Circuits Definition and 1000 Threads

Homework Statement [PLAIN]http://img143.imageshack.us/img143/3746/electriccircuits.png Homework Equations The Attempt at a Solution Can someone help me with part B of this? I understand that in part a it says the 5 A source is delivering 10 W of power, so that would in turn...

Quick question: how do you solve an ideal op amp circuit with the two terminals connected to independant power sources?

Homework Statement Find Req. Homework Equations Series: R1 + R2 + ... Parallel: 1/(1/R1 + 1/R2 + ...) The Attempt at a Solution There's no solution for this one in the book but I'm thinking that I can break this up into two parallel sets. Parallel1...

Using Thevenins therom to solve a "simple" circuits Homework Statement The problems I am stuck on is problem two, figure 1 and figure 2. It's attached to this post. Homework Equations The Attempt at a Solution My initial attempt at solving for Rthev for figure 1 was that...

I feel as if the difference between grounding in a circuit and grounding in mains power is not very clear. So my questions are, what does a ground do in circuits and is it necessary?

Homework Statement What is the value of resistance R in the figure, if the current through the battery is 5.0A? Homework Equations V=IR Rt = (1/R1 + 1/R2)^-1 + R3 The Attempt at a Solution Rt = V/I Rt = 2V/5A Rt = 0.4ohms 0.4 = (1/0.5 + 1/R)^-1 + 0.1 R = -5 ohms (the...

Homework Statement [PLAIN]http://img535.imageshack.us/img535/7201/electriccircuits113.png Homework Equations p = dW/dt; p = vi; W = Integral (p(t)) dt The Attempt at a Solution I think for the most part I got parts a and b correct. What I'm having significant trouble with is...

If 2 circuits are connected by a single wire, will there be current in the wire?If there is current, it can only goes throgh one way (ex: right or left) . In a 2 circuits like the example, [PLAIN]http://img594.imageshack.us/img594/838/imagemgpp.png Where c and d are generators...

I'm just looking over some introductory notes to transistors and it says that BJT transistors are useful for amplifying current, so does this mean that power consumption (P = VI) in a circuit would be reduced because of a smaller input current? Or is the power consumption calculated by the...

What will happen to the following circuits immediately after T is closed? Obs: A) 2 generators of voltage 3V and V, 2 resistors of resistance R and 2R B) 2 generators of voltage 3V and V (second inverted), 2 resistors of resistance R and 2R C) 1 generator of voltage 3V, 1 capacitor...

Question: Determine the net resistance of 100 ohms, 250 ohms and 400 ohms connected in a parallel. I have no clue how to figure this out. I have read and reread the section in my book and it is not helping. Please help.

Homework Statement I want to know how to arrive at the equation for the base emitter side and collector emitter side of a transistor using kirchhoff voltage law. Homework Equations Kirchoff voltage law is \sumV = \sum IR. Please refer my attachment in which i have to arrive an equation...

Homework Statement A complex AC voltage is given by the equation v = 3e^j450t : Note the use of bold v to represent the complex voltage. For this voltage waveform, what are the values of -volltage amplitide -frequency -instantaneous voltage -graph it in a argand diagram at t=pi/1800 Homework...

Hello, I am currently studying RL circuits and I know that when an inductor is attached to a resistor of large value, the time for the energy stored in the inductor to dissipate in the resistor is shorter and vice versa. This is proven mathematically by the time constant term Tau : L/R But...

Hi guys, is there anyway i can solve the voltage across the current source using Mesh Analysis. I already solved for the voltage across the current source using Nodal analysis. And btw, do you have any tips which technique is the best to use (Kirchoff's, Mesh, Nodal analysis) for different...

Hi pf, first time poster, long time lurker. The question that I have is: how much of analog electronic circuits must you know about before digital electronic circuits (I'm talking about the introductory level for both of these subjects). At my school, they offer a 2-part course in analog...

Homework Statement A circuit with a resistor, capacitor, and inductor all connected in parallel with resistance = 5000 ohm, inductance = 1.25H and capacitance = 8nF, find the voltage across the components. Homework Equations v = L*di/dt, i = C*dv/dt, v = iRThe Attempt at a Solution I'm not...

[b]1. Homework Statement [/ 1) Find the average and relative power for the voltage source and for each impedance branch. Are they absorbing or delivering average power/magnetizing VARS? Homework Equations Those derived and average power=P=((Vm*Im)/2)*(cos(theta(v)-theta(i)) reactive...

Hello, my name is Dennis; and I am rookie engineer. I have a doubt in the above circuit and I was wondering if any of you could help me. I have attached a schematic for a power/ battery charger circuit. Right now My concern is on the battery charger circuit marked with a red box. According to...

Homework Statement Refer Attachment Homework Equations The Attempt at a Solution I have drawn the current direction in green. Are there any rules regarding the direction of the current? I am at a bit of a loss regarding the horizontal current through the middle. The best I could...

So I came across http://amasci.com/miscon/eleca.html#circle" on W Beaty's site and it's not sitting well with me. Here is a quote: This doesn't seem right to me. My impression has always been that the charges flow from one of the slots (hot) in the wall socket and return on the other...

Homework Statement This is more of a theoretical question than an actual numerical problem (so mods please move if this is in the wrong place). The circuit below was copied from my book. Ultimately we are discussing the voltage divider. The book goes on to say that V0 is the voltage...

Hi guys, I am Thava. I am working in optical communication. Currently I want to design a circuit to turn of couple of inputs to my laser. Say I have a supply of 5V to two pins of the laser, anode and cathode (pin 1 and pin 2). And then a bias current to another pin (pin 3). At some...

Hi everybody... I have a question in the electrical circuits .. When i combine two resistors ,either they are in series or in parallel .. Is there any constrain to put the polarities ?

Hello, I feel like an idiot because I can't answer this myself (I forgot my high school physics). I have a stereo amp head that has two speaker outputs at 75w each. Each of these outputs has a resistance of 8 ohms each. My cab, however, is mono, and only has 1 speaker input. The cab I own is...

Lets say I have the following quantum state: \frac{1}{\sqrt{2}}\left| 000\right\rangle + \frac{1}{\sqrt{2}}\left| 111\right\rangle And that I apply a Hadamard gate to each of these qubits (H[1,2,3]). The math shows that the resulting state will be: \frac{1}{2}\left| 000\right\rangle +...

Can you make a microwave oven by taking a microwave generator and attaching one lead to one side of a metal box, and the other lead to the other side of the metal box, and putting food in the box and flipping the switch on? If this is possible, can you take a can of food and put two leads across...

Homework Statement here is the circuit >>> http://www.4shared.com/photo/F3ewfm_3/22_online.html the whole question is here >>> http://www.4shared.com/document/Qwxgzq78/Circuits_for_Modeling.html whats assigned to me is #22. anyways, what we need to get here is the differential equations...

I'm trying to understand the concept of a control system in electronics. In a control system, we have a substractor, forward path and feedback path. The forward path is described by a function g ( a gain function ) and the feedback by another function ( gain again ). The input is Xi and the...

Hello Forum, the formula for skin depth is both inversely proportional to conductivity and frequency omega. There seem to be 3 cases when the skin depth of a metal is exactly (or tends to) zero: 1) if an EM wave of frequency f (any frequency) is incident on a perfect metal wall (infinite...

Current flows... But Flux doesn't flow in magnetic circuit. It is a sense of electrons being divided in parallel circuits. We don't have any such in Magnetic Circuit like electrons in electric circuit. Then Why does the flux divides in Parallel system of magnetic circuit?

Hi All, I'm a student and I work with Multisim - I want to create a Simple 7 segment circuit using the Multisim I have created the circuit step by step looking at a circuit in a datasheet of the 7 segment - and it didn't run at all. Why? (see picture attached) Can someone help me with that...

Homework Statement I'm looking for the maximum power transferred to resistor R. I know how to approach the problem, but not getting the right answer and was wondering if someone could just look over my work. http://img854.imageshack.us/img854/1412/screenshot20110604at115.png Homework...

Homework Statement Find the equivalent resistance seen by the source and use the result to find i, i1, and v. Homework Equations V=IR for series circuits: RT=R1+R2+...+Rn VT=V1+V2+...+Vn for parallel circuits: IT=I1+I2+...+In 1/RT=(1/R1+1/R2+...+1/Rn) The Attempt at a Solution since 30Ω and...

Homework Statement The fundamental concept of charge and energy governs CMOS digital circuits. Your company is excited about the possibility of a truly superconducting three terminal device (i.e. a MOS device with zero on-resistance) to make logic circuits. The argument is that such a device...

Homework Statement A source of variable potiential difference is attached across the ends of 1.0 m of resistance wire and the potiential difference across the wire is steadily increased. Describe how the current through the wire changes and provided that the temperature stays the same, what...

Hello, in an introductory course on electricity, it is typical to use Kirchhoff's laws to write a system of equations for a complex circuit having several known emfs and resistors from which the unknown currents are then found. Is this something electrical engineers sometimes do in their work...

Does anyone know of any instance where the the time constants of two RC circuits in series is additive. It seems that when R1=R2 and tao1~tao2 this holds?

Homework Statement Why 220-V circuits used for such devices as electric clothes dryers and stoves? What differences do you expect to find in the wire used for these circuits compare to 120-V lines? Homework Equations The Attempt at a Solution clueless

Resistor Capacitance Circuits.Say there is a resistor before a capacitor connected in a wired circuit; and there is a battery as the emf source (10V for example). How can the capacitor be charged to approx. the voltage of the battery if the voltage drop across the resistor = the voltage of...

Hi guys I really need some help to finish this on time, 1. A circuit with V volts and a 2 ohm resistor and a 2mH inductor and a 500uF capacitor in series. There is a graph of current through circuit over time, starting at 0 current icnreases to 20 amps in 1 mS stays there for 1 ms then goes...

A simple electric circuit (such as one composed of a battery with Emf V and resistor with resistance R) is in an electrodynamic state since the battery's potential difference creates an electric field in the circuit's wires, which in turn moves charges around. So potential difference in wires is...

Hey there, I've been learning about AC circuits recently and while considering and LCR circuit it occurred to me; it's possible for the voltage drop across a capacitor/inductor/both to be greater than the voltage source itself however I can't think of the reason for this, any hints or reasons...

Hi, Is there a way or reasonably priced equipment out there that can measure the energy levels of transients in electrical circuits? Any help would be appriciated!

I looked this up, and found that it limits the current going through, but say if we have a c ircuit with a power source and 1 resistor, the current through the resistor is the current coming out of the resistor. I know if you hook the resistor up in parallel that is not the case, but in some...

Can anyone please explain to me why in a RL circuit, using higher values for resistance will shorten the transient response in the inductor? I've read and found a site claiming that it "reduces the amount of energy the inductor can store", can anyone expand on this a little?

EDIT: I was being stupid and forgot the first diode would turn off after i worked out stuff for diode C, thanks anyway, solution found!Hi I'm having some trouble getting the correct output voltage when i model the diodes using a voltage ofset and resistors. A = 4V, B = 2V, C = 3V Using Voltage...

Homework Statement In the problem there's a circuit pictured with 3 resistors and three ideal batteries (emf = V). I need to calculate the current through all the resistors (I1,I2,I3). Homework Equations I1 - I2 + I3 = 0 V=RIThe Attempt at a Solution left loop is 92V - 140*I1 - 210*I2 + 55 = 0...

I'm looking for information on how hot swap PSUs as used in computers (used typically for data center servers) are designed. In particular, I want to focus on the common aspects between the 2 or more PSU subunits that can be swapped. What kinds of connections are made between the individual...

Hi, I'm confused with the solution given for this practice problem. All of these components are said to be in parallel, yet the current is worked out only across the resistors. I thought the inductor would be a short circuit to DC. Am I looking at this backwards, is it modelling the inductor...