Circuits Definition and 1000 Threads

Homework Statement A capacitor (A) of capacitance 4.0uF is charged to a potential difference of 20V. An uncharged capacior (B) is connected in parallel to capacitor A. What is: (a) the initial energy stored on capacitor A (b) the p.d. across A after B has been connected (c) the final energy...

Hi everyone. I have to say I never get satisfied with introductory explanations of how electric phenomena occurs. Specifically, I would like to know how Quantum Mechanics explain the raise of a electric current and especially what makes a resistor being (maybe) the most dissipative element in a...

Helo, I am in an electronic course and we just started studying diodes. I am stuck on the following problem: Place a 100 ohm resistance in series with a diode, and plot current versus voltage across the series combination. I am also given the following values for the diode: n = 1, Is =...

Homework Statement Consider a potential divider circuit with an LDR and a fixed resistor. The circuit is powered by a battery which has an emf of 45V with negligible internal resistance. (a) Describe and sketch a circuit that could use a voltmeter or an ammeter to act as a light meter such...

First a little background. In my lab physics class we performed a lab to determine the Feigenbaum constant. I decided to do my research project on period doubling in non-linear circuits. I started thinking about the RLD circuit and how I could make it more interesting by adding different...

I'm sure we have all seen the frequent questions from students who don't understand the difference between potential and voltage in a circuit. They seem to think that zero voltage has physical significance. Even using the phrase "voltage drop" is not suffienct, because they say, "What happens...

Homework Statement Homework Equations For a basic RC circuit during charging: q = CV(1-e-t/RC) i = V/R (e-t/RC) The Attempt at a Solution I can solve basic RC circuits but this is just out of my realm of understanding. I can also find the max charge of the capacitor. I'm not looking for...

I would like to start building small electrical projects but it's been a very long time since I studied circuit analysis in college. I figured that there are probably some computer programs that would help people like myself to design simple circuits. A quick Google search led me to this site...

I work with max. 18 V, hobby. Don´t want to mess around with AC. Which integrated circuits to buy to learn/ experiment with: -comparator -opamp -voltage regulators -voltage stabilizers -optocopler -CMOS -TTL -A-D, D-A converters -microprocessors -temperature sensors -timer -quartz crystal I am...

At my school we have started a program where we have one class a week on building circuits and playing eith the applications of circuit parametres. I would like you to tell me if there is a program, website or an app that can provide me with lessons or ability to build circuits of my own and...

I have a question regarding the voltage of two different circuits. In the first circuit there is a 75 volt battery with just one 4 ohm resistor. In a separate second circuit there is a 75 volt battery again, but this time there is a 4 ohm resistor and 9 ohm resistor in series. My question is...

Homework Statement http://i.imgur.com/zXJpa9J.png Homework Equations It = vT/rT P = I^2R The Attempt at a Solution http://i.imgur.com/zXJpa9J.png This is the question at hand. I've solved them all and I have a question for part c and d. Since the capicators are fully charged, the circuit...

I wonder if anyone can explain how to actually synthesis a quantum circuit, what I mean by this is that given some requirements, I am able to write the matrix form of the circuit needed, but I have no idea how to turn that into a list of gates. For example: Build a circuit that performs the...

Okay, so why is it that Vc assumed to be 12v - 0.7v (D1), how about contribution from the 9v battery?? Why is this not affecting the voltage at node C? Why Vc isn't 9v - 0.7v (D2) = 8.3v?

Homework Statement Solving for this circuit here, where V = -5V Homework Equations The Attempt at a Solution I found the equation for a summing op amp like this one, plugged everything in and ended up with -3V, which is marked wrong. I'm really at my wit's end here and the homework has been...

Homework Statement [/B] Derive an expression for vc(t) in the circuit of Figure P4.13 and sketch vc(t) to scale versus. I attached a screen shot of the circuit for this problem. time. Homework Equations V = IR V = V0exp(-t/tau) The Attempt at a Solution [/B] I am trying to find the...

Hi, In this Raspberry Pipboy Project, Niel Corbett attempted to recreate the pip boy as a real life functional device, and in this project he is using two rotary encoders. Here' the link to the code for his project...

Homework Statement I am practicing questions from the book in preparation for an exam, and I am having trouble with this one Homework EquationsThe Attempt at a Solution According to my professor, the answers are: R1=12ohm, R2=9ohm, L=34.28 H So far this is what I have done: Voc = 6V τ = 20/7...

Homework Statement In the tuned circuit below, what will happen to the reading of the ammeter when: a) source frequency increases. The voltage is constant b) the capacitance increases. The voltage and source frequency are constant c) The voltage increases. Source frequency is constant...

Homework Statement Homework Equations The Attempt at a Solution My problem lies in when I get equations like: and if I plug in Vi and its derivative, I get equations like: How do I solve for t in these equations if I have a sine and a cosine term that contain t?

Homework Statement [/B] My question is regarding part C of the question. Homework Equations V = IR V(t) = V(1-e^(-t/tau)) The Attempt at a Solution My idea is to use Kirchoff's Voltage Law and find the voltage of the capacitor as a function of time, then since the voltage across capacitor is...

Homework Statement In the following picture, the absolute value of the difference in electric potential, between points A and B is: A)5V B)4V C)3V D)1V E)0V Homework Equations E =qV V = iRThe Attempt at a Solution I have no idea where to start on this one, just started my electric circuits...

I'm having real trouble understanding some concepts in RLC circuits. If I have a circuit like this. The effective voltage is 120 V. What is the required frequency for resistor to release power of 250 W? I want to really understand this on a deeper level so please make the explanation...

Homework Statement This is just one of the example problems in my book which is already solved for me, but I don't really understand their solution which I'll post here: They start out with assuming Vin is very negative, which makes D1 turn on and makes Vout=VD,on+Vin. THen they solve for...

Say you have two separate resistors in a circuit. When you close the switch on the circuit is it the electric field that flows through the circuit that effectively sets the voltage drops so a bigger voltage drop occurs across the higher resistor in proportion to its resistance such that the...

Assuming the resistance of a wire in a series circuit, consisting only of 1 component (e.g. filament lamp) and a battery, is negligible; does each Coulomb of charge commit all of its electrical potential energy, supplied by the battery's potential difference, as work done across the component...

Homework Statement [/B] 2. Homework Equations Req= R1 + R2...Rn for resistors in series. Req= (1/R1 + 1/R2 +... 1/Rn)^(-1) for resistors in paralel And Ohm's Rules for circuits The Attempt at a Solution I did manage to solve it by using R3= 0 and thus finding R1= 2000 by using Ohm's Rules...

It seems at first sight of the first circuit that all the resistors of resistance r are connected in parallel and i have thus simplified it to the second circuit. But then on numbering the nodes and redrawing the circuit i got the third circuit. I got the same equivalent resistance for all the...

Homework Statement Suppose you have two “D” cells and wish to use them to power a light bulb. The two batteries can either be connected in series or in parallel. (a) In order to achieve maximum voltage, how should the cells be connected? Explain. (b) In order to achieve maximum power, how...

Hi, do you have any recommendations of books that deal with circuit analysis and circuit solving? I'm currently involved in a course that deals with linear circuits, and we are learning all of these methods of loop currents, thevenin's and norton's theorem, potential of knots and lots of methods...

Homework Statement The following picture illustrate how the current in the circuit changes when you change ##E_2##. Where slope 1 represents the current flowing through ##E_1## and slope 2 represents the current flowing through ##E2## Homework Equations Usual circuit laws :P The Attempt at...

Homework Statement (a) Apply Nodal Analysis, writing down the equations which determine VA and VB, the voltages at nodes A and B [8] (b) Find values for VA and VB. [4] (c) By calculating the currents supplied by the 44 V and 2 V sources, or by any other means, calculate the total power...

Homework Statement A certain circuit has a resistance of 30 Ω, inductance of 5.0 mH, and capacitance of 0.375 µF. At time t=0, the capacitor is charged with 4.0 µC on the top plate (and -4.0 µC on the bottom), and the switch is then thrown so that the capacitor can discharge through the...

Homework Statement I am practicing these types of problems, for example: and I am asked to find i(t) in this case, and it is in steady state. I really need someone to walk me through these types of problems, how do I get them started. Homework EquationsThe Attempt at a Solution I am really...

Homework Statement Prove that $$(\bar{a} + b)(b+c) + a\bar{b}$$ where ##a,b## can be from the set ##B\in\{0, 1\}## equals $$a+b+c$$ Homework Equations Rules of Boolean Algebra 3. The Attempt at a Solution [/B] My attempt: ##\bar{a}b + \bar{a}c + bb + bc + a\bar{b}## ##b(\bar{a} + 1+c) +...

Homework Statement We were given five samples of nichrome wire, each with a different diameter but the same length. A micrometer was used to measure the diameters. We then measured and recorded the electrical resistance, R in Ohms of each nichrome sample with a DMM. I will try to summarize all...

Electric potential energy in circuits. Here is what I know: The electric potential between two points is the work done against electric forces to move that mass of charge between those two points. What does this mean in a circuit? I know basic things about electric field, the test charge...

Homework Statement Homework Equations V=IR The Attempt at a Solution I have tried my best but can not figure out how this circuit works. Is the 2 1Ks in parallel? Why does the 1k with the voltage source have higher current?[/B]

Homework Statement To analyze these circuits, we need to draw the current path right? I know that current can only flow one direction through a diode. http://i.imgur.com/kipBcax.pngHomework Equations N/A The Attempt at a Solution Are these paths correct? Green = positive, red = negative 1...

Hi. There's this nice water circuit model for electric circuits where pressure corresponds to electric potential and the (mass or volume) flow rate to electric current. In the water model, we can vary the pipe diameter along the circuit. Since water is practically incompressible, the flow rate...

Homework Statement (a) The NOR gate combination in Figure 1 acts as an AND gate. Copy and complete the truth table. (b) An aircraft door is locked by two bolts A and B each of which operates a sensor giving a logic 1 when the bolt is fully inserted. A further sensor C gives a logic 0...

Homework Statement So our lecture introduced first order circuits to us. We are trying to solve for v(t) in the following circuit. However in the notes he gets it into a form in which we can solve for v(t). However I can't seem to get it into the same form he has. This is more of a maths...

Homework Statement Homework Equations Ohm's Law : V = IR, Eel = VIt , Vt=ItRt , Q=It The Attempt at a Solution I tried to do the first question letter a I=? I= V/R R=3 ohms I= 6/3 V=6V I=2A[/B] i don't know how to continue the others :/

Homework Statement A= 400mm^2 d=7.5mm v=1.5 kappa= 4.0 offset=8.00mm [/B] Click on the dielectric tab. Configure the single capacitor circuit by using the parameters given in the circuit diagram to the right. This capacitor with its offset dielectric slab is equivalent to two component...

Homework Statement Solve this circuit: a) Mark all currents b) Write a system of equations allowing you to solve for the currents2. The attempt at a solution Part a) in attachment. Part b) \epsilon_1 = i_1 r_1 + (i_1 + i_2 + i_3) R \epsilon_2 = i_2 r_2 + (i_1 + i_2 + i_3) R \epsilon_3 =...

Hey, I am having problems with this. I need help with these 2 circuits I am basically lost and not sure how to start. I need to find voltage, current and potency on each resistance help would be much appreciated, thank you http://imgur.com/trm1On0 http://imgur.com/a/KD3zr

Homework Statement For each of the circuits, draw the waveform. The voltage drop across each diode is 0.7V Homework EquationsThe Attempt at a Solution I know that both of these are using diode bridges, but is there a specific name for these circuits? I think the waveform for Vo1 and Vo2 are...

Homework Statement http://imgur.com/a/4YfkJ http://imgur.com/a/4YfkJ Homework Equations for t<0 I understand that Capacitor acts as an open circuit and goes away but why did the 90v and 6ohm resistor disappeared? is it because current doesn't go that way? and also in that KCL at node V1...

Is it possible to create a series of circuits capable of detecting a moving object with 3 levels of proximity e.g. green light when object is 10ft. away, yellow light at 5ft., red light at approx. 1ft. away, etc? Thanks, Dave

Homework Statement https://s10.postimg.org/lb6n94ua1/20161007_190700.jpg Homework Equations V=IR The Attempt at a Solution So far I haven't had any problems finding the Req. However, I am having trouble with the VIR chart. Can anyone confirm whether or not I did it correctly. My thought...