Rc circuit Definition and 396 Threads

Hi, I have a question. So, I've built this simple RC circuit. Of course, the pulse width is then obtained from the oscilloscope. But, according to equation Vo(t) = E(e^(-t/RC)), the value t (pulse width) is larger. Considering the resistor, condenser, Voh, Vil, IC delay, and others, how should I...

Homework Statement http://apcentral.collegeboard.com/apc/public/repository/_ap06_frq_physicsc_em_51784.pdf Please please check out Q2 part (d) on this test Homework EquationsThe Attempt at a Solution I understand that before S2 is closed, current through the circuit is zero. As soon as S2 is...

Homework Statement All information is given in the picture posted Homework Equations V=IR , Q=CV The Attempt at a Solution What I don't understand is , when the capacitors are initially uncharged , they should just be treated as wires , if this is the case , then the entire circuit is...

Homework Statement Two resistors and two uncharged capacitors are arranged as shown above. Then a potential difference of V0 = 12 V is applied across the combination as shown. a. What is the potential at point a with S open? (Let V = 0 at the negative terminal of the battery.) b. What is the...

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...

Homework Statement Homework Equations q(t) = Cε(1-e^(-t/RC)) The Attempt at a Solution for part a) the instant the switch is closed there is no charge on the capacitor so I am pretty sure I can ignore it for this part and use keirchoffs rules to find the currents through each resistor...

Homework Statement Homework Equations ##q = Q(1-e^{\frac{-t}{RC}})## The Attempt at a Solution Don't know where to start...

Homework Statement [/B] With a 12V battery, a 5.00µF capacitor and a 8x105Ω resistor determine the following: a) The time constant of the circuit b) The maximum charge on the capacitor c) The maximum current in the circuit d) The charge on the capacitor as a function of time, q(t) e)...

Homework Statement The circuit contains an ideal battery, two resistors and a capacitor (C= 250 μF).The switch is closed at time t = 0, and the voltage across the capacitor is recorded as a function of time as shown in the graph. Homework Equations time constant = RCThe Attempt at a...

Two capacitors of value 10, 20 microfarads are connected in series. Then charged with a 100 volt battery. If the capacitors is disconnected from the battery, and then connected to a 2500 ohm resistor, what is the voltage across the capacitors after 1 second?

Homework Statement In the circuit below the switch is initially open and both capacitors initially uncharged. All resistors have the same value R. a.) Find the current through R2 just after the switch is closed. b.) Find the current through R2 a long time after the switch has been closed. c.)...

Homework Statement Consider the following circuit in a camera flash where a light bulb is in series with a charged capacitor: a) Derive, but do not solve, the governing differential equation for the circuit. (Hint: treat the resistor and the light bulb as a single resistance.) b) Assume...

1. Homework Statement The switch is closed. Graph the current in R_{1} 2. Homework Equations V = IR CV = Q 3. The Attempt at a Solution 1) R_{0} can be ignored a) The resistor simply reduces the voltage before any current can be split. b) We're justified, as a result, in...

Homework Statement Hello I want to solve the following circuit, I want to know how the voltage on R1 and R2 develop with time, It start at t=0 when there is no voltage in the circuit ( all V=0). Its a symbolic question, I need to show the equation. V1(t) = ? , V2(t) = ? The current is a DC...

Homework Statement Find the resistance of resistor R7 when the switch is turned on so that the power of that resistor is maximum in the circuit. The voltage of the capacitor before the switch is turned on is Vc=200V. Homework Equations Thevenin's theorem The Attempt at a Solution I...

Homework Statement See the imgur link http://i.imgur.com/yZsyoHx.png Homework Equations See the imgur link The Attempt at a Solution I am just reading a problem in the textbook and am not solving the problem Basically I am looking for a good explanation of how current behaves and components...

Homework Statement A voltage source given by ##v_s(t)=25cos(2\pi\times10^3t-30^\circ)## is connected to a series RC load. If R = 1MOhm and C = 200pF, obtain an expression for ##v_c(t)##, the voltage across the capacitor. Answer known to be: ##v_c(t)=15.57cos(2\pi\times10^3t-81.5^\circ)##...

Homework Statement Make a blode plot of a series RC high pass filter (log(gain) vs. f)... Homework Equations log(Gain)=log(Vout/Vin) I'm pretty sure the "Gain" is just the transfer function, for a highpass it should be the V_in = Vsupply, and V_out = V_capacitor. The Attempt at a Solution I...

So I am awere of everything in electromagnetism in physics,but lately I am enjoying in creating RC cars.But I only got to making a car going only forward,how can i make him turn?How could I transform only a part of the electrical energy into mechanical so that my RC car can turn left and right...

Homework Statement In each of the four circuits shown, an AC input voltage, ##V_0 cos(\omega t)## is applied on the left and the output voltage is measured on the right. Treat the input frequency as a...

Homework Statement There is a circuit with a battery of voltage V and resistor R, then splits into two branches one with a capacitor C, and one with a resistor 2R. The answers for the questions can only depend on R, C, V, and t. When a switch only allows current to flow through the capacitor...

Find the potential of point a with respect to point b in the figure (Fighttps://s.yimg.com/hd/answers/i/1ffe0f8aeaf145679cde38f7812b1c7f_A.png?a=answers&mr=0&x=1413484693&s=0943630e47eb74ae023909f7d39f74e3 ure 1) . If points a and b are connected by a wire with negligible resistance, find the...

Consider a series RC circuit with an R = 3.0 Ω and a capacitance of 12 µF being charged to a voltage of 5.0 V. (Note, you will not include units in your answers.) If you wished the charging of this capacitor to have a vertical displacement of 4.0 DIV from 0 charge to fully charged, what value...

Homework Statement Assume you have a fully charged capacitor with initial condition V(0) = V_0 connected in series to two resistors R_1 and R_2. Derive an expression for the voltage over the capacitor with respect to time. Homework Equations 1. Kirchhoff's voltage law \sum_n V_n = 0 2. Ohm's...

Homework Statement part 1 Consider the circuit of figure G, where R1=20 ohms R2=10 ohms X1=37.7 ohms X2=-53.1 ohms. Compute the current and the phase angle between the current and the applied voltage. In the figure R1 is in series with X1 and R2 and X2 are in series. R1 and X1 are in parallel...

Homework Statement I'm supposed to find the current in a circuit with a voltage source, capacitor, and resistor in series. The voltage source is described by V=V0ejwt. Here, j is the complex number j2=-1, and i is the current Homework Equations I=C*dv/dt The Attempt at a Solution I have...

Hi there. I'm trying to evaluate the energy dissipated due to Joule effect on a resistor within an RC circuit (R, C, and battery in series), with the capacitor initially uncharged. Till now I just came up with the formula for the current flowing in the circuit i(t) = e^{-\frac{t}{RC}}, resulting...

Homework Statement My question is very simple and perhaps it has an obvious answer. So, if we have a simple RC circuit with and EMF battery, a resistance and a capacitor, when the capacitor is charging, electrons leave the negative terminal of the battery and accumulate on one of the...

Homework Statement The emf of the battery in the given circuit is ##\epsilon = 8.0 V##. (a) Calculate the time constant of the circuit. (b) Calculate the charge in Coulombs when the capacitor is fully charged. (c) If the effective capacitor is allowed to discharge through the effective...

In a simple series circuit there is a 12V supply battery, 12μ6 F capacitor, a Resistor, and a 2v drop LED with an imax of 30mA. frequency is 10Hz Calculate the resistance of the resistor so that the LED just stays on. Homework Equations Resistance of Capacitor Xc = 1/2∏fC P=VI V=IR...

Homework Statement This is the Problem with the answer: Homework Equations V=RI V_{c}(t)=V_{0}e^{-t/(RC)} The Attempt at a Solution Actually, this is a topic about laplace transform. I tried to solve the problem using the formula. @t<0 I=40/(3+8) = 40/11 A V @ 3 ohms =...

Homework Statement Image The Attempt at a Solution I know how to solve for a and c. a: 300V / (300Ω) = 1 A c: 120V / (200Ω) = 0.6 A what I don't understand is how they solved for B (0.6A), considering the current is 3A provided by the capacitor. I initially tried to...

Homework Statement Hi I got this problem and have to fill out this table. Homework Equations node analysis time constant = RC ic(t)= C dVc(t)/dt The Attempt at a Solution I got few answers which i worked it out. i (0-) = 0 Vc(0-) = 1.84 Vr(0-) = i (0-) *...

[Mentor's note: this thread does not use the standard homework-help template because it originated in a non-homework forum. It was moved here instead of being deleted because it had already gotten significant help.] "A capacitor is being charged from a battery and through a resistor of 20...

Homework Statement My textbook has two problems, based on the same premises, but the solutions manual solves each of them differently, so I was wondering why? Here are the two problems... 1. In the circuit shown in Fig. P29.49, the capacitor has capacitance C = 20μF and is initially charged...

Hello there, I'm not sure if my solution is correct for \hat{I}_{C} Homework Statement In the given circuit, calculate the current in each circuit element given that V = V_{o}sin(ωt) R, L and C are given. http://imgur.com/yO3flg8 Homework Equations Z = R + jX (j^{2} = -1) X_{L} = jωL X_{C} =...

Homework Statement I have got this circuit: I have to find coefficients k1 and k2, and time constants T1 and T2. Actually, we can see that T1 =R1*C1 and T2=R2*C2, but is it possible in this circuit or it's just theoretically time constants? I'm not sure, but as there is no amplifier in...

Hi all, my task is to measure the charge time of an RC circuit with a counter using FPGA, once the cap is charged, i must discharge it again for next input. Idea is to discharge it with a signal from FPGA, but what sort of circuit would allow this without discharging the cap prematurely...

Homework Statement (Challenge Problem 80, Ch33) A rectangular metal loop with 0.050 ohms resistance is placed next to one wire of the RC circuit shown in the below figure. The capacitor is charged to 20 V with the polarity shown, then the switch is closed at t = 0s...

Homework Statement Hi, If there is a series combination of a resistor and an initially charged capacitor, I know that the decay of the voltage is given by the equation v(t) = Ae^(-t/RC) where V(0) = A = V0. But i am unsure of how to get to this equations. Homework Equations If I assume...

Homework Statement A resistor with resistance R and a capacitor with capacitance C are connected in series to a direct current battery ε. find the current and charge on the circuit as function of time. it looks more like a review of differential equations, so I'm not really sure if I...

Homework Statement A RC parallel circuit with an impedance of Z = 105000 Ω ∠ -27 and frequency of 50 Hz. Homework Equations I need to find out what the R and C values using the information given. The Attempt at a Solution I know the impedance for a parallel RC can be calculated...

Homework Statement Specifically #13 only. Homework Equations Same image as above. The Attempt at a Solution Loop equations 10 - 500,000* i1 - 500,000 * i2 - 500,000 * i3 = 0 10 - 500,000* i1 - q/ 5 * 10^-6 - 500,000 * i3 = 0 Junction equations i1 = i2 + dq/dt i1 = i3 Solving for i1 in...

Homework Statement Consider the circuit below. If the source υs represents a 12-V, 100-ms-long rectangular pulse that starts at t = 0 and the element values are R1 = 6 kΩ, R2 = 2 kΩ, R3 = 4 kΩ, and C = 15 μF, determine the voltage response υ(t) for t ≥ 0. Homework Equations The...

Homework Statement 2. The switch in the circuit below had been closed for a long time before it was opened at t = 0. Given that Vs = 10 V, R1 = 20 kΩ, R2 = 100 kΩ, C1 = 6 μF, and C2 = 12 μF, determine i(t) for t ≥ 0. Homework Equations The Attempt at a Solution For this problem...

Homework Statement Switch S has been open for a long time. It is then suddenly closed. Determine the time constant (a) before the switch is closed and (b) after the switch is closed. (c) Let the switch be closed at t=0. Determine the current in the switch as a function of time. Homework...

Homework Statement The switch in the figure below has been in position a for a very long time. It is suddenly flipped to position b for 1.65 ms, then back to a. How much energy is dissipated by the 50 Ω resistor? (Assume = 65 V.) Homework Equations ΔVloop = 0 Volts Q/V = C V = IR...

Homework Statement Consider the circuit in the figure below, in which V = 85 V, R = 40 , and the switch has been closed for a very long time. (a) What's the charge on the capacitor? (b) The switch is opened at t = 0 s. At what time has the charge on the capacitor decreased to 10% of...

Homework Statement Attached. Homework Equations The Attempt at a Solution Attached. I am looking at the circuit at t<0. I need to calculate v(0) but I'm not sure how to apply nodal analysis when you have a capacitor in the circuit. Do capacitors follow ohm's law?

The biggest problem is that I have no knowledge about the math for oscilliscopes. This is a post lab but all we actually did was push a few buttons to record measurements, we did not go into any detail about the methods, just what an oscilliscope was supposed to measure. Homework Statement...