Sources Definition and 538 Threads

I am doing a small project on Gamma Ray Bursts. I am looking at a data set of around a dozen bursts which are observed at an angular offset from their host galaxies (My theory is that they are in dwarf galaxies orbiting the host galaxy). Say the average separation of these GRBs is 4...

Hello Guys ! My Question : in this photo i found That Total Resistance will be = 7 ohm . and I2 = 12 / 7= 1.71 A and I1 = 0.5 * I2= 0.5 * 1.71= 0.85 A I can't understand why I1= 0.5 I2 ?? and why it isn't the same of I2 ?? here is the photo Thank you Guys ! :))

Hello again, I am having a bit of trouble understanding superimposed voltage. Here is the problem: A sinusoidal AC voltage source is in series with a DC source. Effectively, the two voltages are superimposed. Draw the total voltage across RL. Determine the maximum current through RL and the...

Homework Statement A fly is moving with a speed vl=3m/s and a bat is chasing it with vs=5m/s. The bat is emitting a sound with fs=50kHz. They are moving on the same line towards point C which is a source emitting a sound at f'=57Hz. Find the frequency of the total sound the fly is hearing. The...

Homework Statement I have a circuit and I need to find the Nodal Equations that would mathematically describe the circuit, then proceed to finding the voltages at each node using Cramers rule and the currents at nodes 2 and 4. I don't think I would have much of a problem utilising Cramers...

Homework Statement I've been struggling with simplifying this circuit, eliminating a bunch of sources and moving around stuff in general. I'm still very unsure of how to handle nodes with multiple sources though. Like in the picture I've attached. I've got a voltage source and a current...

Don't know which sub-forum this topic belongs to so I'm sticking it in here. I'm currently at a temp job testing hot melt machines that powers from a 240v 3 phase source. Electrical safety was never really emphasized in engineering school. Is there a standard list of safety protocols or 'do...

I am actually quite confused on how a generator is supposed to be modeled... To add more power to a bus, we put more generators in parallel at the same voltage (which is the bus voltage). Therefore, I would say generators are current sources as more generator are put in parallel, more current...

Im somewhat new to modern physics, had one introductory class in my university and because it fascinated me so much, I've watched all the leonard susskind lectures on quantum mechanics, entanglement, and particle physics on youtube on the Stanford channel. Today I noticed something strange...

Homework Statement A uniform ladder of mass m and length L rests against the wall as shown. The coefficients of static friction between the floor and the ladder and between the wall and the ladder are equal to each other (μ). What is the maximum value of angle θ that the ladder can make with...

Homework Statement This isn't a homework question, just one I can't get the correct answer to. The circuit diagram is attached, and I need to find the voltage at V. The Attempt at a Solution Assume the voltage drop across each diode is 0.6V. Let V_5 be the voltage drop across the current...

Hi, I have just seen this statement in another forum: An inductor is a constant current source for a limited time until its energy is expended. A capacitor is the counterpart being constant voltage until its energy is spent. I am not quite understand it. Can you help me? This is not a...

Hello all, I am an amateur "physicist" just tinkering and experimenting with my son, and as I read the posts about different concepts, I can get the general idea of what is being explained. However, when it comes to the math (equations for the wave functions, calculating eigenstates, etc.) I...

http://imgur.com/09Rj0ND 2. V=IR 3. My real question is if I can combine the current sources. I'm pretty sure you cannot. I have combined the resistors in parallel, but I am not sure what to do next

When I look at a distant light source (like car headlights, or street lamp lights) I notice colors of the visible spectrum (as separated (as in after prism refraction)) immediately around it and it's not just around white light sources. It becomes more obvious if you place something with a...

Homework Statement In a plane onset flow of 4 m/s, a source of strength 13 m2/s per metre is located at the origin (x=0, y=0) and another source of strength 18 m2/s per metre is located at (x=3m, y=0). Calculate the gauge pressure at the point (0, 2m), Take ρ =1.2kg/m3 Homework...

I was just wondering what would be sources of error in calculating thermal expansion

Hi, it's probably a stupid question, but I was wondering if it's possible to build interferometers with two perfectly calibrated lasers at the same wavelength. Would the same sort of results appear as with a single source of light, or does the fringe shifting effect only appear when the photons...

Homework Statement The problem is uploaded it is problem number 2 Homework Equations The Attempt at a Solution I really just want confirmation that my work is ok, and the command for a dependent current source in PSpice. The things that I found that are dependent, are very...

Homework Statement We are given a simple circuit with 4 resistors, a known voltage source, and an unknown voltage source. The photo is below in my solution attempt.Homework Equations V=IR, R(parallel)=(1/R1+1/R2)^-1The Attempt at a Solution I found the voltage drop over the given resistor, then...

Homework Statement Use the superposition principle to determine the value of Ix. Homework Equations I1+I2+I3=0 KCL V1+V2+V3=0 KVL Ix'+Ix''= answer The Attempt at a Solution So I understand how to get Ix' its just standard KVL it is -10+2Ix'+Ix'+2Ix'=0 which solving for Ix' gives 2A...

Hello! In an electro-magnetic context, the power that an electric source of field delivers to the field itself may be written as p_S = - \mathbf{E} \cdot \mathbf{J} where \mathbf{E} is the electric field produced by the source and \mathbf{J} is the corrent flowing on the source, forced by...

Homework Statement http://imageshack.us/a/img834/5512/homeworkprobsg216.jpg Using superposition, find i.Homework Equations V = IR, KVL, KCL, Nodal / Mesh analysis, voltage division, current divisionSuperposition procedureThe Attempt at a Solution So this time the dependent source is a...

Homework Statement Well this is the problem: Whats the current in I1 and I2? Homework Equations I'm guessing you use Kirthoff's Laws.The Attempt at a Solution Well, what I did was I broke it up to two different circuits but then it would have two different currents flowing into the 2 ohms...

Why is there a difficulty in the world to discover new energy sources? That is long lasting, eco-friendly, and highly efficient. We've progressed in many many fields but I find this field being the least... I've been thinking a lot about this, since in the future I'm specializing in this...

Homework Statement https://www.diigo.com/item/image/2sb3i/1svo Why don't we flip the signs of VA like this : https://www.diigo.com/item/image/2sb3i/g2a4 because the current must flow from + to - of the resistor. Homework Equations none The Attempt at a Solution none

I'm looking for a place online that lists and/or describes recent medical studies on various issues. For example, I've heard conflicting information on whether Omega 3 supplements (fish oil) can help prevent memory loss. Some studies have indicated yes, others no. What I'm looking for is a place...

Homework Statement Find the voltage across the 10 ohm resistor. http://www.spacemonkeybrewing.com/images/circuit.jpg Homework Equations KVL - Sum of Voltages in a closed loop equal zero. Ohms - V=IR Voltage Divide - Va1 = (R1/(R1+R2...))Vs The Attempt at a Solution This is only...

Hello! I am trying to construct (if it is possible) a potential formulation of an electromagnetic theory which permits the presence of magnetic sources, using as a starting point the equations referred here: http://en.wikipedia.org/wiki/Magnetic_monopole Although I think that I have make some...

Good morning, in circuit theory I know that reacting power arise from phasors and represents a power which can't be used, because not delivered to any load, but continuously flows back and forth between the load and the generator with a zero mean during one period. I can't understand very well...

i want to amplify my current from 300mA to 600mA. i m making a solar charger and the specifications say 6v 400mA. however i m unable to receive 400mA.. is there a way to amplify current to 600mA from 300mA.. i can lower my volt to 5V from 6V. i don't want to use any external dc or ac supply

In the ZWM study of 1991 Mandel et al get coherence between the signal photons of two distinct downconversion sources. This is shown with an interference collection between the two possible sources of signal photons (even though they are entangled with the idler). This is achievable because...

hi all, please advise any books or websites or any other resources that I could find some sample questions (like the sample exam questions) for those subjects (more questions the better! ideally with answers!) Really appreciate for your help! !

The optical two-source interference effect due to Hull (1949) has largely been overlooked by the history of quantum mechanics. Mandel and Fleegor brushed up the effect by reducing the signal strength of the sources and reducing exposure times for interference collection. In the end this effect...

Hi everyone. I have a few ideas floating in my head for a story I would like to write. I have got nothing concrete yet so my story is still very flexible. First of all the story will take place in the nearish future, say in 80-120 years. First of all, I want some ideas of possible power...

I'm asking because I was solving a double slit experiment problem in which the light was bichromatic (composed by 2 different colors, λ1 and λ2). What would we seen at the screen? Are there places where only one wavelenght is observed? Can the 2 wavelenghts interfere to create a third...

Hi PF, I would like to implement different random number generators using AVR microcontroller (both PRNG and TRNG). So I would like to get suggestions about different sources of entropy for TRNG and algorithms for PRNG. Also wanted to test the randomness. And What is chaos theory...

Since there was some confusion previously where this post was mistaken for "homework" let me underline now *** THIS IS NOT HOMEWORK *** I've finished university 20 years ago, so this has nothing to do with any schoolwork or anything like that. I'm simply trying to understand some papers I'm...

Homework Statement Homework Equations V=I*R The Attempt at a Solution I started writing the equations for each loop. Loop 1 -> I1=8A Loop 2 -> -6Ix + 4I2 + 2(I2-I3) =0 and Ix=I4-I2 Loop 3 -> I don't know how to approach the dependent current source here. Loop 4...

When calculating power in a given circuit, why is the complex conjugate of the current used to compute power?

Earth shouldn't alone make the value of g=9.81m/sec^2. There is the moon, all the planets and our sun (ignoring the outstanding multitude of outer space for my simplicity) and all of these bodies must have some influence on everything that's on Earth. So if we want to find the real acceleration...

Can you suggest any source available on internet which may be particularly helpful for those studying/brushing up knowledge of classical or quantum field theory without help of any teacher or friend? Some calculations are at first not so straightforward and there are many types of calculations...

Homework Statement . In the following transient circuit, assume at t<0, the circuit is at steady state. Find v0(t) for t>0 http://sphotos-b.xx.fbcdn.net/hphotos-ash3/c0.0.354.354/p403x403/546839_509413575744829_42997155_n.jpg Homework Equations The Attempt at a Solution The...

Homework Statement The circuit shown in the figure below is connected for 3.10 min. (Assume R1 = 7.90 Ω, R2 = 2.60 Ω, and V = 16.0 V.) The circuit shown in the figure below is connected for 3.10 min. (Assume R1 = 7.90 Ω, R2 = 2.60 Ω, and V = 16.0 V.) Homework Equations Kirchoff's...

I'm trying to figure out how multiple AC sources which are in phase would be able to be used sequentially to power a load. This all started as I read some literature about solar PV panel systems which had a wiring diagram to tie output from the inverters directly into the electrical panel split...

Homework Statement I am somewhat confused about when you can add parallel current sources: Are the sources in the diagram I drew - A - in parallel? To me they look like they are but I am not sure... Is there an easy way to visualize these problems?

I used to watch youtube videos for general physics and statics but I can't seem to find good help sources for dynamics. Does anybody know of a good youtube channel that has helpful videos for the dynamics course or any other websites that help make more sense of the class? If not, can...

Homework Statement In my electromagnetism lab, we had one electrode connected from the negative end of a power supply to one end of a conductive sheet, and the other electrode connected from the positive end of the supply to the other end of the conductive sheet. The potential difference of...

Homework Statement The problem is attached below.Homework Equations The Attempt at a Solution I tried reducing the circuit by applying a source transformation to each pair of current sources and resistors. I reduced the CS and R at the upper left to an 8V source and 4-ohm resistor in series...

Ive been given an assignment with the question being question 13of the following pdf: http://vlsi-eda.cm.nctu.edu.tw/course/ICT_12Summer/hw/HWCh4.pdf (note this isn't my actual assignment i just found this one on the internet that happened to be the same question that i was looking for) Im...