Rc Definition and 632 Threads

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...

I can't figure out the differential equation made in RC circuits During charging E = iR + q/C ...I understand this During discharging my book says that since E = 0 , iR + q/C = 0 and by using i = dq/dt it solves the equation But using kirchhoffs law i end up with the equation q/C - iR = 0...

Hello, my question this time is once again about parallel resonance. I can't really decipher this paragraph from my text: '...the resistances of a parallel circuit are of signal importance in determining the frequency of resonance, even to the extent of making resonance either possible or...

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...

I have a circuit I need to find a voltage on. Is there a way to figure it out on the provided picture in here? Thanks

Hi everyone, I know this should be obvious, but there's something I am just NOT getting. Imagine a simple series RC circuit with a DC source as shown in the attachment. As can be seen from the picture, I have solved the differential equation in capacitor current in the time domain. In...

Homework Statement A 5 micro farad capacitor is in series with a resistor, a switch, and a 12VDC ideal battery. The switch is closed at t=0s. The time constant of the circuit is 4.0s. Determine the value of the resistance R? Homework Equations The Attempt at a Solution From another...

Parallel RC circuit (Updated) I'm having trouble with a seemingly simple circuit. I have a voltage source (not alternating current) that increases exactly with time. In other words, if you graphed voltage as a function of time, the slope would be 1. The voltage equation is v(t)=t. The capacitor...

In lab, we built a circuit with a 4.7 micro-F capacitor hooked up to a DC source. In parallel to the capacitor was a 10megaOhm resistance voltmeter. We used the voltmeter to find the voltage drop across the resistor and find the RC constant (supposing unknown C). We would turn on the battery...

Homework Statement Given this diagram: Picture mirror: http://i.minus.com/1331507225/3XjEXOAlTaoJBoBuQFoJiQ/itFBvAiitDZQc.png With S1 switch closed and S2 switch left open, I am trying to find the time constant Homework Equations I know τ = RC for a basic circuit, but how...

1. Homework Statement The capacitor in an RC circuit with a time constant of 25 ms is charged to 10 V. The capacitor begins to discharge at t = 0 s 2. Homework Equations τ=RC ΔVC=(ΔVC)e^-t/τ 3. The Attempt at a Solution part a) At what time will the charge on the capacitor be...

Homework Statement The capacitor is initially uncharged when the switch is closed for a long time. Calculate the current through R2. Then find the potential difference across R1, R2, and R3Homework Equations V=IR Iin=IoutThe Attempt at a Solution I first set up current going into top node (I1)...

Homework Statement The diagram below depicts an RC-circuit where C = 1.70 μF, R1 = 18.0 Ω, R2 = 10.0 Ω, and V0 = 2.0 V. a.) What is the current through R1 immediately after the switch S is closed? b.) What is the current through R2 after the switch S has been closed for a very long time...

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...

Homework Statement The circuit used in this problem is attached as an image. I made this in gEDA (the circuit is from the homework problem, I just didn't feel like using a scanner to get the image) The 2-microfarad capacitor shown in the circuit attached is fully charged by closing switch...

Homework Statement A circuit is constructed with four resistors, one capacitor, one battery and a switch as shown. The values for the resistors are: R1 = R2 = 49 Ω, R3 = 64 Ω and R4 = 64 Ω. The capacitance is C = 88 μF and the battery voltage is V = 24 V. The switch has been open for a...

Homework Statement Find Vn in the attached ckt. Homework Equations The Attempt at a Solution C12 & C2G act as capacitive voltage dividers. But I don't know how to account for R in parallel with C2G.

Homework Statement Given a circuit with two resistors, R and r, and a capacitor of C, and EMF of V0 as shown in the diagram, find the voltage across the capacitor during charging. Prove that this voltage, V is given by V = V0 (r/(R+r)) (1-e-((R+r)t)/(RrC)) Homework Equations N.A...

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...

Hello. I maybe should have put this in the maths section, but it is related to electronics, so I figured here. I am reading Microwave Engineering by Pozar, and in one of the examples, it says that the series RC load impedance is ZL = 60 - j80, so the resistance is 60 Ohms and the...

For the attached rc circuit, at time 0, the switch switches from A to B, how to figure out the voltage wave form at B? When switch switches from A to B, charge has to redistribute between capacitors, but as the voltage across capacitor C2 can't change instantaneously initially there is a...

I'm making a rc cart with 4 wheels with rubber tracks on them. Two front wheels are powered by two dc motors 3.5-15[Nm] torque. Torque of 15[Nm] represent stalled torque. Let's say that friction between wheel axel and body of cart is minimal. Diamter of axle is 10[mm] and the diameter of wheel...

Homework Statement Assume there is a voltage source in series with a resistor and a capacitor. Thus, V_S=i(t)R+v_C(t)=CR\frac{dv_C}{dt}+v_C\rightarrow{}dt/(RC)=dv_C/(V_S-v_C) From this point I understand that one has to apply a negative sign to both sides before integrating, but why is it...

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...

I attached the problem. Is the answer they have for part b wrong? shouldn't the current be 0?

Heya! I've got a lab practical tomorrow to do with RC circuits, what do the terminals at the top and bottom of a filter circuit diagram mean, I'm assuming Vin and Vout is the voltage in and then 0V/ground, but what do the bottom two terminals correspond to? Cheers

1. The problem statement: What is the value of capacitance needed in Fig. 1 so that the voltage across the capacitor never exceeds (a) 200 V, (b) 20 V, and (c) 2 V ? This is the Circuit Homework Equations Vc(0-) = 0V Vc(0+) = 150V ic = c v' vc(t) = final + [initial -...

hello guys..i'm trying to make my first rc car..but m not getting the steering mechanism for it..is the steering mechanism for real cars applicable on it..?:confused::mad::rolleyes:

Homework Statement Homework Equations v(t) = v0*e^(-t/RC) i(t) = C*(dv/dt) E = .5*C*V^2 P=v*i The Attempt at a Solution I'm having trouble with part e. As far as I can tell, all of my equations are correct, but the total energy delivered is notably less than the initial energy; I was hoping...

We know that for RC circuit as filter or in multiplier we use capacitors having larger RC constant than the period of input signal.but I am confused here: As long as i know the charging and discharging period of a capacitor are equal wether it is fully charged or not...(tell me i am right or...

Homework Statement Calculate the steady state values of the current, voltages V1 and V2 (defined by a period of time greater than five time constants). (Circuit in ASCII below). + V1 - _________Res (1.2 kΩ)___________ | I => |...

Homework Statement A 10.0 uF capacitor is charged by a 10-V battery through a resistance R. The capacitor reaches a potential difference of 4.00-V in a time interval of 3.00 s after charging begins. Find R. Homework Equations C = Q/ΔV q = εC(1-e(-t/RC) The Attempt at a Solution...

hi, when i was making a rc coupled amplifier but as soon as i connect the input signal the signal gets distorted.can anyone tell me the reason for that and how to avoid the distortion? thanks,

Homework Statement S1 switch - always close. S2 switch is closed, until the capacitor voltage reaches 2V. given: R,C,V values. V0 = 0V. Need to find Vout while S1+S2 are closed and until S2 opens.Homework Equations Vc(t) = (Vi - Vf)*(exp -t/TAU) + VfThe Attempt at a Solution I have found the...

Hello all, I have a Integy 7.2V 1600mah battery that powers a RC hobby motor. I was wondering if RC batteries supply constant voltage to the motor for a certain amount of time before they start dieing or if the battery voltage continuously decreases as you power the motor until the battery...

Trying to understand the power network and synchronous machines, led me to the fact that I am not sure about the basics. The terms the generator is delivering or consuming reacting power made me halt. So I went back to my old course(which I allegedly passed) where the reactive power is...

Homework Statement Maximum current: I max = 4.62 * 10^-4 A Time constant of circuit: T = 3.9 secondsHomework Equations T= RC The Attempt at a Solution I'm trying to find the current after 1 time constant. Seems simple enough, the current changes by 63%. So (Imax)-(Imax * 0.63) or...

Homework Statement Three resistors, three capacitors, a battery and two switches are connected in the circuit shown below. The values of all circuit elements are given in the figure. Originally, the switches S1 and S2 are open (as shown) and all of the capacitors are uncharged. At time t =...

Here's the problem: Consider the circuit in which a battery with internal resistance r can be connected via a switch to a resistor and capacitor in parallel. Suppose that the capacitor is initially uncharged and then at time t = 0 the switch is closed. After the switch is closed a...

Homework Statement After a long time after the switch is closed. 1) Rank the current of each component. 2) What is the voltage across each component? Homework Equations The Attempt at a Solution 1) The current across B is the same as the capacitor C because the capacitor is...

Homework Statement A circuit is powered by a 10 V power supply and has a resistor of 500 ohms in series with a capacitor. After 4 seconds, the value of ln(1-(Vc/Vo)) is -2, where Vc is the voltage in the capacitor at a given time and Vo is 10 V. 1) Find the capacitance. 2) Find how long...

Homework Statement The RC circuit pictured below begins with capacitor C completely uncharged. I: What is the current at point A immediately after the switch closes? II:What is the current at point A 'at the end of the quaternary period' (I lol'd when he worded it like that) after the switch...

Homework Statement A 12.8 micro-F capacitor is connected through a 0.890 M-ohm resistor to a constant potential difference of 60.0 v. Homework Equations q=CE(1-e^(-t/(RC)) i=(E/R)-(q/(RC)) The Attempt at a Solution Compute the charge on the capacitor at the following times...

Homework Statement In the figure below, R1 = 13.0 kΩ, R2 = 18.0 kΩ, C = 0.600 µF, and the ideal battery has emf = 20.0 V. First, the switch is closed a long time so that the steady state is reached. Then the switch is opened at time t = 0. What is the current in resistor 2 at t = 4.00 ms...

Homework Statement Switch S in the figure below is closed at time t = 0, to begin charging an initially uncharged capacitor of capacitance C = 13.0 µF through a resistor of resistance R = 24.0 . At what time is the electric potential across the capacitor equal to that across the resistor...

Let's say you have a circuit with a resistor, capacitor and voltage source and a switch. I got a few questions. 1. The instant the switch is closed, the voltage drop would all be across the resistor right? 2. After a long time the switch is closed, the current would approach 0 and the...

Homework Statement A 4.1e-6 capacitor is connected in series with a 36V battery and a 851 ohlms resistor. At t= 0 the capacitor is uncharged. At what time will the capacitor have 80% of its maximum charge? Homework Equations I = V/R Q = CV I = Q/t The Attempt at a Solution I...

Homework Statement I attached the problem I don't understand why the 3 resistors at the top end up being in series for part b. can someone explain that to me. Homework Equations The Attempt at a Solution

Homework Statement In the circuit shown below the switch has been opened for a very long time and closes at t = 0. Calculate the output voltage VO at: 1: t = 0−; 2: t = 0+; 3: t = t1 = 24 µs; 4: t → ∞. In the circuit shown below the switch has been closed for a very long time and...

Homework Statement I need to know the cmoplex current out, the complex voltage out, phase shift of Voltage out relative to the voltage source, and if the filter is high/low pass with the cut off frequency. The circuit is series going 24V AC source at 1000HZ 0deg, to a 47 ohm resistor, to...