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. U

    Voltage source connected with parallel.

    Hi, if i add to different voltage source in parallel what will happen. I know that KVL forbid that and in pspice it shows simulation error. But i want to know what will really happen in practice. Similarly to different current source in series?
  2. E

    Why Does Voltage Source Droop/Sag?

    Dear Forum, Hello all, this is my first post. I'm trying to teach myself EE enough to design basic circuits and play with microcontrollers (my background is computers, programing, and, um, music). I've started reading The Art of Electronics and many Internet sources but I seem to be missing...
  3. L

    Voltage source and short ckt

    I don't understand couple of things about voltage and current source. When the load impedance is lower than the source impedance of a Voltage source, why does the voltage drop? What exactly happens when you draw more current. Also, why does ideal current source have a high resistance in...
  4. A

    L, E and i: 50.0mH Inductor and 24.0V AC Voltage Source

    A 50.0mh inductor is connected to an ac voltage source of 24.0V.The current flowing in this circuit is 0.60A.The frequency of the voltage source is : a)50Hz b)60Hz c)1.27*10^3 Hz My Work so far ! : f = w/2pi. But here we have L , E and i. Any help will be welcomed.
  5. S

    Dependent Voltage Source KCL question

    I'm having trouble figuring out the KCL portion of this problem. I have no idea how in the world the solution does from; (2-v)/20 = (Vx-2Vx)/8 - (Vx-8)/4 to; 17V - 18Vx = 84 it doesn't seem to make sense; but neither does my solution. i think I'm missing some concept here but...
  6. M

    AC voltage source in an open circuit

    Please see the attached illustration. This is clearly an open circuit. The voltage source is producing a voltage at some amplitude and frequency. If one were to measure with an oscilloscope the potential difference at the point where the mouse pointer is with respect to the ground, what would...
  7. P

    Creating static charge with a voltage source

    I'm learning about static electricity. All the examples always bring up the experiments with rubbing a balloon with your hair and combinations like that. I've found a page that lists what kind of charges certain materials tend to have...
  8. S

    Only voltage source and wire?

    Only voltage source and wire?(PLEASE SEE THIS!) Suppose a voltage source of any value(eg:5V,10V etc) is connected with a wire and that's all about the circuit,nothing else (resistors,bulbs or any kind of loads) is connected with the circuit.Assume that the internal resistance of the wire is...
  9. T

    AC Voltage Source: Meaning of 50/60º RMS & Peek Voltage

    What does it mean when you put on a AC voltage source (~) 50/60º. The book I've been studying from says the rms or peek voltage only. Thanks.
  10. N

    Transforming a switch into a voltage source

    http://i47.tinypic.com/4pxbte.jpg i can't understand upon what bais they made such a transition ?
  11. G

    Charging lithium-ion cell from a current limited voltage source

    I want to charge a single lithium-ion cell from a current-limited voltage source. My "black box" (or rather, it's white -- with a question mark inside) has inputs of ~250mA @ [3.7V to 5.4V], and target output (i.e., the lithium-ion cell) of 3.2V to Vch = 4.2V. Which means: I can't charge the...
  12. F

    Impedance of voltage source, and tank ckt

    Can someone please tell me whether the following statements are wrong or right? this is not homework: 1. Voltage sources, like batteries, have a low impedance (ideally zero) 2. A good car battery's impedance (even with alternating current going through the battery) is typically far less than a...
  13. F

    Voltage source -> Ideal switch -> Resistance = Reactive power

    This is a problem i just can't get my head around. When you have a circuit consisting of a "Ideal Voltage source -> Ideal switch -> Ideal Resistance" all in series. The voltage source produces a sinusodal voltage and the switch is set to cut off a part of any rising curve...
  14. H

    Constant output voltage from a variable output voltage source

    What i got is a permanent magnet 2 1/4HP@130v DC treadmill motor and everyone know those work awesome as generators. I've also got a 1000Watt inverter which needs an input voltage of 11 to 15 volts DC. Now if the input voltage to the inverter drops below 11 volts it sounds a low voltage warning...
  15. James889

    Engineering Calculating Voltage Source with R2 Voltage Known

    Hi, I have the following circuit: http://img35.imageshack.us/img35/6735/circuitac.png My task is to calculate the voltage delivered by the voltage source Us When the voltage over R2 is known, 8cos(100t + 45) How would you do this?
  16. W

    Output of a transformer plugged into a DC voltage source by mistake?

    Homework Statement What would be the output of a transformer plugged into a DC voltage source by mistake? Homework Equations N/A The Attempt at a Solution Judging from the phrasing of the question, I am assuming that a transformer should not be plugged into a DC voltage source...
  17. K

    Designing Voltage Source Inverters for 50V Output Peak Voltage

    Hello every1 I hav a basic question bout Design of inverters(Voltage source inverters). Wel Actually what does designing mean? I hav to design a inverter whose output Peak voltage is 50v. The input DC voltage wil b around 55V.I'm using single phase full bridge inverter And i'll b using R...
  18. L

    Saltwater voltage source question

    Hello all, I am just a guy playing around. I was trying to see if I understood correctly what electrolytes were, so I set out to make a simple "battery" out of saltwater. It has been done before many times and I thought I could at least make it light an LED. Here it is ...
  19. T

    Engineering Circuit with two voltage source,

    In the picture u can see there are two voltage sources, I am confused one how to apply KVL to this. the book has this problem worked out and they get -12+4i+2v-4+6i=0 but i don't get this , i get this -12+4i+2v-4v-6i=0 and solutions isn't the same, what is my problem? For some reason there...
  20. ~christina~

    Capacitor and voltage source in one?

    Homework Statement Consider circuit below. (a)Use integral calculus to determine how much heat is generated through R when switch S is closed. (b)Derive the expressions for the charge q(t) and the current i(t) as functions of time, for the discharging capacitor in the circuit...
  21. D

    Engineering RC Circuit + Dependent Voltage Source

    Homework Statement http://img167.imageshack.us/img167/7747/picture2mg7.png Homework Equations iL(t) = current through inductor Using The Step by Step Method: Assume the solution iL(t) = K1 + K2*e^(-t/tau) where K1 = iL(infinity) and K2 = iL(0+) - iL(infinity) so, Assume the...
  22. V

    Phasor circuit problem: 1 resistor, 1 capacitor, 1 inductor, 1 Voltage source

    Homework Statement What value of \omega will cause the forced response v_0 in the circuit below to be zero? http://img248.imageshack.us/img248/1854/problem934ao5.jpg Homework Equations Phasor eqs. The Attempt at a Solution...
  23. P

    Unknown Voltage Source and Current

    I have no clue on this one either help me out a bit
  24. S

    Does the capacitance change as voltage increases in a circuit?

    Homework Statement As the voltage in the circuit shown below is increased (but not to the breakdown voltage), the capacitance a. increases. b. decreases. c. does not change. d. increases, decreases, or does not change, depending on the charge on the plates...
  25. V

    CIRCUIT ANALYSIS: Use superposition - 2 Current source, 1 Voltage source, 4 resistors

    Using superposition, find v_0 in the following circuit. My work so far: v_1\,=\,2\,i_2\,+\,v_{0\,1} v_1\,=\,4\,i_1 v_{0\,1}\,=\,3\,i_3 v_{0\,1}\,=\,6\,i_4 KCL @ v1: 1\,A\,=\,i_1\,+\,i_2 i_2\,=\,i_3\,+\,i_4 Using these six equations, with 6 variables...
  26. E

    Solving a Filter Problem with a Voltage Source Graph

    I have this filter problem, I am given a magnitude graph (magnitude vs frequency, with a point on it) of voltage across input current source and a sketch of a circuit: black box connected with a current source (cos(wt) and voltage across it is Vmcos(wt + theta)) and the question is to figure...
  27. F

    Voltage Source with output of OV

    My friend asked me a question that totally shocked me for a second.. here was the question... "Is a voltage source turned off the same as a voltage source outputting 0V or near 0V?" Then he asked me if we connected the two terminals of a voltage source to two points on an already...
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