Circuits Definition and 1000 Threads

Homework Statement This isn't a homework problem per say but I am struggling with what we are doing in class at the moment which is to do with circuits with two sources of Emf. More specifically, how one source can be used to re-charge a battery. I have looked at the following website which i...

Homework Statement A transformer has a turns ratio of 5 : 1. It is connected to a 230 V supply and an output (secondary) current of 2.7 A is measured. If the transformer is 90% efficient, calculate: Secondary voltage Input (primary) current [/B]Homework Equations...

Homework Statement The resistor R in the above figure has a resistance of 19.1 Ω. a. Find the current in the resistor R. b. Find the current in the 10-Ω resistor. 2. Homework Equations Kirchhoff's Laws (Junction Rule and Loop Rule) V=IR The Attempt at a Solution I figured out part a (I...

Homework Statement 2 different questions that I'm using to test my understanding of the physics concepts rather than the math: 1) How does the brightness of bulb A compare to that of bulb C? After D is added how does the brightness of bulb A change? Does the brightness of B change? Does...

Hey guys, I'm in a pickle with this question. Its really not my cup of tea, its a struggle factor really but I don't really have a choice whether I like it or not. A worked example such as this allows me to see what it is I need to do. If anyone can provide a helping hand it would assist me...

Hi, so I've just started learning about physics and I get the gist of most of it. I understand motion, torque, energy, light, radioactivity. But there is one topic that absolutely stumps me. Electricity. Can someone explain to an absolute moron like me what it is? It seems like everyone around...

Homework Statement . [/B] This is problem 7.45 in Fundamental of Electric Circuit 5th edition. 2. Homework Equations First off, I want to go ahead and say that I don't need the solution I already solved it. I went ahead and used Nodal analysis when Vs = 30. I placed a node voltage right...

As I am sure everyone is aware, there are still folks who don’t believe SRT and GRT. While 99.9% of them are nut-jobs, there is at least one that I respect – Tom Phipps specifically. I am not familiar with any of his writing before the advent of the GPS satellites. In any case, he now accepts...

Hi guys! I'm making my Phd on cavity QED but wish to move towards superconducting quantum circuits, could you give me some good references (articles or books) at an introductory level (for self-study)? Thanks in advance

Homework Statement FIND i(t). [/B]Homework Equations VL = L*(di/dt) (Equation 1) IC = C*(dV/dt) (Equation 2) I(t) = e^-9*t*(A*cos(4.359*t) + B*sen(4.359*t)) A (Equation 3) The Attempt at a Solution I can get the exact value of the constant B as shown in the answer if I use -6 after the...

hi, so i want to be able to run a motor depending on whether or not an IR detector senses IR light. so the basic idea at the start was to connect the motor with the detector and a resistor in series and therefore if there is IR the current will flow turning on the motor. I then learned that the...

Hello everyone, Imagine two points that have a Electric Potential Difference of 10V and they are connected through a conductor wire. Let's call these points A and B: Now imagine we have a charge on A of 1C. To move the charge to B, we need to make a work of 10J, right? So, now, imagine the...

I have a few questions about how a series circuit works. I've attached a picture of a series circuit on this post. First of all I'm a little bit confused about voltage. If I'm correct, voltage is electrical potential. For example there is a voltage between two electrons being pushed close...

Hi I got stuck at the following circuit problem which involves linear algebra, since I am not a physics major, I don't even have the basics to get started. Please shed some light, really appreciate it! Thanks a lot. 1. Homework Statement Consider a long chain of resistors wired up like this...

Can anyone explain to me what my professor did? I am able to get the same answer, but not without a page of nodal analysis. It seems quite elegant and none of my friends know what method she used. Thanks!

Homework Statement Question is attached below Homework Equations v(t) =v(infinity) + [v(t0)-v(infinity)]e^[-(t-t0)] The Attempt at a Solution For t<0, you get the circuit where it is only Rt, R, and C, but in dc circuits, the capacitor is an open circuit, does this mean v(t0) =0? For t>0 the...

This is a problem from Foundations of Analog and Digital Electronic Circuits by Agarwal & Lang, I'm going through it by myself, I'm not in a course, so I'm depending on you friendly forum people for help! I really like this book but it has a lot of errors, perhaps this is another error. 1...

Homework Statement When an initially charged capacitor is connected in a circuit with an uncharged capacitor, why would the total energy of both capacitors be less than the initial energy of the charged capacitor? Homework Equations This was a question asking for an explanation, so I'm not...

This query comes from not being able to answer some one else's query :oops: it show's I have been away from textbooks and classrooms way too long ( see my signature ) I have forgotten my basics These RL circuits Now I realize A and B are just the same with the RL rotated and following that...

Homework Statement Solve for final Vout. Homework Equations Circuits The Attempt at a Solution So 1 and 2 are easy. I'm just going to skip to where I get confused. There is a 50k resistor between where I solved for Vout after the 2nd Op Amp. I found the voltage to be 12V. Now the solutions...

I am struggling with doing calculations for a physics lab report. I understand how to calculate the equivalent resistance and the voltage of the battery. I am struggling with calculating the resistance of each resistor and the current of each resistor. I am sorry but I am getting very...

they have different names or something else?

It is possible to use a capacitor/inductor in an op-amp to allow it to perform the mathematical function of differentiating or integrating an input signal. It is also possible to do this without an op-amp, using simply resistors, inductors and/or capacitors. So what are the advantages of using...

I'm studying for my prelim and am trying to understand inductance better based on some questions I have done I've come up with these statements can anyone confirm they are true the back emf in an inductive circuit at any given time equal to the voltage across the inductor I initially thought...

A d.c circuit consists of a switch, lamp and inductor. The inductor is replaced with an inductor with twice the number of turns in the coil of wire, nothing else about it is changed. State the effect on A) maximum current B) the time to reach max current I thought increasing the turns would...

Why do we use the square of the graph as opposed to the absolute value of the graph to find the mean values?

Hi guys, Sorry if all you guys think this question is too easy. But I have a hard time to understand how to group the resistor. I suppose to find the the thevenin and Norton equivalent circuit. This is what i think about the combination of resistor. Req1= RL+1k Req2= Req1 ll 3.3k (3.3k after...

Homework Statement Homework Equations P = V^2 / R 1/Rt = sum(1/Ri) (parallel) The Attempt at a Solution [/B] Since all the answer choices express the solution in terms of V^2 / R, I tried to find the voltage drop across resistor #2 to find the power. I collapsed the two parallel...

Z(A,B,C,D) = SUM-M(1,2,4,7,8,11,13,14) Draw circuit of Z with lowest number of 2 inputs xor-gates. Can i have a clue? I tried drawing k map and had too many terms.

I am taking an intro electrical circuits course which requires that I write extensive lab reports. I just completed a really simple lab about calculating resistance when configured in series and parallel, etc. In my intro I'm writing a short explanation about resistance, and resistors, and...

Homework Statement I hope you can see the picture clearly. Someone drew lines over it,so please try to ignore that. The problem here is to determine the current of ideal current source Ig, if following parameters are known: -E1=50V, E3=30V -R1=200Ω, R2=500Ω, R3=3kΩ, R4= 10 kΩ -C=0.7 μF...

Homework Statement Find the equivalent resistance Rab for each circuit given here (resistance values have been omitted so I can focus on understanding the concept, but I can supply them if requested). Homework Equations This problem expects me to know how to combine resistors in...

Homework Statement [/B] Find the potential difference between points b and a in the circuit below I have already solved for the voltages of the two batteries (1 and 2) in the circuit (18 V and 7 V respectively) 2. Homework Equations Kirchhoff's Rules 1) Potential difference across any...

Homework Statement This problem apparently has a simple solution if you are good with circuit theorems but no matter what i try or how i combine them, it's just impossible. Given a circuit on the picture, and circuit parameters E3=12V,R1=1kΩ,R2=30Ω,R3=150Ω,R6=200Ω, if it is known that current...

may i know what is snubber circuit?? and what is the different between having snubber circuit vs without subbers circuit..

Homework Statement It can be shown that a square wave can be represented by a sum of sine waves as given by the formula below v = v0sinωot + v1sinω1t + v2sinω2t + v3sinω3t +... Solar cells have an output that is dc. The pd across a cell depends on the incident radiation and the efficiency of...

So, recently I started learning about electronic components and then I started learning about semiconductors. The one which I've been having some real trouble to understand its function is the transistor. So I bought an electronics textbook called El ABC de La Electrónica (The ABC of Electronics...

Hello, this is a maths problem that is related to a physics problem, but I think it's best posted here due to what I'm asking about. 1. Homework Statement \frac{d^{2}q}{dt^{2}} + \frac{R}{L} \frac{dq}{dt} + \frac{1}{LC}q = 0 is a differential equation describing how charge and current change...

Hi all, I have a question about voltage drop of a battery. I understand Kirchoff's laws well, but it occurred to me that I did not understand intuitively why the "zero volts" at the end leg of a series circuit would still produce current. Theoretically you could have the majority of a series...

Homework Statement I am supposed to determine the potential differences between the points. However, I thought circuits had to be closed...

Mentor note: Member warned about posting a question without the template 1. Find the electrical potential between A and B given that R1=R2=R4=100 Ohms; Power dissipated by R3 is 200 mW at 9 Volts [ code ] A---------R1-----------*------------------- | |...

Homework Statement So this is not really a 'solve this problem' question, but, rather, I am trying to understand how they can call ABCDEFA a 'closed loop' even though there is another connection (BE) inside it, and why the equations work. Keeping in mind that I am still in high school...

Homework Statement For the balanced three-phase loads shown in FIGURE 3, ZY = (15 + j15) Ω and ZΔ = (45 + j45) Ω. Determine: Uploaded file C1.png (a) the equivalent single Δ-connected load, (b) the equivalent single Y-connected load obtained from the Δ-Y transformation of (a) above, (c) the...

Homework Statement Homework Equations 3. The Attempt at a Solution Z11 8 + 6 Z12 6 Z21 6 Z22 6 V1 = Z11 I1 + Z12 I2 V2 = Z21 I1 + Z22 I2

Well, recently I have started to deal with electronics and I've seen several new concepts such as ohm's law, parallel and series circuits, what's AC and DC and many other topics. Ok, I have no doubt on what's direct and alternate current or what a series and parallel circuits are; rather than...

Homework Statement Hi, I already asked a question close to this, but now I have different conditions. This is the circuit C_1 = C_2 \\ R_1= R_2 The current is an AC , and I would like to know the voltage at R_1 and at R_2 I made some progress but I do not really know hot to continue...

Homework Statement See pic for problem statement and diagram (we are dealing with the diagram on the right) http://i.imgur.com/Uv7Ikma.png I'll rewrite the problem statement here if that helps: Find R_T in the diagram for the cases where ab is open circuited and short circuited. And its...

In the given figures , what does the arrows denote , I mean what direction ?? VnR is upward in 1st fig. , VnR is towards left in 2nd fig. ( n is neutral here ) while in 3rd the line voltages are in anti-clockwise direction..! I wanted to know the pupose of this and why these directions only??

Apart from single phase circuits , we use two phase , 3 phase mostly .. but I want to know what actually we mean by 2 phase , 3 phase circuits..! I know in single phase supply , there is one voltage , one current .. 3 phase has 3 currents and voltages.! What is the purpose for these polyphase...

Homework Statement I need to find I1,I2,I3,Va,Vb but i don't even know to read the circuit. i know how to to do series circuits and parallel circuits but not this. How do i read this circuit and know which ones are in parallel or in series. is there a way to re-draw it? I have the solution...