What is Source: Definition and 1000 Discussions

Open source is source code that is made freely available for possible modification and redistribution. Products include permission to use the source code, design documents, or content of the product. It most commonly refers to the open-source model, in which open-source software or other products are released under an open-source license as part of the open-source-software movement. Use of the term originated with software, but has expanded beyond the software sector to cover other open content and forms of open collaboration.

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  1. K

    Does light continue to travel through space after its source is removed?

    Does light continue to travel through space after its source is removed?
  2. A

    Source Follower with Current-Source Load

    Homework Statement I am trying to analyze the following circuit: "Note that if the two 2N5485s approximately match in their characteristics, not only is the voltage gain unity, but the DC offset is small: the constant current due to Q2 creates a constant voltage drop across R1. Furthermore...
  3. Arti

    Getting Started with Open Source Contributions: Where & How?

    hey! I want to contribute to the open source but i am unable to know the exact way, how and where should I do that. If anyone can help?
  4. A

    Independent Current Source In Series With Resistor

    Homework Statement Write the KVL Equation for the outer loop Homework EquationsThe Attempt at a Solution The question above is a sample I have made for such a condition. The goal is not to find the value, but only write the correct equation. If an independent current source is connected in...
  5. Jonathan Scott

    Stress and pressure as gravitational source

    As I'm sure I've mentioned before, I've heard people say that stress and pressure terms in the energy tensor act as a gravitational source, but I don't understand how this could be, given that these terms can simply appear or disappear (in a non-stationary situation), unlike energy and momentum...
  6. 4

    Source Transformation to find i_x

    Homework Statement I'm to use source transformation to find the current through the 24 Ohm resistor 2. The attempt at a solution I used source transformation on the left 12V source and got a .5A current upwards. The 24 and 30 ohm resistor are in parallel so I found an equivalent resistance of...
  7. 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...
  8. C

    Special Relativity as a source of Power?

    Hey guys, I've recently learned that magnetism is an electric field viewed from a different frame of reference and that the mathematics of electrodynamics describes this. However something raised my eyebrow which I wasn't quite clear on. If energy is put into a net flow of electrons, the...
  9. W

    NMOS Common source DC-bias and gain

    Homework Statement VOUT, they mean DC Homework Equations See picture, r0 is neglected also lambda (channel modulation) The Attempt at a Solution I calculate I DS with the formule given: 0.400*(0.5)²=0.1 mA IOUT = 5/25000 = 0.2 mA So the current source has got to be 0.1 + 0.2 = 0.3mA...
  10. 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...
  11. T

    How Can Students Access SCDAP/RELAP Source Code?

    :(as a student, any help would be appreciated.
  12. 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...
  13. qspeechc

    Open Source for Maths Diagrams

    Hi everyone. I'm working on getting together some notes on school maths and of course I'd like to include some diagrams. The usual stuff, graphs of things like parabolas, circle geometry, etc. But I'm also skint. So I'm looking for some open source programs that can do that, and they need to be...
  14. E

    Indeoendent current source in series with a resistor

    Guys, this seems very trivial yet I can not come to the correct answer and I've searched everywhere. I am asked to find the node voltages using nodal analysis. The trouble is I don't know how to express a current in a brach between 2 unknown voltages where there is an independent current...
  15. H

    How Does Current Source Relate to the Battery?

    How can current source be implemented? I think the source of current is the battery itself (due to potential difference). Plus current source has its own symbol. If battery is the source of current then does current source refer to the battery?
  16. 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...
  17. 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?
  18. M

    Effect of combining two source of light

    I wonder to know what would happen when we use two flashlight in a same direction. by doing so, do we extend the range of light? if so, does it mean if the lights cross each other in a point perpendicularly the range that the light can traverse is going to reduce ? I have been said that if we...
  19. O

    Circuit source current question

    Homework Statement Find is of the circuit below Homework Equations i=V/R v1+v2+..=0 is=vs/Req The Attempt at a Solution Resistance of circuit as seen by source = 7kΩ 6V(source)/7kΩ(Req)=.857i My question is, how come i3 is also 0.857i? Shouldn't it be different since it just...
  20. O

    Finding source current of a circuit

    Homework Statement I'm doing a practice problem and I'm asked to find source voltage and source current of the circuit below. Homework Equations i=v/R i1+i2+i3..=0 (KCL) v1+v2+v3..=0(KVL) The Attempt at a Solution So I started by calculating the current for the 2kΩ resistor, which I...
  21. 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?
  22. T

    Schrodinger's Cat radioactive source

    http://en.wikipedia.org/wiki/Schr%C3%B6dinger's_cat I don't understand, if the radioactive source is put in there then of course the Geiger counter will detect radioactivity so we know the cat must be dead?
  23. P

    Circuit with 1 independent current source

    Hi I've tried to solve the following circuit using Kirchoff's laws but i get wrong results.I know that because I've got a different solution of the same excercise.I've attached the image.My question is what are the equations of Kirchoff's laws because I try this over 2 hours and I can't figure...
  24. M

    Would this Battery charger work as a direct power source?

    Hello I need a source to power ADSL router when the electric power would be cut for any reason because i need to keep my laptop that i use for work connected to the internet. I found this "Anker® 2nd Gen Astro Pro2 20000mAh 4-Port Aluminum Portable External Battery Charger with 9V/12V...
  25. F

    Is friction an efficient heat source?

    Hi all, first post on PF! I was just wondering if a motor that is specifically designed to generate the most friction possible would be useful for heating purposes. If it's just wishful thinking, feel free to say so and explain why. Thanks!
  26. A

    I desire to self study Physics, need a source for practice problems?

    I am a freshman (ore med). My curriculum does not have physics until junior year of college. I want to take the MCAT at the beginning of junior year. I am reading the AP Physics textbook of my high school (I didn't actually take AP Physics, I just bought the textbook) and while I am learning a...
  27. mishima

    Constant current source advice

    Some of my advanced chemistry students would like to try this pharmacokinetic model circuit outlined in an AAPT publication (Cock & Janssen, The Physics Teacher, Volume 51, Issue 8, pp. 482-484 (2013)). It is a simple RC circuit, but I've never built a constant current source and am unsure of...
  28. Greg Bernhardt

    Insights Why You Should Not Use Wikipedia As Your Primary Source - Comments

    ZapperZ submitted a new PF Insights post Why You Should Not Use Wikipedia As Your Primary Source Continue reading the Original PF Insights Post.
  29. D

    Doppler effect (the sound source moving towards observer)

    Homework Statement the observer is stationary , but the sound source is moving towards the observer , i was told that the speed of sound relative to the observer doesn't change. why is it so ? in my opinion, the speed of sound relative to observer changed . because of v= f x (lambda) , as...
  30. P

    Gate source voltage and gate cathode voltage

    I am studying thyrisors right now. I am really struck at trigger circuit . The book shows gate source voltage and gate chathode voltage as two different things. I fail to understand the difference and significance of them. Please help me out .
  31. T

    Signal dimmed LED's without passing current back to the signal source

    Hello! I am a bassist in a rock band and I hace slight issue with trying to rig up this "this" http://www.newegg.com/Product/Product.aspx?Item=N82E16811992011 LED Controller to do its color changing awesomeness while pulsating with what is coming out of an output on my amp (which is a...
  32. D

    How Do Constant Current Sources Differ From Other Power Sources?

    How are constant current sources different than any other source? Also, would they really have a constant current in any situation? Even when back-emf is induced? Can anyone explain the use of a constant current source, and how different they are from other sources?
  33. S

    Help with permanent magnets configuration as a movement source.

    please delete this post Hello, Accidentally I have noticed a strange behaviour using two different magnets, which I would like to discuss. The picture shows a disc magnet (shown also in the right to see the magnetization) with it's N facing upwards. Onto the disc magnet N side, a cylinder...
  34. Dishsoap

    Diffusion of heat from a point source being heated continuously

    Homework Statement In essence, I'm trying to make a model of how the heat from a point source diffuses through air. It should be a function of both distance and time (I'm assuming either a 1/r^2 or an exponential dependence on distance). Homework Equations I found this equation...
  35. R

    Python Considering Re-Writing Open Source Code in Qt for Science Research

    I found some open source code in wx that I'm considering re-writing in qt and adding some new functionality to. It's for science research. Before I do, I wanted some feedback from the community if this is a worth while endeavor and an estimate of how long it would take. It's about 700 lines...
  36. F

    Density of particles outside a constant point source

    Hi, I'm having a strangely hard time imagining how the distribution of particles would look around a constant point source in some scenarios. I came up wiith something that sounds reasonable to me, but would like a logic check. The easy one for me to grasp is distribution when the source...
  37. H

    Temperature profile around heat source

    Homework Statement A point source in water provides 10 W of heat for 10 seconds, and is then shut off. The surrounding water has a temperature of 20 °C. Provide the temperature profile as a function of distance r and time t. Homework Equations The Attempt at a Solution If it...
  38. Warpspeed13

    Plasma Pinch Fusion as a Neutron Source: Questions

    Ok so I recently read this article (http://www.extremetech.com/extreme/184280-focus-fusion-has-cheap-clean-earth-saving-fusion-power-been-right-under-our-noses-all-along). This gave me a few ideas and a few questions. I would like to create a smaller version of this setup to fuse deuterium into...
  39. J

    Understanding the Source of AC in Circuit Alimentation

    When a circuit is being alimented by AC this means that exist in the circuit a voltage source that is generating the AC or exist a current source that is generating the AC?
  40. A

    Mirau White Light Interferometer. Light Source?

    Hi everyone, I'm building a white light interferometer and need help choosing and finding a white light source. I'm using this mirau objective: http://www.edmundoptics.com/microscopy/infinity-corrected-objectives/nikon-interferometry-objectives/59312 Here is the setup: I know...
  41. J

    Understanding Current Sources: Device or Electrical Object?

    Which is the real interpretation for current source? Exist some device or electrical object that acts like a current source?
  42. A

    Open Source Circuit Optimization Software Question

    Hey all, I'm working on the JUICE mission (Jupiter Icy Moons Explorer) and I've been tasked with finding software (preferably open source, but paid is fine) that can optimize circuit network designs that I upload. Originally I was trying to find programs that would run optimization using the...
  43. H

    Constant current source design

    Hey guys, I have been trying to design a constant current source that has a digitally controllable (μcontroller) range of maximum current outputs. Ideally the source would be able to be adjusted from .25mA to 2mA. The input voltage for the source would be in the range of 9 to 14 volts. Also I...
  44. R

    Source for "Shut up and calculate"

    I'm looking for the source for the QM interpretation of "shut up and calculate". I thought it was synonymous with the Bohm theory and that I had seen it in Shankar or Sakurai. Yes, I Googled it and found David Mermin, and some other dude named Tegmark that I'm won't to bring up lest I...
  45. S

    Points close to the source not behaving like inverse-square

    Homework Statement The problem - confirm that the amount of radiation measured from a source is related by inverse-square to the distance. Here is a graph of my data fitted to y = a1 * x^a2. Every point is an average of 3-8 measurements (as many as needed to have a statistical error of...
  46. gfd43tg

    Thevenin equivalent with dependent current source

    For this problem, I added in an external source, and found an expression for the external current in terms of ix. Then I divided Vex/iex to get the Rth. Then I did superposition to find the Vth. I had some troubles getting rid of the extra currents, particularly i3 and i2. I was wondering if...
  47. dwn

    Engineering RL Circuit with current source

    Homework Statement Image Homework Equations Current divider The Attempt at a Solution The only thing I see is that I solve for R1 and R2 for t < 0. Other than that I'm confused and not even sure I'm right about solving t<0.
  48. A

    Why is a magnet not an infinite source of energy?

    Hi Guys Could someone please point out where I'm going wrong with the following problem. If I place a magnet on a vertical surface such that the magnet must resit the force of gravity in order to hold itself in place, will this magnet stay in place forever? If it does why does this not...
  49. 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...
  50. 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
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