Circuits Definition and 1000 Threads

I'm having an unpleasant time studying circuits. I feel like they are much harder than the rest of Electromagnetic concepts in Calculus-based Physics II. I can understand Gauss' law and other concepts but circuits make my stomach cringe. It is the type of thing that begs the "do this and this...

Homework Statement You need to modify a simple charging RC circuit (power supply, resistor, and capacitor in series) to maintain the same maximum current but lower the the time constant and make it charge faster. Which of the following will accomplish it? A) Same R, lower C. B) Same R...

Ok so I have some topic overview questions. I think I am on the right track but would like to make sure I am thinking about this the correct way. When I say time variant I simply mean there is a simple switch in the circuit. This is link to a were I found my supplemental material and it has...

Hello, Is there any way that I can detect a certain time in the day, and apply a signal HIGH for 30 minutes? The only way I can think of how to do it is via a frequency divider that sends a pulse for 30 minutes, but that requires >30 Flip Flops as we are working with 27MHz clock frequency.

Homework Statement The total energy stored in an LC circuit is 2J. The inductance is 10^-2 H and the capacitance is 100 μF. What is the time interval between a maximum current through the inductor and a maximum potential difference in the capacitor?Homework Equations T = 2∏/ω ω = √(1/LC)The...

Homework Statement http://img828.imageshack.us/img828/1149/70833278.jpg Now this is a part of the solution that was given I was having difficulty understanding. The Attempt at a Solution i(0) = 0 - understood u(t -1) for 0 < t < 1 = 0 I can understand why the voltage from...

Homework Statement A E = 12.0V battery with an internal resistance r = 1.80Ohm is connected to two 8.80kilo-Ohm resistors in series. An ammeter of internal resistance 0.410Ohm measures the current exiting the battery and at the same time a voltmeter with internal resistance 17.7kilo-Ohm...

First off, I'm looking at adding in a few LED's into my iPhone 4s (I'm very limited on space, but there is a pretty open area.) I have found a connection point that gives off 2.8v and is commonly used for lighting up LED's with the screen. I plan to add in a red, green and blue 0603 (or even...

Homework Statement I'm having trouble understanding how RL circuits work. Here's my understanding so far. Let me know where I'm going wrong. I've provided a reference image. Right after the switch is closed, the current through R1 and R2 is zero. The potential difference for these two...

The problem statement 7. In the circuit below, the resistor R3 models a light bulb. a) Use superposition to find iX. b) Find the Norton equivalent as seen by the independent current source, iS2. c) Find the power delivered by the independent current source, iS2, in the circuit below. Diagram...

Homework Statement Hey guys, Can someone please explain how the following circuits that I attached are equivalent? I'm not seeing that they are when I develop equations for the output Z. For the first one I get Z=Q1+Q2=(Q1'+Q2')+(XQ2')'=Q1'+Q2'+X'+Q2 For the second image I get...

Homework Statement Let's say i have a circuit with two resistors connected in parallel with some source. Then another resistor is added in parallel with the first two so what happen to the current in the battery? Homework Equations The Attempt at a Solution Should the current in...

Homework Statement 1. Is it necessary to discharge the capacitors before starting the experiment in series? Why? 2. Is it necessary to discharge before starting the experiment in parallel? Why? The attempt at a solution For the first one, we connected 3 capacitors in series, and the...

C1 has capacitance of 0.05 μF C2 has capacitance of 0.1 μF C1 fully charged, connected to a 0.4 V battery C2 left uncharged. C1 was disconnected from the battery and two parts joined, allowing the charge to transfer from C1 to C2. Q: Calculate the percentage of charge transferred...

Hello everyone. I'm trying to do a homework in digital integrated electronics class and feel like I can finish it only if I had a good set of notes. I have problems like comparing the input capacitance of a Mosfet to a wire of certain length, getting RC time loss in a wire, power...

Need to Build Two Circuits That "Sense" Proximity To Eachother Hi all, I am trying to build two circuits as part of an experiment that can "sense" proximity to one another. So basically, as they the two circuits get physically closer to each other (starting at a range of maybe 10-20ft), an...

Say a circuit has a 9V DC supply, a 2 ohm resistor in series with it and also a parallel combination of two 1 ohm resistors in series with it. So a simple series-parallel circuit. What I don't understand is why the voltage drop across the 2 ohm resistor isn't 6V and the voltage drop across both...

Homework Statement A circuit includes a spark gap that connects to the ground. The width of the gap is adjusted so that the capacitor discharges to the ground each time the voltage reaches 99% of the maximum. (The circuit is basically a simple series circuit with an 80v power supply...

This is probably an extremely awful question to pose at this point, but I feel lost. I'm in my Junior year at 4 year uni after transferring from 2yr college and the jump seems so huge. One of things that is giving me headaches a lot this semester is learning how to design with extremely little...

Homework Statement This was a question on my lecture slides which I didn't quite understand during the lecture. Here is the circuit: http://img843.imageshack.us/img843/3548/nodesbranchesloops.jpg The question was to find independent loops in the circuit. On the left-hand side I drew in the...

hi there..in some places, i saw the usage "the Q factor of parallel LC tank ckt" while in some others, the Q factor of the inductor used in tank ckt is given..are they same?? As far as i know,Q=wL/R is the thing for inductor ,where R is inductor's series resistance..is the formula same for the...

Homework Statement Three resistors are connected across a battery as shown in the figure. (Let V = 141 V and R1 = R2 = R3 = 204 Ω.) http://www.webassign.net/bauerphys1/25-p-057-alt.gif (a) How much power is dissipated across the three resistors? P1 = P2 = P3 = Homework...

Since they are closed systems, and do not contain water, why do they use a dryer? And how does that dryer works? It uses a dissecant? If so does it need to be changed?

Homework Statement Hello guys. I've ran into this conceptual problem. I was given into physic's lab to prove Ohm's law by mounting a circuit in two ways, and calculate both Voltage and Intensity. The first circuit, the A (Please refer to Circuit A.jpg), has the inconvenient in which the...

Homework Statement In a problem I have a circuit that I have not set up to know what happens as far as voltages across my battery(4v), two equal resistors and a capacitor. Homework Equations The Attempt at a Solution Because i have not seen a circuit like this I am thinking that...

Homework Statement Two parallel plate capacitors, 6 microfarads each, are connected in parallel to a 10V battery. One of the capacitors is then squeezed so that its plate separation is 50% of its initial value. Because of the squeezing, (A) how much additional charge is transferred to the...

equivalent resistance of tricky circuits? Homework Statement what is the equivalent resistance between A and B? Homework Equations kirchoffs law for voltage and current The Attempt at a Solution i got the equivalent resistance between A to C as 3R/4 but i have to find the...

How do you implement different gates by using a two-input multiplexer? What are the inputs supposed to be? How do you implement an AND gate, for example? An OR?

I have (conceptual) questions about this question posted before: https://www.physicsforums.com/showthread.php?t=386071 On the second part of the question (part B: The switch is opened at t = 0s. At what time has the charge on the capacitor decreased to 12% of its initial value?), why does...

I need to decide whether to take analog circuits of digital circuits. I can always take the other one later. But for now, it's a tough call. I am very into computing and its applications, and I love logic; it seems like digital is the way to go for that stuff. However, I am also very...

Homework Statement The circuit has identical bulbs and an ideal battery. When bulb D is unscrewed from its socket (the socket remains in its place), what would happen to the brightness of bulb F? Homework Equations V = IR The Attempt at a Solution Since bulb D is unscrewed from it...

Theoretic question: is there a way to know if it is no possible to write impedance/admitance matrix (depend on which method we want - volage or currents) just from the circuite connections? Thanks!

Homework Statement I need to find the thevinin equivalent for points AB. The Attempt at a Solution I know the Is current is splitting equally between R1 and R3, but doesn't go to R2 because of the dependent current source. so i thought that through: I(R5) = Is and I(R3)=Is/2 so the...

Homework Statement 1. How do you expect the frequency generator output voltage to change with increasing load (decreasing impedance)? 2. Explain the meaning of component tolerance. (E.g. Tolerance of a resistor) 3. Is a real inductor completely reactive? Why Homework Equations...

Why is it that in a series circuit the sum of the voltages across the components is equal to the voltage supplied by the battery but in parallel the voltages are equal for different branches in the circuit?

Not sure If I posted this is the correct place -Im new ---- hi, I am working on a college assignment. I'm on a day release program and unfortunately I missed the day where we covered this part. Please could someone help me? The questions I need to answer are: a) For each capacitor...

Not sure If I posted this is the correct place -Im new ---- hi, I am working on a college assignment. I'm on a day release program and unfortunately I missed the day where we covered this part. Please could someone help me?The questions I need to answer are: a) For each capacitor shown in...

Homework Statement In the arrangement shown in the figure below, a potential difference DeltaV is applied, and C1 is adjusted so that the voltmeter between points b and d reads zero. http://capa.physics.mcmaster.ca/figures/sb/Graph26/sb-pic2667.png This "balance" occurs when C1 = 3.56 µF. If...

SOLVED. Just making the post showed me the answer. Sorry!

http://capa.physics.mcmaster.ca/figures/sb/Graph26/sb-pic2654.png This is more of a concept understanding if anything but I'm interested to know why the charge on capacitors A and B are the same and similarly, the charge on capacitor C and D are equivalent.

Homework Statement C1 = 1μC ; C2 = 2μC ; C3 = 3μC ; C4 = 4μC V = 12.0V If both switches are closed, what is the charge on C1? Homework Equations q = CV In parallel - V is constant across capacitors Cxy = Cx + Cy In series - q is constant across capacitors Cxy-1 = Cx-1 + Cy-1The Attempt...

Hi, I've been busy in designing some circuits and I want to simulate some non linear behavior of transistors and diode circuits. I want to find a free simulation program. Does LT Spice work on these discrete components? Thanks Alan

I'm working on an ac circuit, and we were told to use nodal analysis. Furthermore, we are asked to show a power balance between the sources and the power dissipated in the resistors, along with a reactive power balance between the sources and the inductors and capacitors. I have this formula...

A series RLC circuit is connected to a 5 V supply, the frequency of the supply is adjusted to give a maximum current of 11.9 mA at 2.5 kHz. The Q factor is 70. Determine the component values of the circuit. R= 5/.0119=420.2 Ohm Q = (1/R)*(sqrt L/C) 70 = (1/420.2)*(sqrt L/C) 70/(1/420.2)=...

For the circuit given in the power factor is 0.72 lagging and the power dissipated is 375 W. Determine the: (1) apparent power (2) reactive power (3) the magnitude of the current flowing in the circuit (4) the value of the impedance Z and state whether circuit is inductive or...

When simplifying a circuit, can a parallel branch with a current source and a resistor in series be considered as just the current source? Also, if two parallel current sources 'point upwards' i.e. toward the positive rail, can I add them together as one source even if there are other...

Homework Statement R1-10 R2-13 r3-3 R4-6 What should be the total voltage so that I3 = 1A. Homework Equations n/aThe Attempt at a Solution idk to solve it help me plss :(

Homework Statement I just need help on a simple question, In a parallel circuit with 3 bulbs, if one bulb is removed, will the intensity of the other 2 bulbs remain the same or increase? thanks much!

Determine the required value of the shunt resistance if the maximum value of the current I is 200 A. The meter can read a maximum of 1 mA and has a resistance of 0.1 Ω. My answer is; Rsh: 0.1*(0.1x10^-3)/200-(0.1x10^_3) =0.1/(200/0.1x10^-3)-1 =1/19999990 =0.0000005 ohms Is...

Homework Statement What causes integration of V_{in} within an RC circuit?Homework Equations Z= R + X_C = R - j/(ωC) Z is the impedance of the circuit, j=(-1)^.5, ω is angular frequency, and C is the capacitance. The Attempt at a Solution I think integration is the capacitor's way of...