What is Circuits: Definition and 1000 Discussions

Formula One, abbreviated to F1, is currently the highest class of open-wheeled auto racing defined by the Fédération Internationale de l'Automobile (FIA), motorsport's world governing body. The "formula" in the name refers to a set of rules to which all participants and vehicles must conform. The F1 World Championship season consists of a series of races, known as Grands Prix, usually held on purpose-built circuits, and in a few cases on closed city streets. The results of each race are combined to determine two annual championships, one for drivers (World Drivers' Championship), and one for constructors (World Constructors' Championship).This list is for the circuits that hosted World Championship races from 1950 until now. The terms "Formula One race" and "World Championship race" were not always synonymous throughout history – see Formula One#Distinction between Formula One and World Championship races for a detailed explanation.

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  1. S

    How much circuits knowledge is required for device physics?

    Hey everyone, I'm graduating with my bachelor degree in physics soon and intend to study physical electronics and device/semiconductor physics in graduate school. I've taken the standard undergrad physics curriculum (quantum mech, stat mech, electromagnetism, circuits, experimental physics) with...
  2. G

    Circuits Question Node Voltage Method

    Homework Statement I'm having problems finding the power. I should my work to get the node voltages. Apparently they are correct. I showed how I got to those answers as well just in case they were wrong but I don't think they are. http://img547.imageshack.us/img547/8812/capturebu.png...
  3. C

    RC circuits - questions about the solution

    RC circuits -- questions about the solution Homework Statement First of all , greetings from Peru and thank you to all the people who help another people here,taht's awesome , please help me with this guys... Here's the statement The solution is My questions: ok my question is about the...
  4. V

    Converting input in rlc circuits

    I was wondering how to convert E=70.7sinwt..<-- (just an example) to something like 50∠0 degrees?
  5. U

    Unraveling the Mystery of RL Circuits: High Pass and Low Pass

    Homework Statement Hey guys, I've recently completed a module on circuit theory and I came across this particular slide on RL circuits (High Pass Filter) which puzzles me: High Pass: RL Circuit, Low Pass: RC Circuit The phase is given by: tan ψ = (ωL/R) but the very next line...
  6. A

    How to Determine Inductance in RL Circuits for a Required Current Response Time?

    Homework Statement An inductor is connected in series with a 1000 ohm resistor and a battery. What mus be the inductance in millihenries of the inductor if the current in the circuit is required to reach 90% of its final value after 20 microseconds? Homework Equations I am not actually...
  7. T

    What is bandwidth in the context of RLC circuits?

    Homework Statement I noticed that bandwidth is the difference between the frequencies that gives half power: But sometimes it is the difference between when the frequency is 0 and the frequency that gives half power: So the definition in my lecture slides states that bandwidth is the...
  8. B

    Do circuits have complexity classes?

    In the field of computer science, algorithms are often assigned a "complexity" class that is a measure of the time complexity of an algorithm. An algorithm with higher time complexity can take longer to compute than one with less time complexity. I was wondering if circuits also have a...
  9. W

    AC Circuits Terminology: Phase shift vs Phase Angle

    We talked about AC circuits and phase shifts were discussed. Voltage changes "lag behind" current changes so that's how we get phase shifts. It's like a sinusoid so fine. Then we talked about impedance. There's a real and "imaginary" component to impedance, graphed on x-axis and y-axis...
  10. J

    MATLAB Troubleshooting MATLAB Simulink Circuits for Sinusoidal Wave

    Hey guys. I am trying to simulate some circuits in MATLAB's Simulink, and I always get some weird graph which is not sinusoidal at all. I wanted to know if anyone could tell me which block am I missing if I want to get a good sinusoidal wave. Here are the pictures of the circuit and the...
  11. 9

    Question regarding electric circuits and current

    Homework Statement Referring to the electric circuit above, when the switch(S) turn on, the brightness bulb Q and Ammeter reading increases. so my question is, why? is it true that the S create another path way for current, then at the end of S, the electric current joins the electric...
  12. A

    Wrong answers to problems in Introduction to Electric Circuits, 8th Ed

    Wrong answers to problems in "Introduction to Electric Circuits, 8th Ed" I'm studying electric circuit analysis on my own using "Introduction to Electric Circuits, 8th Ed, International Student Version" by Dorf and Svoboda (ISBN 978-0-470-55302-2 to avoid any confusion) and it seems like every...
  13. B

    Compound Circuits and resistance in a parallel circuit

    Homework Statement http://imageshack.us/a/img829/1351/circuite.png Find the current through R3 and R2. The resistance of R2 and R3 are 3.00 Ω, so the total resistance should be 9.00 Ω. I = 80.0 V / 9.00 Ω = 8.89 A Homework Equations I = E/R (I think?) The Attempt at a...
  14. A

    KVL in AC Circuits: Exploring Accuracy

    Hello, Why do we use KVL in Ac circuits ?! or to be more specific is it accurate to use it in Ac circuit , just the same accuracy as using it in Dc ?! Doesn't the current that pass through the circuit itself make it's own variable magnetic field , which crosses the loop of the circle ...
  15. J

    Simplifying Complex Resistor Circuits

    Simplifying "Complex" Resistor Circuits Homework Statement Question 1: I have an E&M test coming up and I'm having trouble simplifying complex circuits. Our teacher told us something about "pinching" the wires which I didn't really understand. I found the following link...
  16. T

    Time constant in RC AC and RL AC Circuits?

    Homework Statement I know that in a RC DC circuit the time constant is R*C. But what about a RC AC circuit, is it the same time constant? Same goes with RL AC circuit, is the time constant R/L? Thanks!
  17. M

    RC circuits - Current and electric potential

    Homework Statement Given the drawing, calculate the current going through the 2Ω Resistor and then calculate the difference in electric potential from point a to b. Homework Equations V = IR juction rule: ƩI = 0 = Iin - Iout ƩV = 0 The Attempt at a Solution Well, I attempted to draw all the...
  18. J

    Engineering How Do Voltage Polarity and Thevenin's Theorem Affect Circuit Measurements?

    I would really appreciate if someone could clear this up for me. Basically, with the first one (link below), we are told to set the source (Vs) to 6v and then measure the voltage across each resistor. It however says in the question to make sure the polarities of the measured quantities are...
  19. M

    Help concering understanding Circuits (Linear Algebra Related)

    In our Linear Algebra class we barely touched on (and I mean barely touched up on) circuits. Thing is, it will be on the exam, but just 1 question. My problem is understanding how to get the formula to use Cramer's Rule Of course I know how to set these up into Matrices and do all of...
  20. J

    Mutual Inductance of Two RC Circuits?

    Homework Statement In the circuit shown in the following figure(Figure 1) the capacitor has capacitance 20 microF and is initially uncharged. The resistor R_0 has resistance 12 Ohms . An emf of 90.0V is added in series with the capacitor and the resistor. The emf is placed between the...
  21. M

    How Can You Alter the Voltage Across a Buzzer to Interrupt a 'Safe Circuit'?

    Homework Statement I actually have posted this question in another part of this forum, but due to lack of responses, I felt maybe I posted it in the wrong section. Can you all take a looksie please? https://www.physicsforums.com/showthread.php?t=645676
  22. I

    Engineering Circuit Analysis of driven RC Circuit with short circuits

    Homework Statement Determine the value of the current labeled i and the voltage labeled v at t=0+, t= 1.5 ms, and t = 3.0 ms. Homework Equations Ohm's law: v = i *r Decay in source free RC Circuit v(t) = v@0 * e^(-t/RC) The Attempt at a Solution i(0-) = 0.1 A. Therefore, v across 200 ohm =...
  23. P

    Mesh analysis in non-planar circuits

    How to solve non planar circuits using mesh analysis? Is it possible or not?
  24. G

    Circuits Question - Voltage and current in an inductor circuit

    Circuits Question -- Voltage and current in an inductor circuit Homework Statement See Attached Homework Equations The Attempt at a Solution I found Zeq and there are exactly 2 Amps going into it. I'm not sure what to do from here. Z_{eq} = \frac{<(arctan(\frac{R}{ωL}))}{ω^{2}L^{2}+R^{2}}...
  25. C

    Engineering Simplifying Complex Resistor Circuits

    Homework Statement See attached image. Homework Equations The Attempt at a Solution I cannot find any resistors in parallel or series in the circuit. I am confused by the lone branch going from the 10kOhm resistor back to the other end of the same resistor. How do I deal with...
  26. L

    Engineering Circuit Help: Solving for R1 Current in Parallel Circuit - 4.06A Total Current

    I already got the total current that I did doing the Delta / star . what I got is 4.06 for total current, now is asking me to get the current of R1 , I know I have to get the voltage in order to get the current that is I = V/R but I don't have any idea how to get the voltage when is parallel I...
  27. Z

    Engineering Inductor Voltage Maximum and Maximum Voltage Calculation

    Homework Statement The current in a 25mH inductor is known to be - 10A for t <= 0 and (-10cos400t - 5sin400t)e^-200t A for t >= 0. Assume the passive sign convention. Part A: At what instant of time is the voltage across the inductor maximum? Part B: What is the maximum voltage...
  28. elementHTTP

    How to generate less heat in circuits ?

    How to generate less heat from 12v source whit regulated output of 5v which draws 3A lm350 ? LT123A ? pwm ?...etc Is there any way (technic ) to avoid so much waste heat (Q≈I^2 * R ) and not to require heat-sink ? thanks :D
  29. elementHTTP

    Protecting electronic circuits in hazardous areas ?

    I am interested in how to protect electronics circuit in hazard areas Are there special ways of soldering /circuit arranging for highly vibrational places ? moist/water protection ? Impact ? Hi temperature ? Special box materials for examples above? etc... tnx ;D
  30. J

    Engineering Circuits: reactive,active, and power factor

    I found total impedance to be 14.23 ohms with an angle of 20.15. Found power factor to be .938 Pretty much stuck at a dead end trying part 2 and 3.
  31. G

    Solving Circuit Questions: Finding Vth and Currents

    Homework Statement See attached Homework Equations The Attempt at a Solution I found Vth (V1 - V2)/2 + V1/10 + 2 = 0 (V2-6)/4 + (V2-4)/6 + (V2 - V1)/2 = 0 Solving for V1 I get -5/2 and V2 I get 1 V1 = Vth = -5/2 I believe this is correct. It's just if these two...
  32. S

    Finding the current for each time interval (Electric circuits)

    Homework Statement The problem and its solution are attached as TheProblemAndSolution.jpg. 2. Relevant equation ν = L di/dt The Attempt at a Solution I don't understand how the solution gets i = 10.0 A for t = 2 ms as well as to how it gets i = 30 – (10 * 10^3) t) (A) for 2 ms < t < 4...
  33. S

    Looking for problems with AC circuits

    Hi! I was wondering if there are any guides with problems and exercises relating AC circuits (capacitors and inductors), circuits with phasors and real, reactive, and apparent powers. I do not need the answers, I just need a selection of exercises to study from there.
  34. FOIWATER

    RLC Series Circuit Analysis: Questions and Answers

    Just a quick question for you people - If I have a linear RLC series circuit where there is an uncharged capacitor at time t=0, and the switch is closed, is it an entirely different analysis (in terms of laplace transforms) than If, say, the some battery charges a capacitor, then I put it into...
  35. K

    Calculating Voltage Gain for Electrical Circuits

    Homework Statement I've been reviewing my electrical theory and I'm having trouble trying to calculate an expression for the voltage gain for these two specific circuits. (Images c and d of the question.png attachment). I already know the answers, however I am unable to derive the same...
  36. D

    RC Circuits Voltage: Solving for V(out) with Loop Rule

    Homework Statement Relevant infor V(out) stands for the voltage divider I believe The Attempt at a Solution I am just going to get the equation first. For the first part, applying the loop rule I got 12 - 10^5q' - 10^7 q = 0 with q(0) = 0. Solving I get Q =...
  37. L

    Does this obey passive sign convention? (Circuits)

    I thought passive sign convention is obeyed when you have a positive current flowing into the positive terminal of the element first. But how about this case? While it is drawn that way, the positive terminal is actually the NEGATIVE terminal because the voltage is negative, so you have to flip...
  38. I

    Engineering Circuits analysis with independent current source

    Homework Statement https://www.edx.org/static/content-mit-6002x/images/circuits/H1P2.79e52b492b94.png Homework Equations It's been a while since I've done KCL/KVL, could be that I'm being just being stupid. I'm trying to find v1, i4, and the power in all the circuit elements...
  39. F

    Find the currents i1 and i2 in the circuits

    Find the currents i1 and i2 in the circuits ,see fig. v = iR ohms law -1.5 + i1 + i2 = 0 kirchhoffs law What should i do to find i1 ? http://s716.photobucket.com/albums/ww168/Pitoraq/?action=view&current=DSC_0202.jpg
  40. Y

    AC Circuits question verification

    Hi there, in this youtube tutorial about AC circuits http://www.youtube.com/watch?v=JiLdrAHBBRc&feature=plcp at about 4:08 It's supposed to be z=√(R^2+(XL-Xc)^2)) but in the example she does Xc-XL, is there a reason for this or is it a mistake in her working??
  41. G

    Electromagnetics Question Circuits

    Homework Statement If V_{s}(t) = 12 sin(4*10^{4}t-\frac{∏}{4}), R = 2 Ω, L = .1 mH and C = .3 mF, obtain an expression for the current though the capacitor. See attached file for circuit. I'm really confused. I applied KVL around the loop with the coil and got that \tilde{I} =...
  42. A

    What is the use of converting a circuit into its dual?

    I just do not understand this concept. My book doesn't explain it clearly nor do I find anything useful on Wikipedia. So what is it used for? I know the steps to convert - like changing voltage source to current source, resistor to conductor etc. But why am I doing it? What is the use?
  43. T

    AC Circuits: Voltage Changes and Neutral Becoming Live?

    I was just reviewing AC circuits and the diagram shows that the voltage changes in AC, it goes up and down and on the diagram is shows the current goes one way then the other. But in AC, does the neutral become live? I thought the red was always the live wire! but according to the diagram...
  44. D

    Kirchoff's circuits and the Electric Field

    Homework Statement I have drawn the direction of the electric field in the picture. I saw this on a video on youtube where this guy solves circuit problems solely on looking at the direction of the electric field. Basically he follows the current and the electric field...
  45. P

    Can a Bleed Line Improve Air Removal in Hydraulic Circuits?

    Hey all, I never studied hydraulic circuits but I needed to design/make a hydraulic system for some research equipment. The system (in the attached schematic) has been hooked up and used for 6 months or so. However, I think we went the hard way on with getting the air out (we had no idea...
  46. C

    Potential difference on complex circuits

    ****WARNING-THIS IS NOT A HOMEWORK-WARNING**** Hello dear Physics Forums users, I have no idea about how to find the potential difference between two points in a complex circuit. I m not even sure if I really know how to find it in a basic circuit. Please help me and enlighten me with your...
  47. R

    Do circuits built using PCB and using bread board perform the same?

    I want to build a EEG and the site tells me to buy a PCB from some manufacturer. Will my product have competent performance if built with breadboard? What is so special about PCB？
  48. I

    Formula for ripple factor in filter circuits

    i have come across two different formulas for ripple factor: One is r= (Vrpp/Vdc), where Vdc is the dc voltage of the output and Vrpp is the peak to peak ripple voltage. My professor uses this formula and I have also seen it being used in basic electronics by Floyd Another one is r= Vrms/Vdc...
  49. A

    Solving Circuits with R, I, V.

    Homework Statement Linked below is a rough picture of the circuit for which I need to find the currents. https://docs.google.com/drawings/pub?id=1jY6r1yjOf9OG5VixjZKcQbG2rj-ZQ7LZzaybGzkjva0&w=960&h=720 Homework Equations Kichhoff's Laws, Ohm's Law. The Attempt at a Solution...
  50. T

    TTL Gate Circuits: Unconnected Inputs Logic Level HIGH?

    Why do TTL integrated circuits assume unconnected inputs to be at logic level HIGH? Does the answer lie in the circuitry itself or some other factor?
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