vx?

    Hi everyone, I have attached an image of the op-amp configuration (all op-amps are ideal). Basically, the question asks to calculate the resistance seen through the voltage source. The answer is 3 kΩ but I just don't understand how this is found. If someone could assist me, I would really...
  14. Z

    What is meant by the input impedance of a voltage source?

    I am familiar with the concept of the internal resistance of a voltage source, but what is meant by the input impedance?
  15. P

    AC Voltage Sources Riding A DC Voltage Source

    Hello again, I am having a bit of trouble understanding superimposed voltage. Here is the problem: A sinusoidal AC voltage source is in series with a DC source. Effectively, the two voltages are superimposed. Draw the total voltage across RL. Determine the maximum current through RL and the...
  16. M

    AC circuit: is the voltage source absorbing or delivering?

    I'm looking at an AC circuit. There is a voltage source, a resistor, an inductor, then another voltage source. One loop. I am supposed to find the power in each element and tell weather it is absorbing or delivering. I think I remember that when a current goes into the negative terminal of a...
  17. J

    Does a capacitor delay the voltage from a voltage source in a circuit?

    If we have a circuit (see attached) will our voltage source's supplied voltage be delayed by the capacitor in anyway? (as the voltage across a capacitor lags the current through a capacitor by 90 degrees) then, as the resistor,voltage source, and capacitor are all in parallel does this cause the...
  18. A

    Thevenin equivalent phasor domain dependent voltage source

    Homework Statement determine thevenin equivalent of circuit at terminals (a,b): Homework Equations Z(L)=jwL Z(C)=-j/wC V(th)=V(oc) R(th)=V(ex)/I(ex) The Attempt at a Solution actually 1st i need help with finding V(th). i do know that V(th) would be the voltage across the 2ohm resistor, so...
  19. J

    Find the average power delivered by the voltage source

    Homework Statement Homework Equations P = 1/2 Vm*Im*cos(θv - θi) The Attempt at a Solution First I added all the impedance values to find the total impedance seen by the source. Zt = j10 + (50 || 20 + j10) = 15 +j5 Ω Now since the circuit is not purely resistive, I can't...
  20. J

    When to transform the current source to voltage source?

    Homework Statement Homework Equations The Attempt at a Solution First, I found all the impedance values. (starting from the left) Z1 = 1 / (j * 16E5 * 15E-9) = -j41.67 Z2 = 80 Z3 = 30 Z4 = j * 16E5 * 60E-6 = j96 I then combined Z1 and Z2. Z1 || Z2 = (-j41.67 * 80) /...
  21. C

    Engineering Dependent voltage source, find max. power to load in circuit & R(Th)

    Homework Statement http://imageshack.us/a/img831/2617/homeworkprobsg213.jpg Find the load RL that will result in maximum power delivered to the load of the circuit. Also determine Pmax deliveredHomework Equations V = IR, KVL, KCL, voltage division, current division Thevenin procedures,Pmax...
  22. C

    Nodal Analysis of a Voltage Dependant voltage source, no pretty answer

    Homework Statement five branches left most branch: 50 Volt source second left most: 10 ohm resistor shared branch between the second left most branch and center: 10 ohms (Voltage drop from left to right= V delta) center branch: 30 ohm resistor between center and second right...
  23. E

    Bonding High Voltage Source with Low Voltage Source(s)

    I'm trying to get a better understanding on how grounding, bonding, and earthing works when high voltage sources interact with lower ones. For example, if you have a 400V AC, 20V AC, and 5V DC source all stored in the same aluminum cabinet (surrounded by a faraday's cage and connected to earth)...
  24. Q

    Charging two plates to the *same* charge, using a voltage source?

    Here's the scenario: I need two plates that start off in proximity (a few mm apart), and I would like to vary the charge in these plates to achieve a repulsion force. Ideally it would be varied by a voltage source, so that I have fine control over the repulsion. But as it happens, it is not...
  25. M

    Find Current Through Voltage Source Using Kirchoff's Law

    Homework Statement I need to find the current through the 3V voltage source: picture of the circuit and the equations there: vantraveller.blogspot.ca The Attempt at a Solution I was about to get 3 equations, however, I find myself having 5 unknowns, what other equations can I write...
  26. A

    Engineering Current through inductor in a circuit with a sinusoidal voltage source

    Homework Statement http://www.wifstrand.se/Albert/stuff/p7.7-1.png Homework Equations vL = L * (diL / dt). All of the inductors can be reduced to a single 8 H inductor, so iL = (6 / 8) * ∫ cos 100t dt = 0.0075 sin 100t if you integrate from 0 to t. The Attempt at a Solution The formula...
  27. NukeEngineer

    Ideal current source parallel connected with ideal Voltage Source and vice versa

    Homework Statement Homework Equations Anyone Know why If an ideal voltage source and an ideal current source are connected in parallel, then the combination has exactly the same properties as a voltage source alone? and If an ideal voltage source and an ideal current source are...
  28. I

    Engineering Thevenin/Norton circuit with dependent voltage source

    Homework Statement This problem has two parts, so I might as well inquire about both. https://www.edx.org/static/content-mit-6002x/images/circuits/H4P3%20Thevenin.2b9528ba9f62.png The figure above shows a circuit with a linear current-controlled-voltage-source and its Thevenin...
  29. Y

    Engineering AC circuit with dependant current and voltage source and open circuit element

    I've been given the following problem (attached), not sure how to tackle this one, do I use mesh/node analysis and super node analysis, or can I find the v in the loop with the dependant voltage source then use that as the supply to the second and third loops? Not sure, any help would be...
  30. E

    Engineering Analyzing a circuit with a current dependent voltage source

    Hey guys, I'm trying the analyze a circuit, I have the answers I should be getting but they're way off what I'm getting when I'm trying to work it out. I think I might be approaching it from the wrong angle, does anyone have any suggestions as to where I might start. I'm trying to find v3...
  31. A

    How do i find the equivalent voltage source?

    Homework Statement How do i find the equivalent voltage source of... 1) Two AC voltage sources in series with same frequency and phase = ? 2) One AC voltage source in series with a DC voltage source = ? Homework Equations Equation of a AC voltage source as a function of time V(t)=V_m *...
  32. C

    Sloving a depentant voltage source problem using node voltage

    Hi everyone, I currently stumped in the process of approaching a dependent voltage source problem using node voltages. Attached is the circuit. What I know: the Node north of the 60V supply with also be 60V there are four nodes, two when supernodes are used What I'm confused...
  33. A

    Possible to charge a battery pack with a lower voltage source?

    I'm working on a project that has a 7.4v rechargeable battery pack and I am going to recharge the pack with a solar cell. If the solar cell is only capable of outputing no more than about 2v, is it at all possible to charge the battery pack? Thanks!
  34. F

    A battery is a voltage source: it provides constant voltage

    Hello forum, a battery is a voltage source: it provides constant voltage, regardless of the load connected to it. there is also a current source: it provides constant current, regardless of the connected load. Is there something like a power source, something that outputs constant...
  35. W

    Resistance controlled voltage source (for led array

    hi all, I'm looking for a cheap (and by extension simple) circuit. i have a special pot (Piher's 10mm hex PT-10) that can't be changed. the pots can be physically changed but i have to use this type. the series has a 150mw power rating, with resistances of ...
  36. M

    Confusion on Independent Current Source and Independent Voltage Source

    Homework Statement Given the this circuit calculate the voltage through the 3amp source? attached is a jpeg of the circuit. I wasn't able to get a good score on this one question quiz since this boggled me. Is true if I put current source that it will dictate the current of the battery...
  37. M

    Engineering Circuit with dependent voltage source

    I am trying to solve for va in the circuit below, which has a current controlled voltage source: Given: v1 = 5u(t), K1 = -3, the circuit is not energized at t = 0 I began by writing loop equations for each of the three parts of the circuit. Then I realized I am not quite sure how to get va...
  38. J

    Doesn't ideal voltage source have different voltages?

    "An ideal voltage source is a device that produces V volts across its terminals regardless of what is connected to it" - this is the definition that I have in my book. Then they have a question in which the voltage across an ideal voltage source varies with time. How is it varying with time...
  39. F

    Node voltage Analysis with voltage controlled voltage source

    Homework Statement Here is the circuit http://i.imgur.com/Xn2mc.jpg The Attempt at a Solution I've tried it a few ways, but the one I'm going for at the moment is this Node 1: (v1-v2)/10 + (v1-v3)/15 + v1 /5 = 1 Node 2: (v2-v1)/10 + (v2-v3)/10 + v2 / 5 = 2 Node 3: 2Vx where Vx = (v2...
  40. H

    Engineering The components of a circuit with a voltage source and 2 resistors

    Homework Statement The components of a circuit with a voltage source and 2 resistors ( series ) has the following values vs = 10V, R1 = 100 , R2 = 150. With i1 leaving the +ve vs and i2 leaving -ve vs ( i.e. i1 entering node A, i2 is entering in the opposite direction of i1 ) Find: a)...
  41. S

    Node voltage w/ voltage source

    This question has been driving me crazy because i am unsure when i am able to apply voltage division to portions of a circuit i try to analyze. I know the potiential difference across a voltage source always needs to be equal to the value of the voltage source but, if the branch coming out of...
  42. PainterGuy

    Current source, voltage source

    Hello everyone,:wink: I am having difficulty understand the concept of current source and what it really is. I have written down below what I think of current source. Some things I said will be wrong and there could be possibility that some are not wrong!:-p Now you help me out please. Much...
  43. S

    Thevenin with dependent voltage source

    Homework Statement Find Rthev as seen by terminal (a,b) http://cid-3c099006138591f8.office.live.com/self.aspx/Pictures/IMG^_0337.JPG Homework Equations Can somebody point me to the right method to solve this problem. I know how to solve when there is a dependent source, but the dependent...
  44. M

    Modified nodal analysis with Voltage Controlled Voltage Source

    hi, i got a question about mna. i know how to write matrixes with(out) voltage source but i don't know what i should do when my instructor askes me placing vcvs or vccs instead of any resistor. i have lecture notes for vcvs ust like; Vpq=u(mu)*Vkl i should add extra rows and cols. to matrix of...
  45. D

    Questions involving more than one voltage source

    Consider the following circuit. Using superposition determine a) the magnitude and b) the direction of the current going through R_1 (is it away from node a?). Dtermine the c) magnitude and d) direction of the current through R_2 (is it away from node b?). e) Find V_{ab}. a) First, I will...
  46. S

    Discharging a high voltage capacitor using a low voltage source?

    Suppose a capacitor is initially charged up to 2V, and then a 1V DC voltage source is used to discharge the capacitor to 1V, what is the energy consumption from the voltage source and what is the total energy loss? Assume the capacitor is connected to the voltage source using a resistor and...
  47. Simfish

    Impedance across AC voltage source

    Homework Statement An impedance 1000(1 + i) Ω (and note it contains an imaginary part) is connected across an AC voltage source of amplitude 10 V and frequency 60 Hz. Whatʼs the power dissipated during one cycle within the impedance? Homework Equations P = Re(V*I), where V* is complex...
  48. B

    Engineering Circuit with Dependent Voltage source

    Homework Statement Find ix i tried answering it i wasn't able to get it. The answer is given for basis by the way. (ix = 1.176 A) The image is attached to this post. Sorry for the inconvenience, it's my first time to post here. Homework Equations KCL(?) KVL(?) The Attempt at a...
  49. F

    Connecting a conductor with a voltage source

    This kind of confuses me. You have a capacitor which has a voltage of 200 volts. Now when doubling the distance between the plates and adding a 100 V voltage source to it, it is said that the voltage between the capacitor plates stays the same, as in 200 V. I don't follow. Someone care to...
  50. L

    Connecting Current-controlled Voltage source in PSpice

    Homework Statement Referring to the circuit, I need to verify this by PSpice simulation. I have calculated gain parameter k = 2.5 when Rin = 0 and the current flow through the 0.5S(2 ohm) resistor = 0.5IoA, which is correct. The Attempt at a Solution Firstly, I considered Io as a 1A DC...
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