Capacitors Definition and 884 Threads

Homework Statement Suppose that C1 = C2 = C3 = 16.0 µF and C4 = 28.5 µF. If the charge on C2 is Q2 = 12.4 µC, determine the charge on each of the other capacitors, the voltage across each capacitor, and the voltage Vab across the entire combination...

Homework Statement A 2.70µF capacitor is charged to 475 V and a 4.00µF capacitor is charged to 525 V. (a) These capacitors are then disconnected from their batteries, and the positive plates are now connected to each other and the negative plates are connected to each other. What will be the...

A coaxial cable used in a transmission line has an inner radius of 0.10 mm and an outer radius of 0.60 mm. Calculate the capacitance per meter for the cable. Assume that the space between the conductors is filled with polystyrene. Kappa for polystyrene is 2.6 I have no clue how to start or...

Homework Statement Let's say I have a circuit that looks like that below http://img262.imageshack.us/img262/9260/97438850.th.png Uploaded with ImageShack.us Questions Now I got two questions a) If the middle (the one in 180 degrees) capacitor were not there, would still...

Homework Statement The distance between two parallel plates is increased while they remain hooked to a battery. The energy stored in the capacitor will: AND The distance between two parallel plates is doubled while they remain hooked to a battery. The battery voltage also is doubled. The...

Homework Statement At t=0m the switch is open and both capacitors are uncharged. What are the charges on each plate (magnitude and sign) of each capacitor long after the switch is closed and capacitors are fully charged? Homework Equations q=C E(1-e^(-t/RC) The Attempt at a Solution...

Homework Statement Two capacitors (C1 = 3.4 uF, C2 = 17.5 uF) are charged individually to (V1 = 19.2 V, V2 = 6.6 V). The two capacitors are then connected together in parallel with the positive plates together and the negative plates together. A. Calculate the final potential difference...

Homework Statement When two capacitors are connected parallel, the equivalent capacitance is 2.6 μF. If the same capacitors are reconnected in series, the equivalent capacitance is one-fourth the ca- pacitance of one of the two capacitors. PART A: Determine the capacitance of the...

how exactly can you tell if multiple capacitors are in series or parallel with each other? i know that if the negative plate of first is connected to the positive of the second and the negative of the second is connected to the positive of the 3rd and so on, it means that the capacitors are...

Homework Statement I am asked to find the charge on each cap in this circuit when S1 is closed: I am given that C1=1μF, C2=2μF, C3=3μF, and C4=4μF. V=12V Homework Equations Caps in series have an equivalent capacitance of Ceq=C1C2/(C1+C2), and caps in parallel have an equivalent...

Homework Statement The figure shows three circuits, each consisting of a switch and two capacitors, initially charged as indicated (top plate positive). After the switches have been closed, in which circuit (if any) will the charge on the left-hand capacitor (a) increase, (b) decrease, and (c)...

Homework Statement Capacitors of 19.1 uF and 2.1 uF are charged as a parallel combination across a 229 V battery. The capacitors are disconnected from the battery and from each other. They are then connected positive plate to negative plate and negative plate to positive plate. Find the...

Homework Statement I have three capacitors and a resistor in a closed circuit. I'm given the values of C: 15,20,10pF. They are all in series. The magnitude of each is 3.5nC. Homework Equations t = -RC ln(q/Q0) I = -Qo/RC e^(-t/RC) The Attempt at a Solution i've tried finding time first...

in AC source, C and R in parallel, why does the capacitor discharge when the voltage across the resistor decrease ? [PLAIN]http://upload.wikimedia.org/wikipedia/en/thumb/2/27/RC_Parallel_Filter_%28with_I_Labels%29.svg/250px-RC_Parallel_Filter_%28with_I_Labels%29.svg.png the Vin is a AC...

Homework Statement The capacitors in the figure are initially uncharged and are connected as in the diagram (attached). Then switch S1 closed and switch S2 is left open. After a long wait, what is the magnitude of the potential difference V_{cd}? Answer in units of V. Homework Equations C =...

Homework Statement The equivalent capacitance of the capacitors shown in the figure is 9.26 uF http://session.masteringphysics.com/problemAsset/1122585/1/Walker.21.58.jpg Homework Equations Cseries = 1/Cs = 1/c1 + 1/c2 + ... Cparallel = Cp = C1 + C2 + ... The Attempt at a...

I hooked up four capacitors in parallel to a solar charger and found that they all acquired the same voltage. Why is this? I thought that capacitors took energy from the source, which would imply that the second, third, and fourth capacitor had less voltage than the previous one.

Homework Statement A 25pF parallel plate capacitor with an air gap b/w the plates is connected to a 100v battery. A Teflon slab is then inserted b/w the plates and completely fills the gap. What is the change in charge on the positive plate when the Teflon is inserted? Homework Equations...

Homework Statement In the circuit below, C1 = 5 microfarads, C2 = 10 microfarads and R = 1000 ohms. Initially, the switch is open, C1 is charged to 20 volts, and C2 is uncharged. At time t=0 the switch is closed. I think I managed to solve the first two but I have troubles with part (c)...

this isn't homework, I am doing revision for an exam :) a 180 microfarad capacitor is charged so that is has a PD of 100v across the plates. i calculate the energy stored as 0.5cv² = 0.9J the question then asks me to calculate the work done by the battery in charging the capacitor. the mark...

----C1------C2------ If the left and right plates of C1 are +ve and -ve charged respectively and the left and right plates of C2 are +ve and -ve charged respectively then why doesn't the current flow from the right plate of C1 to the left plate of C2 when they are connected in series?

Homework Statement A small plastic ball of mass 5.54 x 10-3 kg and charge +0.174C is suspended from an insulating thread and hangs between the plates of a capacitor (see the drawing). The ball is in equilibrium, with the thread making an angle of 30.0o with respect to the vertical. The area...

Question is in pic ... Well its a MCQ so options are: (A) With S1 closed, V1 = 15V and V2 = 20V (B) With S3 closed, V1 = V2 = 25V (C) With S1 and S2 closed, V1 = V2 = 0 (D) With S1 and S3 closed, V1 = 30V, V2 = 20V i know that anything connected to Earth comes to zero potential, but...

This was a ques in my book ... (Pic) After thinking a while, i realized that it can be solved using Y-Delta (by converting Y to delta form) conversion. But i couldn't get the answer ... i don't know why ... I used this http://en.wikipedia.org/wiki/Y-%CE%94_transform" It is given for...

Homework Statement The capacitors are charged to a potential V1 and V2. The self inductance of coils are L1 and L2. The mutual inductance is M. Analyze the dynamics of the circuit. Homework Equations The Attempt at a Solution I wrote down Kirchoff's Loop Law (or Voltage Law) to...

Hello everyone, I have a few microwave caps rated at 2100 Volts AC and was wondering about their DC rating. I've heard that the DC rating of AC caps is usually 3-5 times the AC rating which seems to make sense but I'm not absolutely sure... If someone could please confirm or deny this I'd be...

Homework Statement Two capacitors with capacitances of 1.0 μC and 0.50 μF, respectively, are connected in series. The system is connected to a 100 V battery. What charge accumulates on the 1.0 μF capacitor? Homework Equations For capacitors in series: 1/C(equiv) = 1/C1 + 1/C2 V =...

I know that the equivalent capacitance for two capacitors in parallel is C1+C2=Ceq. But consider I charge 2 plate capacitors so that each capacitor has a positive and negative plate and then I connect the positive plate of one cap. to the negative plate of the other capacitor in a parallel...

Homework Statement Which of the following capacitors (A vs. A2, which are identical) will have a larger charge, charge accumulation, voltage, energy stored? (Assume that the only difference between the two circuits is the size of the other capacitor in the circuit, as shown.) Homework...

hi there , I Have a Question For You, I`m a 16 Year Old Girl From Iran And This Is My first Time That I`m Visiting Your Website, I know How To Identify parallel and series Capacitors in Simple Electrical circuits, But Can You Help Me To Know More About It , Esp. In Complex circuits?

Ok, so I need to "charge up" 8 560UF, 250 Volt DC capacitors. I would prefer to be able to charge them in series, as I am going to use them to construct a rather small capacitor bank. Any suggestions? Thanks!

Hey guys, I was wondering why we can not have instantaneous voltage through a capacitor and instantaneous current through inductor?, Can you explain to me why it can't happen mathematically, and physically? I know that Voltage in a capacitor is V = C dv/dt and current in inductor is i = L...

hello i am new to this forum so let me start off by saying this was the most likely place to post this (hopefully). i connected a small capacitor to a 110v wall socket, i want to attempt something similar in retrospect with a 1 farad capacitor (it is a car audio capacitor) was curious to...

in this circuit I've found out the function of every component except R4, R5 and C4,C7 and C8 ... can anybody please explain the purpose of R4, R5 and C4,C7 and C8 ? [PLAIN]http://www.2electronic.com/wp-content/uploads/2010/03/cellphone-detector.jpg also the Capacitor C5 (47pF) is connected...

[b]1. Two capacitors, one 7.2 \muF the other 16 \muF, are connected in series across a 15 V battery. Find the charge stored on 7.2 \muF capacitor. Find the charge stored on 16 \muF capacitor. [b]2. C-eq =5.0\muF and V=Q/C and \epsilon=Q(1/C-eq) [b]3. I know that both Q values...

Homework Statement A C_1 = 2.40 \mu(micro) F capacitor is charged to 861 V and a C_2 = 6.40 \mu(micro) F capacitor is charged to 662 V. These capacitors are then disconnected from their batteries. Next the positive plates are connected to each other and the negative plates are connected to...

Homework Statement Two capacitors C1 = 5 μF and C2 = 2 μF are initially charged to a potential difference of V = 100 V. They are inserted into the circuit with opposite polarities as shown. Switches S1 and S2 are now closed. What is the magnitude of the potential difference between points A...

Homework Statement Contrast capacitors and inductors. Homework Equations The Attempt at a Solution I THINK it can be said: capacitors act as a slowing device, or "inertia" to changes in voltage since they store energy in an electric field. Conversely, inductors act as a slowing...

Hello, I have been pondering how to plot the instantaneous rate of change of one capacitor into another through a resistive impedance R. So for example you would have C1=1 farad (100volts) C2= 10 Farad (Zero volts) R1 = 100ohms So one would have Capacitor 1 at 100 volts, discharge...

Homework Statement Homework Equations Q=CV The Attempt at a Solution For part A, I've tried working out the algebra, with the assumptions that V1 + V2 = V and Q1 + Q2 = Q Basically, I solved Q by finding the equivalent capacitance, then said Q1=C1*V1 and Q2=C2*V2 Then by my...

I have a circuit consisting of a battery and several capacitors, some quantities are known and some are not. The capacitors were completely uncharged before the battery was attached and we are considering the static situation. (Be sure to keep at least 3 sig. figs. in your answer for all parts...

I was wondering how long would it take to charge a capacitor at 5volts if there are 4 parallel. This is the details on the Capacitors. 330v 120uF each. So what is the best way to charge them by usb which gives me 5v or using a 9 volt battery and for how long.

Homework Statement Find the voltage across the capacitors in the circuit given under DC conditions.Homework Equations V=IRThe Attempt at a Solution The solution is already given (the picture attached was obtained from the solution manual. I have a difficult time understanding how they arrived...

Diagram of problem attached below. I don't know where to begin with this problem. How can I find i(t) if I am not given v(t)? Since i = C dv/dt , don't I need the function v(t) to solve this problem? Is it possible to use the function v(t) = v(0) e-t/(RC) , if so, then what would the...

what should be a simple capacitor question. Hello, I have a question I have been pondering for a bit, me thinks it should be simple, but I cannot seem to get it straight. Imagine two capacitors leg to leg. each has 10 farads. Each is charged to 100 volts. Each should have a charge of 1000...

Homework Statement A voltmeter of resistance 150kilo Ohms is connected across a 50 micro F capacitor. If at time t= 0 the voltmeter reading is 20V. Find a) charge on capacitor at time t=o b) voltmeter reading after 10s c) the time which must elapse after t = o before 95% of the...

I was wondering for a series of capacitors connected together (after full charging), is there a voltage difference between the negative plate of one capacitor and the positive plate of another capacitor down the line? -------+q||-q(a)-------+q(b)||-q------+q||-q---------- i.e. between points...

Can you tell me if I'm right with this. If you charge ten 1F capacitors in series at 10 volts. Each capacitor has a voltage of 1 volt and a charged capacitance of 0.1F. So if you discharged the ten capacitors in parallel the output would be equal to 1F of capacitance charge and 1 volt. or would...

Homework Statement Consider the circuit in the figure below, in which C2 = 16 µF and V = 80 V. Initially, the switch in is in position A and capacitors C2 and C3 are uncharged. Then the switch is flipped to position B. Afterward, what are the charge on and the potential difference across...

Homework Statement Please see attachment. I really need someone to check this properly please- I know this is meant to help people but checking this would be a huge help to me since its worth marks...(Ive done all the work) THANKS A LOT to anyone who helps.. Homework Equations...