Source Definition and 1000 Threads

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...

Homework Statement Solve the following differential equation for q(t) (position): q''-qω^2 = C, where C is a time-independant value (basically a constant)The Attempt at a Solution This equation is not homogeneous, therefore it must be non-homogeneous. However, in every definition of...

Hello, So this thread is about using transistor as a current source. I understood the concept and all. But the main point of this thread is to finally seal my knowledge of transistor in saturation mode. We did an lab exercise about current sources, by biasing transistor with voltage divider...

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?

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...

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

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...

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...

"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...

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

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...

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...

[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...

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...

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...

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...

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...

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...

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...

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

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

Thanks!

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...

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

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...

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...

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...

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?

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...

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...

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...

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...

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?

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...

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?

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...

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...

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...

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...

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...

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...

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

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...

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

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)...

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...

what happens specifically?

\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...

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...

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...