Source Definition and 1000 Threads

in the picture you can see the electrical network. in blue is the Current of each side of the electrical network. (did it with loop equations) i asked to find the Electric power of E and the Electric power of the Current source. so for E i found it and i got pe=11.4w. i also know what...

Homework Statement Find Vx using source transformation Homework Equations V=IR KVL The Attempt at a Solution After doing source transformation on the three pairs of current sources and resistors... KVL: -6+2I-Vx+4I-3+3I+5I-2=0 14I-Vx-11=0 but Vx=5I (is it? I'm not so sure about this)...

Hi. I'm investigating the idea of using a laptop battery for energy storage in a portable solar setup. The idea is charging the battery from solar panels, then power/charge other devices from the battery in low light conditions. I would like to be able to power/charge laptops and...

So I am enrolled into this course. And we are learning probability and statistics and all that good stuff. But one thing bothers me VERY much. I lie, a lot of things bother me about this course but here is the first one: Transformation of random variables. So far we have been...

This news alarms me. They say its not from Fukushima, so I guess some other nuclear facility has had a problem? http://www.iaea.org/newscenter/pressreleases/2011/prn201124.html

Referring to following video, does anyone have any suggestions on how dowsing works to locate water source? Thanks in advance for any suggestions

Problem description: The problem is Kotitehtävä 7 in the attachement. The idea is to calculate the output power (both P and Q) of the current source. Attempt: I know the current through the current source (obviously) and want to calculate the voltage over it to get the power. I have...

I'm looking at this question and I can't seem to come up with an answer, don't the VL (inductive voltage) and Vc (capacitor voltage) just cancel each other out leaving you with Vr (resistance voltage) as the source voltage, but I don't see why VL and Vc are much higher than the source voltage...

Homework Statement none Homework Equations none The Attempt at a Solution maybe they are broken down just like glucose in metabolism?

Hi, I'm trying to simulate the ship traveling in ice. Basically, I would like to assume that the rigid body dynamics is sufficient to do the job since the main point here is the interactions between rigid ice fragments and the rigid ship. The fluid interactions with ice fragments should be...

What method is usually used to locate exact place of radio signal source? Do exist some type of radio signals, exact place of origin which is completely impossible to locate?Well,at least up to few hundreds of feets?

Homework Statement Superman is carrying a red lantern with wavelength 650nm. He flies toward you at a speed of 2.7x108 m/s. What is the observed wavelength?Homework Equations f'=\frac{f}{\left(1-\frac{v_s}{v}\right)} and f=\frac{c}{\lambda}The Attempt at a Solution I used the equation...

Homework Statement Superman has a blue light of wavelength 480nm. How fast must he fly away from you so that his light appears orange, with a wavelength of 600nm?Homework Equations f'=\frac{f}{\left(1+\frac{v_s}{v}\right)} and f=\frac{c}{\lambda}The Attempt at a Solution I used the equation...

As far as I know all light speed measurements done using light sources that utilized electrons. The nominal light speed measurement used laser which is actually exited electrons. The speed of X-ray radiation from synchrotron used accelerated electrons. The speed of gamma radiation also involved...

I'm relatively knew to fluid dynamics. I'm self teaching myself. Could someone explain what it means to say a function or vector is a source term? Are there any significant mathematical properties/uniqueness's? I'm working with vector matrices, so if you could explain in this context that...

Hi all, I need to use some numerical simulation programs. The source code is provided in Fortran 90 but I'm not able to compile it. I'm using G95 complier on WinXP, and the code are avilable at the following address: http://www2.fz-juelich.de/jsc/splim/ Could you provide any step by...

I don't know if this is the right place to post this question, but here goes. Whilst solving a circuit in class from a homework assignment, we arrived at a situation where a capacitor was in parallel with just a single independent DC current source. The question is, would current flow...

Homework Statement I recently got a problem that confuses for days, the picture for this problem is in the attachment field, is there someone can tell me that, if an oscillator is topology is described using the negative impedance model in the picture, should I have R>r to ensure that the...

I'm looking for Physics 101, where they start from the very bottom of the floor in the world of Physics. I'm not taking Physics 1 until next semester, but I only know a little about what I've seen on the science channel. Does anyone know of a good website or book that can start me off on...

Currently digging in FreeCAD and I like what I see. Still very much in the development phase with lots of functionality that needs to be implemented. I've heard of DraftSight, not sure how well that works. The reason for this is that commercial CAD software is *wicked* expensive. Hundreds...

Homework Statement http://img5.imageshack.us/img5/2959/question2e.jpg Homework Equations - A current source in parallel with a resistor can be transformed into a voltage source in series with a resistor. R stays the same and Vs = R*Is The Attempt at a Solution I have tried it in two ways. Both...

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...