Circuits Definition and 1000 Threads

Homework Statement I need to find the voltage Vx. Vs = V0*cos(wt) given: w,R,C,L,V0 I thought doing KVL,KCL but got stuck... is this the way to solve this? is there another way? Thanks!

Homework Statement Find the logic function (without body effect) Homework Equations Nmos, Pmos current equations (in each state of the transistor). The Attempt at a Solution I am looking at the circut and get confused :( don't know where to strart from... help please? ...

The reason why I am suspecting the solution is wrong is because the final step is dividing something with units of electrons/min by something with units of electrons/meter. Am I right about the solution being wrong? If I am wrong, then what am I not seeing? If I am right that the book is wrong...

Homework Statement Homework Equations I am trying to do some self study here before I take my circuits course. I am stuck on this problem for some reason.. The equation I am coming up with for the node is : 6 - Vo/2 - Io/4 - Vo/8 = 0.. After getting at equation I can't seem to come to...

When discussing the i (the imaginary unit) in a math class, my math teacher commented that that complex analysis is used in studying electrical circuits. I know a little about resistors and what not, but never have I seen complex analysis used this way. I've tried looking it up, but it's been...

What happens to the system response if all four resistors are equal. One of the resistors is an RTD.

Heya! I've got a lab practical tomorrow to do with RC circuits, what do the terminals at the top and bottom of a filter circuit diagram mean, I'm assuming Vin and Vout is the voltage in and then 0V/ground, but what do the bottom two terminals correspond to? Cheers

Homework Statement For the circuit shown, find i(t) for t>0 http://img440.imageshack.us/img440/5158/cicuit.jpg Homework Equations To simplify the resistors we use a Wye-Delta transform so: R1 = RbRc/(Ra+Rb+Rc) R2 = RcRa/(Ra+Rb+Rc) R3 = RaRb/(Ra+Rb+Rc) Then the Kirchoff current...

Homework Statement I'm curious about infinitely(?) long LC Circuits. Say you have a circuit (and I am going to describe this sort of like a matrix) with capacitors on the top row, inductors on the bottom row, and one inductor in each column. Assume a current with value "i" is going up...

Homework Statement A series RLC circuit has an electromotive force given by E=200e^(-100t) V, a resistor of 80 ohms, an inductor of 0.2 H, and capacitor of 5x10^-6 F. If the initial current and charge on the capacitor are zero, find the current at any time t>0. Homework Equations ...

A series RLC circuit has an electromotive force given by E=200e^(-100t) V, a resistor of 80 ohms, an inductor of 0.2 H, and capacitor of 5x10^-6 F. If the initial current and charge on the capacitor are zero, find the current at any time t>0. How on Earth do i start this?!

Hi, New member here! Ok, this is a textbook question which I need help with as I am self teaching myself Linear Circuits. I have an exam in a week and I wanted to clear out some questions I had. Homework Statement textbook question...

Homework Statement What must the emf ε in the figure be in order for the current through the 7Ω resistor to be 1.79A ? Each emf source has negligible internal resistance. Homework Equations V=IR Kirchoffs junc and loop rules The Attempt at a Solution I put that the outer...

Hey, I know you have a rule requiring an attempt at the problem before posting here. The trouble is, I have a department required simulation project due this Wednesday and my professor is very behind in her lectures and has yet to even mention transient circuits. I don't expect this...

Hello all, I'm new to this forum, but I've browsed this forum quite a bit and it has helped me numerous times throughout my years of college. I have a question that I need clarification on with sequential circuits. Synchronous Circuits store "information" using a clock and the added signal...

Homework Statement S1 switch - always close. S2 switch is closed, until the capacitor voltage reaches 2V. given: R,C,V values. V0 = 0V. Need to find Vout while S1+S2 are closed and until S2 opens.Homework Equations Vc(t) = (Vi - Vf)*(exp -t/TAU) + VfThe Attempt at a Solution I have found the...

I need someone to explain how to get the answer for (c) I know its like this (from solution manual)... Va = Vc + 8 + I(1.4 + 5) From what it seems, they are just adding voltage in the counter clockwise direction. How are they doing this? How come I can't add voltage from the clockwise...

Hello! For those that were with me at signals, I passed the exam, but barley. 10,5 points out 20. Going to cancel that exam and do it again when I have the chance. But anyway, back to the topic. I am trying to get the intuition for transient processes in RLC circuits. I was taught...

the equation P = (E2R) / [(R-r)2 + 4Rr] We say that when R=r , P = E2/4R which is said to be maximum.. But if I say R→∞ , then r→0 and then P = E2/R which is greater.. So, shouldn't power be maximum for max R ?

I have a midterm in a few days, and I'm having some problems understanding the process behind evaluating circuits. I was wondering if you guys could simply run me through, step by step, how you evaluate a circuit, so that I can get a better understanding? I'm using the Khan Academy site as well...

Trying to understand the power network and synchronous machines, led me to the fact that I am not sure about the basics. The terms the generator is delivering or consuming reacting power made me halt. So I went back to my old course(which I allegedly passed) where the reactive power is...

Hello Everyone! I have recently been attempting to understand negative resistance circuits(on a practical level at least to start). I've pulled up a few websites giving actual circuits to demonstrate the principle, but still can't quite understand it. Every circuit example so far shows either...

Hello, So is there any software, that generates the differential equation for the input circuit? I am trying to solve a problem and I want to check if my equation is right. Thanks.

People usually use an electrostatic voltmeter for direct measurement. I would like to know what kind of charges is on following high voltage circuits. Will it be positive or negative charges? Does anyone have any suggestions? Thanks in advance for any suggestions

Homework Statement Using Kirchhoff's law for nodes A,B,C and D and then Kirchoff's law for the circuits around the main building, the annex and the warehouse, write a system of seven equations that could be solved for the currents I1, I2, I3, I4, I5, and I6 I get (NOTE**the I are capital i...

I'm asked to find an equivalent resistance and the current through each branch of the following circuits. (r is a fixed arbitrary value for all resistors in the circuits) Homework Equations V=IR Sum of I at a node = 0 Sum of V about a closed loop = 0The Attempt at a Solution I've been playing...

Homework Statement Hello, This is part of a set of questions I need to do for a project I just need help getting started. I've been looking at this forever and I can't figure it out. Homework Equations Kirchhoff's Law for Nodes: Current going into a node = current going out...

Homework Statement Maximum current: I max = 4.62 * 10^-4 A Time constant of circuit: T = 3.9 secondsHomework Equations T= RC The Attempt at a Solution I'm trying to find the current after 1 time constant. Seems simple enough, the current changes by 63%. So (Imax)-(Imax * 0.63) or...

Homework Statement The RC circuit pictured below begins with capacitor C completely uncharged. I: What is the current at point A immediately after the switch closes? II:What is the current at point A 'at the end of the quaternary period' (I lol'd when he worded it like that) after the switch...

Circuits / Switches / Currents --TRUE FALSE QUESTIONS (Pic included) Homework Statement Homework Equations The Attempt at a Solution I really have no idea, on going about solving this as I don't have my book with me and the homework is due in a few hours. I'm sure if brief...

Hello, I am hoping someone can break down an equation for me. I am used to Kirchhoff's law in the form of i1 + i2 + i3 = 0 etc. But recently in a High Frequency class, we were told ...'Let us apply the Kirchhoff's law to the equivalent circuit of a transmission line segment of length \deltaz...

Homework Statement Switch S in the figure below is closed at time t = 0, to begin charging an initially uncharged capacitor of capacitance C = 13.0 µF through a resistor of resistance R = 24.0 . At what time is the electric potential across the capacitor equal to that across the resistor...

Hello! If we want to find i3, we can apply the superposition theorem to the circuit below. It gives For V2 set to 0: i3' = V1 / R1 For V1 set to 0: i3'' = V2 / (R1 || R2) i3 = i3' - i3'' = V1/R1 - V2 / (R1 || R2) i3 = 10 / 500 - 2.5 / 83.3 = -0.01A My question is Do the i3' and i3''...

So, in a physics lab I TA, we are doing a lab in which part of it, the students try to do Faraday's Ice Pail experiment. For part of it, they need to charge a piece of metal at the end of a insulating rod. To do this, the guy who designed the lab did the following. He has a voltage supply...

How would I find the equivalent resistance of a diamond-shaped circuit? Is the middle resistor simply omitted? By diamond-shaped, I mean it looks like a Wheatstone bridge, but it has a resistor in the middle instead of a current detector.

I just got my MSP-430 (microcontroller kit with two micros for $4.30) and I' just awestruck by how easy it is to use. I am looking to make a few very low-power circuits here and there for my car. For example, one to lock the doors after 30 seconds when I press a button. What do you guys like...

Homework Statement ceiling light are connected in a parallel circuit, if one of the light bulbs burns out, will the other two bulbs be brighter? pls help me >.< my science exam is tomorrow.:(

Does a spark gap increase the current in a circuit? My thinking is that the surrounding air is ionized and any "stripped" free electrons would add to the current.

So the voltage drops across closed circuits I get that is P = V^2/R to get the power and then you will use P=I^2/R to get the current running through the circuit and in the case the current flowing through the closed circuit is equal in every resistor and so is the voltage drop. The part that I...

while studying. There are three 190 watts light bulbs and a radio with an internal resistance of 46.0 ohms plugged into the living room electrical outlets. You decide to have a break and have a snack, turning on the pop-corn machine that draws 6.00 A. a)How much electrical power are you...

I have not been able to solve these 3 questions. (attached) I understand that parallel circuits can be identified by checking if there are branches at a particular point, but I am still unable to simplify these circuits and solve these questions. Any help would be greatly appreciated! Thanks! :)

Hi Everyone. This is my first post on here. I'm currently doing an Electronic Engineering Diploma, but am struggling with just one thing (so far). Circuits and their equations. Everyone in that class are struggling, and I feel it may have something to do with the lecturers technique...

I have two problems of electricity: 1. http://i56.tinypic.com/2a6rnzs.jpg" i.Use Kirchoff's first law to find the current through the 4.00 ohm and 8.00 ohm resistors ii. Calculate the emf E1 iii. Calculat the emf E2 iv. Calculate the current through the 12.00 ohm resistor 2. A student builds...

Homework Statement I attached the problem I don't understand why the 3 resistors at the top end up being in series for part b. can someone explain that to me. Homework Equations The Attempt at a Solution

Hi all. I am a student taking A levels, I was hoping the forumites here could help me answer some doubts that I have regarding the concepts above. 1) Waves It was mentioned that the distances between resonances are half a wavelength. For example, in a water tube with a sound source...

Homework Statement Draw a logic circuit for the boolean function ((p+qr)')(pq+r) do not simplify the function first The Attempt at a Solution I got this: http://screencast.com/t/BC4akgo9J but I'm pretty sure it's wrong because of the first part how the bar goes over the whole...

This is an easy one for those familiar with integrated circuits, but it's been bugging me. Say you build a circuit out of NAND gates, which have two inputs and one output. Doesn't this mean that the circuit as a whole has multiple inputs (or do some of the outputs loop back to the inputs so...

Capacitors 1, 2 and 3, have capacitances equal to 2.00 μF, 4.00 μF, and 6.00 μF, respectively. The capacitors are connected in parallel, and the parallel combination is connected across the terminals of a 200-V source. The capacitors are then disconnected from both the voltage source and...

Homework Statement When dealing with magnetic circuits, if the question explicitly states to ignore fringing, then the flux density of the gap will equal the flux density of the core, correct? In fact, if there are ever more materials, the flux density throughout the entire circuit (series)...

My teacher was going over a thevenin and norton circuit and i understand the thevenin and norton part of it, but the part that confused me was when he did the node voltage at the 2 circled nodes to find Ix. I understand why the bottom node would be zero because it is the reference node but why...