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. W

    The highest temperature reachable using the solar light as an energy source

    now in many houses, there are solar water heaters the problem is that, what is the highest possible temperature reachable using the sunlight? another problem is, what if the sunlight is replaced with a laser light?
  2. 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...
  3. cepheid

    Optical Source Modulation with a Chopper

    What is the purpose of using a chopper to modulate an optical source? The Wikipedia article is not that informative.
  4. D

    Transformer, AC Source, and a Battery

    Homework Statement Using an AC signal generator vs, a transformer with turns ratio n = 1, and a battery VB, sketch a circuit that will generate the output signal vout = vs + VB Homework Equations \frac{V_2}{V_1} = \frac{N_2}{N_1} The Attempt at a Solution Here's my sketch...
  5. S

    Engineering Determine whether each circuit element is a source or a resistor

    Homework Statement In the circuit as shown in Figure 4, there are three independent sources and five ordinary resistors. (a) Determine which of the circuit elements are sources and which are resistors? (b) Determine the value of the resistance for each of the resistors...
  6. 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...
  7. P

    Source, path, reflection differences (definitions)

    What are the definitions of source difference, path difference and reflection difference. Thanks!
  8. Ivan Seeking

    Mystery Sound Competition: Who Can Name the Source?

    I don't recall ever trying a mystery sound competition. So, in the fashion of other competitions, whoever can name the source of the sound picks out the next mystery. The imagery in this video is irrelevant and not intended as a clue or a false lead...
  9. K

    MOSPF vs OSPF: Source and Destination Impact

    In the Rfc about MOSPF, is declared that one difference between this alghortim an his "unicast version" OSPF that, while in the former what is important is both the source and the destination, in OSPF what is fundamental is just the destination. Why this statement, if in both case source is...
  10. H

    Atmospheric Electic Field: Can It Ever Provide A Reliable Energy Source?

    [I realize and understand that trying to harness storm lightning is fairly impossible/impractical, so that is not the focus here, unless someone has some info contradicting that.] The basic question I have is this: there is a strong altitude correlation in the distribution of positive (higher...
  11. B

    Inductance and AC Source: Why current?

    Hello. I'm am studying topics related to inductances and Faraday's law and I'm having hard time at PICTURING situations. Mental representations. So I propose an example of something I don't understand and we may go on from there. Consider circuit consisting of an inductance and an AC source...
  12. I

    Voltage drop over dependent current source?

    I have a circuit with 3 meshes for which I have to find the mesh currents, and I have. However, I just thought that there might be a voltage drop over the dependent current source in the circuit, which would change the mesh current equations. The CCCS is shared by two meshes. When I did the...
  13. C

    Audio signals transferred by a light source

    Hi, I am currently working on a little science project, I came across this page about sending audio signals through a laser pointer. http://www.i-hacked.com/content/view/162/44/ I was wondering if it is possible if I did it with an ordinary light bulb. It said that the data is...
  14. 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...
  15. Philosophaie

    Effect of Gravity get bent like light around another gravitational source

    Does the effect of Gravity get bent like light around another gravitational source? If the object is close enough to the Earth does the Earth's gravitational force bent the Moon's or even the Sun's gravitational effect on that object before that "line of sight" event occurs. As Einstein's...
  16. D

    Find the Current Through a Resistor with a Constant Current Source

    Homework Statement Hey everyone. I might be overthinking this one, but I thought I'd post it. (sorry for the crappy MS Paint sketch!) I need to find the current through R3 Homework Equations V=IR \SigmaV=0 (around a closed loop) \SigmaI=0 (going into a junction) The Attempt...
  17. edpell

    Open Source Physics Textbooks - Learn More

    Hello, does anyone know of any open source physics textbooks?
  18. D

    Equilivant Resistance with Source

    Homework Statement See picture Homework Equations 1/R1 + 1/R2 . . . 1/Rn doesn't help you along with series equation The Attempt at a Solution Don't know where to start
  19. pairofstrings

    What is the meaning of 'Open Source' in electrical and computer field?

    Thanks!
  20. Philosophaie

    Gravity bending due to another Gravitational Source

    Does the effect of Gravity get bent like light around another gravitational source? If the object is close enough to the Earth does the Earth's gravitational force bent the Moon's or even the Sun's gravitational effect on that object before that "line of sight" event occurs. As Einstein's...
  21. B

    Magnetic field strength dependent on distance from source

    I am trying to find an equation that tells the strength of a magnetic field a given distance away from the source. It would be very helpful if all terms are defined, since the internet is notorious for not saying what variables mean. Gracias
  22. B

    Possibility of a smoothly wavelength-tunable x-ray/EUV source

    Such a device would be a major breakthrough for both research and practical usage. This is not my area of expertise; therefore I hope to get some help here. AFAIK there are four possible directions: 1. Gas discharge. It seems not to be tunable and could be applied for EUV only. 2. Beta...
  23. O

    How Can I Construct an Excitation Circuit for a 3-Wire RTD?

    Hi everyone, Im looking to measure the resistance of a 3-wire RTD using a basic data acquisition system and LabVIEW. My DAQ "box" doesn't have any internal excitation sources, and I realize one is necessary to measure resistance across the RTD element. I'm unsure as to how to construct am...
  24. V

    Hello, a simple question: a circuit with a DC source and a

    hello, a simple question: a circuit with a DC source and a capacitor (assume no voltage loses due to the cables etc..) there wille be nog energy loses during the charging of it, because there's no conduction in the whole circuit, so no work is done by de DC source now assume a AC...
  25. B

    Questions about current source and voltage

    hey guys, do ideal current sources have polarity? When I measure the voltage of a current source, it gave me a negative voltage. What does it mean? Also, can we use KVL in a loop containing a current source without converting it to equivalent voltage source?
  26. E

    Observing a light source through blinds (picture included)

    I have a mental dilemma that i would like some 'light shed upon'. For the past few nights I've been staring out my window -- which has blinds -- at a street lamp. I've been staring at this light source such that the light is traveling between 2 blinds as in the picture below (green = blinds...
  27. B

    Film source code total rubbish?

    having watched the film source code where they try and persuade that quantum physics allows for the brain to contain infinite parallel worlds i wondered if anyone made sense of it. As far as i could tell it was total rubbish from start to Finnish. Even down to the guy managing to send a text...
  28. P

    Sound of symphony from single source

    Hi, I'm sure the question is quite naive but I'm having a hard time getting around the fact that the sound of a symphony orchestra can be emitted from a speaker. That a large collection of sounds of vastly different tonality, playing simultaneously, can be reproduced by a single sound source...
  29. A

    Thoughts on Stirling engines as source of electrical power in space

    Curious your thoughts about the use of a Stirling engine to power a space station, auxiliary power for space ships inside the inner solar system, and power for space colonies in the inner solar system. I think a Stirling engine would be great to generate an electrical field, and thus provide...
  30. E

    Using Quark-Gluon Plasma as an Energy source

    Theoretically, if scientists could find a way to contain quark-gluon plasma, could they use it as an energy source like one would use a small star, or are they totally different things?
  31. L

    How to find source current in transformer

    Homework Statement Refer to the figure attached. The single phase "exact"-equivalent circuit of a practical transformer has the following equivalent circuit parameters: Np/Ns = 2400V/240V, Rp = 14.1, Xp = 31.2, Rs = 78.5*10^(-3), Xs = 120.5*10^(-3), Rc = 156*10^3, Xm = 172*10^3. The load is...
  32. B

    Transverse mode output from a multimode fiber using TEM00 laser source?

    If a TEM00 output laser source (regarding both cases of single frequency vs multifrequency) is used as input into a multimode optical fiber, is it possible for the output of the optical fiber to be multimode?
  33. Y

    Another question on radiation of time varying arbitrary source.

    For retarded scalar potential of arbigtrary source around origin: V(\vec r, t) = \frac 1 {4\pi\epsilon_0}\int \frac { \rho(\vec r\;',t-\frac {\eta}{c}) }{\eta} d\;\tau' \;\hbox { where }\;\eta =\sqrt{r^2 + r'^2 - 2 \vec r \cdot \vec r\;' } Where \;\vec r \; point to the field point where V is...
  34. Y

    How do I derive the step on the formula of distance of source to field point.

    Let \;\vec r\;'\; be position vector pointing to the source. \;\vec r\; be the position vector pointing to a field point. Therefore the distance from the source and field point is: \vec {\eta} =\vec r -\vec r\;' \;\hbox { and }\; \eta = \sqrt{r^2+r'^2 - 2rr'cos\theta}= r \sqrt{1+\left...
  35. N

    Trapping a omni-directional light source within an uni-directional light source

    Is it possible to transmit an omni-directional light source, through a focused uni-directional light source(like a laser), if each light source has a different frequency? The main problem my naive theory has(that I am capable of fathoming at least), is that trapping the omni-directional light...
  36. D

    Splitting a single light source into two out-of-phase sources?

    I've been contemplating an experiment on a 1-dimensional system which would require a single light source to be split into two separate sources which are exactly out of phase with each other. The idea is to focus the beams near each other (but not overlapping) along the 1D object. Any phonons...
  37. T

    Fundamental source of gravity?

    The gravitational force between planets and stars is often depicted as curvatures in space-time but the reason why matter causes space to warp usually isn't explained. About 2 months ago I set out to visualize and write down why matter -the accumulation of particles- bends space to the extent...
  38. B

    Heat Equation with movable point source

    1. I would like to find and plot the temperature for all points in a 1 dimensional rod of length L, due to a heat source of q placed at point xo where 0<xo<L. The ends of the rod are kept at a constant of 300 Kelvin. The thermal diffusivity constant is a. I'm also looking for the steady state...
  39. N

    Is the gravitation source of energy? And yes then can we use this

    is the gravitation source of energy? And yes then can we use this energy with any device?
  40. Y

    Common source MOSFET amplifier: voltage gain

    Hi everyone, I need to find the voltage gain for the following scheme: My book says I need to calculate 'id' first, which is: id = gm.ro.vin/(Rs+RL+ro+(gm.ro.Rs)) Then with the help of vout = -RL.id you get: Av = -gm.ro.RL/(Rs+RL+ro+(gm.ro.Rs)) So I get the last part, but I really have...
  41. H

    3D magnetic field simulation software (open source)

    Hi Everyone, Can anyone tell me an "open source 3D MAGNETIC FIELD SIMULATION SOFTWARE", which can add more than 3 magnetic fields and then give their resultant magnetic field... Any help will be appreciable. Regards, hsn
  42. 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)...
  43. Y

    Confussion about Del operator for field point vs source point.

    I electrodynamics, I've seen \nabla ' and \nabla where first is spatial derivative respect to source point and later spatial derivative respect to field point. I am confuse. According to multi-variables calculus, the \nabla operator is spatial derivative of either a scalar or a vector...
  44. N

    When light goes out of a torch while moving into another light source

    what happens specifically?
  45. Orion1

    Mathematica How Can You Extract Numerical Values from Output Box Data in Mathematica?

    \text{In}[1]:=\text{Solve}\left[\partial _{\theta } \text{Sin}[\theta ]==0,\theta \right] \text{Out}[1]:=\left\{\left\{\theta \to -\frac{\pi }{2}\right\},\left\{\theta \to \frac{\pi }{2}\right\}\right\} Is there a Mathematica source code command that can read a specific numerical value...
  46. PainterGuy

    Parallel resistance Rs in current source

    Hi :smile: I have always thought of a current source as a very, very high voltage supply with a very, very large resistor, Rs, in series (I mean this large resistor would make series connection with the load resistor, RL). The larger the series resistor the less effect the change in load...
  47. B

    What happens when you short circuit a source?

    I attached a relevant image. I was doing some circuit solving methods, and I came across this as a riddle. If I short circuit a resistor, logically, all current will go through a wire on top. But will it be the same if you short circuit a source? I mean can it be that source goes out of...
  48. E

    AC Nodal Analysis Adding source phase angles AFTER calculation?

    Just to clarify the title... Basically for the below circuit we are required to find Vth, Rth and Vo. However, the method of solving this problem is a little strange to me, because as you can see, the source has a phase angle of 30 degrees. The solution to this problem basically says (to find...
  49. G

    MWI: What is the source of Deutsche's 'fungible' instances in the multiverse?

    Hi Just finished the chapter on the Multiverse in David Deutsche's excellent book The Beginning of Infinity. His explanation of how discrete values change from the multiverse perspective is brilliant. In it he explains that there is no such thing as a 'quantum jump' and that what 'changes'...
  50. M

    Electric Circuits: Current Source & EMF

    I've been going through some materials, and I was reading about electric circuits. From what I read I figured that the electric current is dictated by the current source, and it's preserved(in the respectable branches) by the emf. Is that right? Or my feeling that I'm way off is true :)
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