Circuits Definition and 1000 Threads

Homework Statement http://imgur.com/iTHbpTv This picture contains the circuit drawn out, and all the provided numbers. It also includes some of my work. Homework Equations I=V/R P=I*R The Attempt at a Solution So I attempted to reduce it down to one resistor & one battery (26V...

Homework Statement http://postimg.org/image/p14d9faf9/ The top two resistors are in parallel, so their equivalent resistance is 0.6 ohms. But if you were to draw the equivalent circuit, where do we place this equivalent resistance? can it be placed either where the 1 ohm or 2 ohm...

Homework Statement Design a voltage divider to provide a voltage of about 5V (±10%) across the variable load. The load-current demand varies in the range of 0 to 5 mA and the available dc-supply voltage is 15V. Homework Equations The Attempt at a Solution Here is the circuit...

I am not understanding how Rth is calculated.. What I've been doing is visualizing the path that the current would make. Rth is then the equivalent resistance of those resistors that current travels through. Is that how it's suppose to be done? Anyways... if you look at my pictures... the...

So basically I'm in the 1st year of EE and we're going to design the wiring diagram. Pretty much all we put at this stage are grounded electricity sockets, lights, water heater, and the oven. The problem is that the book that I've gotten from my school is 95% about mechanical drawings, which...

I am trying to solve for isc. The correct answer is isc = 6mA but I got 0 mA. My equations must be correct... If they are not please someone explain why. Thank you.

Homework Statement Here is a picture of the diagram. http://gyazo.com/f1b7051fda5b9e1d3a185c53abde1211 I must use the Gauss Jordan elimination method and solve for X1, X2 and X3 I am having problems setting up my equations Homework Equations The Attempt at a Solution...

Homework Statement Homework Equations The Attempt at a Solution I am trying to compute ##I_N##. I connected nodes a and b. The circuit after some simplification: $$\frac { 180-{ V }_{ 1 } }{ 20 } =\frac { 120-V_{ 1 } }{ 40 } \\ { V }_{ 1 }=240\quad V\\ \\ R=\frac { V...

Homework Statement Homework Equations The Attempt at a Solution I am trying to find the equivalent resistance for part b. First, we turn off independent sources. We open circuit the 2A source and we close circuit the 30V source. We're left with two resistors. Are they in series or parallel...

Homework Statement Homework Equations The Attempt at a Solution I got ##R_{ th }=4\quad Ω## easily but I am having trouble finding ##V_{th}##. Assume the negative terminal of the 32V voltage source is ground. Here is the nodal analysis at node 1: $$\frac { 32-V_{ 1 } }{ 4 } +2=\frac { V_{...

Homework Statement Homework Equations The Attempt at a Solution How does the author do the below? $$v_{ i }=2li=42V$$ What equation is he/she using?

Homework Statement Homework Equations The Attempt at a Solution Here is what I don't understand: how can this circuit exist? If you look at the V2 node, there are 3 currents going in but none going out. Isn't this a contradiction? From what I've heard, you can arbitrarily...

Homework Statement Homework Equations The Attempt at a Solution Attached to this post. I have calculated the power absorbed for the 6S and 5S resistors but not the 3S resistor.

Homework Statement Find the transfer function, G(s) = \frac{V_{0}(s)}{V_{i}(s)} for each network shown in figure P2.3. [Section 2.4] http://imagizer.imageshack.us/v2/800x600q90/20/1ocq.png Homework Equations The Attempt at a Solution When I try and solve this problem I...

These are 2 stand alone problems, however the answers disagree with one another and I am trying to reconcile their differences. Any insight would be appreciated! :) The answer is C. The answer provided with this question is that "there is no dependence on resistance of any kind". However the...

Hello all, A quick question: I am trying to come up with a valid explanation of a question posed to me regarding series circuits. It was deceptively simple but unsure how to address it. I would very much like any thoughts on this: how do the charges 'know' to give only some of their energy...

Circuit Question -- Combining/Redrawing Circuits I don't understand how they the circuit on the left was redrawn to be the circuit on the right. 1. How did they know R1 and E1 were parallel to R2 and E2 and the 6 ohm resistor? 2. How did they know that E1 should be position as it is in...

Hi all, I need serious help here. I have to build two types of circuits as shown in the attached. The second one shows the circuit when the comparator's output is returned to the CLP. The IC's used here are IC 85 and IC 393 and the prototyping board used here is NI ELVIS 2. I think I have...

Homework Statement Determine Vy in the circuit of the below figure: (In attachment) Homework Equations ohms law resistance adding equations for parallel and series The Attempt at a Solution So I found Vx=(1.2A)(5ohms) = 6v Afterwards I computed the current supplier: (6)(0.1)=0.6...

Determine the voltage with respect to the ground at each point in figure. Assume the practical model. guys please help me solve this circuit. anybody in electronics engineering help.

I'm kind of struggling in my thermodynamics and circuits courses. I was wondering if anyone knew any great websites that teach and explain the stuff well

Problem statement What would the voltmeter on the parallel circurt read? In the diagram. Revelant equations : V=IR Attempt at solution: Just wanted to confirm a fact : the 10 V given in the circurt drawing would be the drop in potential meaning that it lost 10 V so the potential energy...

Homework Statement Determine the voltage drop across the resistor when the capacitor has been discharging for 10μs. Capacitance=400 pico farad and is charged to 10v through a 50kΩ resistor. Homework Equations Vr= V*e -t/CR The Attempt at a Solution Vr = V-Vc at the instant of 10μs...

Homework Statement Determine the current flowing when the capacitor has been discharging for 5μs Capacitance=400 pico farads which is charged to 10v through a 50kΩ resistor. Homework Equations Vc = ve-t/CR The Attempt at a Solution So Vc =Ve -t/CR -t/CR =...

I have a circuit and in the circuit there is two over lapping circles and I'm not sure what it is because there is no description or anything. I think it is a current or something but next to it is the symbol gm *Vbe and I know Vbe is the voltage between the base and emitter but what is gm?

Dear all, I have problem to find the differential equation for my circuit shown in the attached picture. For input I have a current source, and the output is the voltage U (the voltage between the first and the ground node). I need the ODE to find the mathematical response of the system...

Circuits are used to get electricity to the right conditions needed for a certain product, this I know. But, why are there so many resistors, capacitors, integrated circuits and transistors instead of one of each to get the electricity to the right voltage, current, etc. I know this is probably...

My question is just like my title. Do electrical engineers do anything besides circuit work? Because I would like to learn more about guys career but circuits is all I find.

Homework Statement I have a general question concerning circuits. I am a bit confused as to how to determine when the current is negative. For instance, on circuit diagrams, we are shown arrows that indicate the positive direction of current. Then, when we open the switch on the circuit...

The term ground has always confused me. For instance: I have always thought of a battery as a collection of negative charges at the -pole and positive charges at the +pole. But with this picture what does it mean that one pole is grounded. To be grounded is I guess ideally to be connected to the...

In an LCR circuit (circuit with inductor, capacitor and resistor), are the following statements always true? The capacitor voltage always lags the resistor voltage by a phase difference of 90°. The inductor voltage always leads the resistor voltage by a phase difference of 90°. The current...

Homework Statement In the circuit below, determine the current through the diode http://img12.imageshack.us/img12/152/jar0.jpg Homework Equations V:IR 3V: Va+Vb The Attempt at a Solution This is my first time trying to solve a circuit problem involving diodes. I first tried to use...

Hi guys, i need some help here... 1. I know that by convention, the positive charge of the voltage source is taken to be the direction of current, but I'm confused by this MIT lecture vid that drew the current as appearing to be flowing from the negative terminal. You can see the drawing in...

Hey PF! I have a test tomorrow and some of the material is on the basics of RL and RC circuits set up as high pass or low pass filters. Does a High pass filter bode plot look the same whether it's RC and RL? Same with a low pass? Can anybody to an online resource of what bode plots look like...

Homework Statement Plot I_r vs. time and Q_c vs. time starting from when the switch is moved from its lower position to its upper position. Label both axes with numbers and units. Show three time constants. Assume that the capacitor is initially uncharged. After the circuit reaches its...

Homework Statement Find the voltage gain A_{v} http://imageshack.com/a/img692/3117/qkwp.png Homework Equations The Attempt at a Solution Is this the correct small signal equivalent? http://imageshack.com/a/img203/5812/1yfe.png I'm trying to find the output impedance...

Hi, Homework Statement Attached (Q1,Q2) are two mechanical systems I am asked to convert into analogous electrical circuits. In Q2, it was stated that B4 is the friction between each of the three masses and the surface. Homework Equations The Attempt at a Solution Attached (Q1 -...

Can someone link me/explain to me the proof of this theorem? I can't seem to find it online. Thanks! BiP

I can't answer Q3 of: A spin-drier has a start-stop switch, but the motor will only spin the drum if the lid is closed. Closing the lid closes an SPST switch inside the machine, and the motor can then be started with the start-stop switch. 2) Draw a diagram of a simple circuit for this...

Homework Statement Given the configuration below http://img844.imageshack.us/img844/3364/c5e8.png Find A_{V} and A_{I} Homework Equations The Attempt at a Solution I start off by drawing the small signal equivalent r_{e} model. http://imageshack.us/a/img268/7201/9e.png I start off by...

In a single circuit I've always understood that a neutral was a return essentially completing the circuit for the current to flow but I know that losing a neutral can cause imbalanced load and burn up equipment, my question is, how is this possible? If I were to open the hot, it would simply...

I am having trouble understanding short circuits and would appreciate some help with it. From what I understand, a short circuit occurs when we have a connection with a very low (zero) resistance is made between two points in a circuit. With R=0, the only resistance in our circuit would be...

Homework Statement Determine A_{V} and A_{i} given β_{D} = 8000 and V_{BE} = 1.6 V. http://img801.imageshack.us/img801/6272/44tv.png Homework Equations The Attempt at a Solution I'm not exactly sure how to solve this problem. This is a problem that my professor solved in class. The only...

Hello Guys ! In This photos i found that in (a) : RT= 4 Ω+ 10 Ω+ 4 Ω= 18 Ω and in (d) : RT= 10 Ω but i can't understand why in (a) the total resistance equals to 18 and how will the current would pass ?? and in (d) i can't understand why the total resistance equals to 10 and why we...

Find the simplified equation (SOP FORM) corresponding to the following circuit (i.e. apply Demorgan's theorem to bring the negations inside the parenthesis). So is it saying W NAND X which means (w!x!) + YNORZ so (w!x!) + (y!z!) = wxyz?

A cheap way to implement this circuit is to use only NAND gates. Draw the circuit diagram for the lowest cost implementation using these gates. (reminder: you can wire a NAND gate such that it acts like an inverter). $f$(w,x,y,z) = $$x*y + w*x + \bar{y}*\bar{z}$$ My solution: Will this work?

Homework Statement Determine the T-network equivalent of the ∏ (Pi) network shown in the Figure? Homework Equations I started working on this question and don't know if I am heading in the right direction. The impedances of the T network (Z1, Z2, Z3) can be found from the impedances of the...

Hi guys, How are you all? I am trying to build to a PLL circuits. As part of the circuit, I will need an offset adder, integrator, rectifier, and another stage of offset adder. I haven't done circuits for very long time. So please bear with me if I am mistaken. Appreciate your help. I...

My question is why did they choose to calculate the voltage across a circuit element as vi - vf because it seems contradictory. More detail is in the document. Someone please answer because this has been bothering me. THank you.

Currently using resources like: http://www.matterandinteractions.org/Content/Articles/circuit.pdf http://www.phy-astr.gsu.edu/cymbalyuk/Lecture16.pdf I don't seem to understand why the surface charge densities shown in the pictures are stable. I understand that the densities shown create...