Discharge Definition and 256 Threads

I am a fisheries biologist interested in manipulating a lake level by about six inches via a box cement outlet structure on a small lake. The outlet structure is currently governed by two adjacent 5ft by 0.5ft dam boards,which have historically been removed one at a time in the spring and...

This is the problem and it's actually in my calculus book to illustrate the concept of a limit in experiments: The flash unit on a camera operates by storing charge on a capacitor and releasing it suddenly when the flash is set off. The data in the table describe the charge Q remaining on the...

I have been informed that such devices can produce large voltage sparks from low voltage power supplies, but i was always under the impression that capacitors discharge in a manner that is simply the opposite of the charge graph. 1)So how do these circuits work? and 2)Are the US navy using...

Homework Statement [LIST] It was a standard venturi meter experiment where we calculated the theoretical and actual mass flow rates for different pressures and velocity's. the follow up questions were: -Compare the results of the coefficient of discharge obtained with typical values given...

Homework Statement What is the shortest time after which there would be no measurable charge on a 5.0 microfarad capacitor that is charged, then discharged across a 2000 ohm resistance. a. 0.001 s b. 0.5 s c. 10 s d. 3600 s Homework Equations The Attempt at a Solution According to the time...

I would appreciate any help, opinions or explanations on this as I am receiveing many different views currently. I measure the discharge voltage of a single power supply (laptop ac charger) using a digital chart recorder. On a trial and error basis I achieve the data as close as possible to...

I'm designing a circuit to discharge a capacitor though a coil of wire to make a large magnetic field, which is basically an undriven RLC circuit which starts out with a charged capacitor in series with an inductor and a resistor (the coil having a certain resistance in addition to its...

RC Circuit discharge question - test prep for tomorrow Homework Statement A charged 6\muF capacitor is discharged across a 2\Omega resistor. How long does it take to lose half its stored energy? Homework Equations ...so many: Q = CV V = IR W = I2R U = 1/2 QV V = V0e-t/RC The...

Homework Statement This is more of a question: In class, we solved an example with water leaving a tank from a faucet on the side and near the bottom. The result was v=(2gz)^(1/2)... the Torricelli equation. What I am wondering is if the solution would change if the faucet were located at...

Homework Statement A capacitor is charged to 1 coulomb; the capacitance is 6.00×10-5 farads. Then a switch is closed which puts the capacitor in a closed circuit with a resistor; the resistance is 9.20×10^1 ohms. Calculate the charge on the capacitor after 4.00 milliseconds. (1 ms = 0.001 s)...

capacitor discharge? Homework Statement A 1.4 uF capacitor, initially uncharged, is connected in series with a 10 k ohms resistor and a 6 V battery of negligible internal resistance. How long does it take the capacitor to reach 99% of its final charge? this is part b. i already...

Why is it that someone who discharges static electricity feels a sting but the person who is receiving the static electricity doesn't feel anything? Thanks

Let's say that we have two capacitive sources of power: 1) ten parallel 450V 1800uF 138.8mOhm-ESR capacitors 2) one 450V 18000uF 13.88mOhm-ESR capacitor Both sources contain 1,823J of energy. The source containing ten capacitors is advantageous for my purposes due to the fact that the...

hi. my question:why the harm of discharge of thunder in village is worse than cities?

I have been testing this equation with various different capacitors and capacitor bank values for V, R and C. I have found that when combining two capacitors in series (V doubles, C is divided in half, R is doubled) the following equation yields the same I-curve over t as a single capacitor...

hi ,to all forums member from mahek.please help me out for understanding the basic concept of capicitor and homework it,s charge and discharging operation of it.

Hi All, I would like to know what is the main reason to build those metalic apparatus to receive the discharge of a lightning near houses. I am concerned with its shape and its physical explanation. Any help will be welcome, Thank you all Best wishes DaTario

Homework Statement A 10 microfarad capacitor is initally charged to 15 volts. If the capacitor then discharges through a 12kohm resistor how long before the charge stored has falled to 0.8 x 10^-4 C? Homework Equations Q=CV Q= Q_0 x e ^(-t/RC) The Attempt at a Solution...

Homework Statement Inductor 12 Henry, energy supply is Emf knot. At t=0, the switch is opened which leads to rapid discharge along a resistor. The flash from the discharge lasted 50 ms. What is the resistance of the resistor? Homework Equations I know to use i=Ie^(-R/L) t but what...

Homework Statement I am trying hard to figure it out how to slow down the charge and discharge current in the RC circuit. If i put the big resistor, it takes long to charge but there is barely any current you can see and also when it discharges. What I am trying to do is, to slow down the...

Hi, I just wander what hapeens if photon which energy is higher than difference of adjacent energy levels collide with atom? How does Excess energy go? transmiting atom by form of photon or giving motional energy to the atom? Second Question is What does process ocurrs when enough...

In the RL Circuit Discharge and RCL Circuit, if you had only measured the resistance of your resistor and not taken into account the resistances in the inductor and function generator, how would this affect the calculated inducted from the half life measurement?

Hi everyone, I'm not sure if this is a basic EE problem as I'm in aerospace and I would like to apologize if i posted in the wrong forum. I've attached a circuit diagram of my design. The capacitors and the 2 higher resistors are of variable values. The switch and the lower resistor...

I read on another forum, some person says (read below) when you charge one cap, then discharge into another, there is 50% efficiency loss? I think this is wrong, as the only losses I can think of, are due to the caps ESR when there is a voltage difference between the caps. Can someone help...

Hi all I was wondering if anyone could help me with calculating or finding the discharge coefficient for a fully developed turbulent flow through a vena contracta many thanks nar

Hi, I have a question, it is related to flows between two resorvoirs where I need to calculate the discharge between two pipes, with different pipe diameters. The problem I have come across is where there is an expansion in the pipe size from 250mm diameter to 300mm, the formula states...

[FONT="Times New Roman"][SIZE="4"]Hi all, I want to know the details of the pumps such as [SIZE="4"][FONT="Times New Roman"]Which of the pump has the highest head? Which one has the Highest Discharge? The one highly recommended for lubrication oils? [FONT="Times New...

Ok, so I've heard two conflicting things about real capacitors and I'm trying to clear up my understanding. It's possible they were in different contexts. This pertains to a RC circuit. It's a real capacitor so it will have some internal resistance too. It's also a high-voltage capacitor...

Hi, I am studying an engineering program in university. I have a piece of lab coursework to do and I am struggling to find information on it. The lab report was based on 'The discharge of a capacitor with time using an oscilloscope' It sounds silly but what is the theory of a capacitor...

Suppose I have a simple DC circuit. If I wrap the wire around a piece of iron, I create an inductor. Having a steady flow of current creates a steady magnetic field around the piece of iron. If I remove the power supply and put a wire in its place, the magnetic field will collapse and send a...

Homework Statement What is the best way to discharge the capacitor? Explain Homework Equations The Attempt at a Solution I know two ways but I'm not sure if they're the "best" ways. One is by touching both wires of the capacitor to something made out of metal. The other is holding...

How does ESD affect Aircraft and Aircraft Components?? Does anyone know?? Thanks...

Homework Statement A capacitor is charged to 1 coulomb; the capacitance is 8.00×10-5 farads. Then a switch is closed which puts the capacitor in a closed circuit with a resistor; the resistance is 8.60×101 ohms. Calculate the charge on the capacitor after 4.00 milliseconds. (1 ms = 0.001 s)...

Homework Statement A circuit consists of 3 components connected between 2 terminals: A 6 V source, a 60 ohms resistor and a 0.02 F capacitor. The capacitor is initially uncharged. The voltage source is turned on. What is the current flowing through the above capacitor after a very long time...

hi all, wonderign whether you can help with this problem with capacitor discharging. take a look at the pic the question is In the circuit shown above, the switch has been in the upper position for a long time and moves to the lower position at t = 0. Find i(t). Basically, first i...

Ozone Generation (Help required) I am working on the project of "Ozone generation". Generation of ozone is done using discharge tube working at around 6KV. But the source from where I got the details of the project doesn't provided the information on the construction part of it. Please...

One of the discussion questions (ie. questions to think about) on a lab that I just did in physics asked where the energy in a charged capacitor goes when the capacitor is discharged. I know the energy is calculated using 1/2*C*(dV)^2, but I cannot figure out where this energy is transferred as...

WE're usign a steel ball bearing for our physics rollercoaster project, and we happened to store the ball ontop of a decently strong magnet over the course of a few nights, and we believe that the ball is magnetized because the ball slows down at parts of our rollercoaster where there is any...

I have a few questions concerning capacitators. 1.) When exactly does a capacitator discharge. Is it only when its voltage equals that of the power source and cancel each other out or is the capacitator always discharging at a slow rate. 2.) I read that when you use a capacitator in...

Hi all, I am a newbie reseacher postgrad. My work will be the title above and is anyone know whether it falls in Quantum Mechanics or general Electromagnetic physics? Actually what is so different in Quantum Mechanics since I saw it seems having some corrrection in EM radiation/photon...

My buddy works at an extremely small (4 guys and a room) computer parts recycling and disposal place. They want to be able to take apart old monitors but are afraid of the potential shock from the main caps. I am told that the voltage can get up to 25,000 volts (I'm not sure of this value) and...

I have just now seen this long exposure photo on http://en.wikipedia.org/wiki/High_voltage" from an electric discharge. Is it just me or does it appear that each discharge is taking an almost exact path down the length of the arc. I need to know if this is just a coincidence, and if not...

Hello All, I have another set of quick questions that may or may not have a quick answer :smile:. When a simple two-electrode spark gap discharges, what shape do the eclectic and magnetic fields take on? If I were to draw the electric and magnetic field vectors, would they be pointing...

Dear friends, I am building a CDI system to ignite fuel mixtures in a pressure chamber for flame speed measurements. I need a capacitor of about 5 nF, but it should hold up to 10 kV. Any suggestions on where I can get those. I also need a diode (rectifier) for 10 kV. Also I need high...

I have been trying to figure out what the equation is for this problem: A glass tube filled with gas has electrodes at each end. When a sufficiently high potential difference is applied between the two electrodes the gas ionizes; electrons move towards the positive electrod, and the positive...

I don't have a clue on where to start this as i don't know what other figures to use. Dry air will break down and generate a spark if the electric field exceeds 3x106N/C. How much charge could be packed onto a green pea (diameter 0.75cm) before the pea spontaneously discharges?

OK, here is my frustration: I go to my lab, exchange equipment several times because some equipment is bad or wrong, do an experiment to show the time constant. First we charge the capacitor. Trial and error to find a good time increment. THEN, its time to discharge. AFTER 10 minutes of the...

Ok. So putting capacitors in series decreases the capacitance of the circuit (and correct me if I'm wrong any where in this, and I'm likely to be). So this would mean it would take less time to charge, I'm assuming. What if you charged a set of, say 3, capacitors in series, then hooked them up...

Hi all, everyone has experienced electric shocks when discharging oneself, for example when you have clothes made of wool and take them off, or if you touch a metal object after walking across a carpet. My question: Why do you hear the discharge? I've noticed when getting the laundry out...

for the following question: spectroscopic observation of molecular N2 in an electrical discharge shows that the relative numbers of molecules in excited bivrational states with energies given by (epsilon)i=(i+1/2)hv are i 0 1 2 3 ni/n 1.00 0.25...