Discharge Definition and 256 Threads

Dear all, I have found in the literature that if there is a open tank discharging water into the atmosphere the pressure at the discharge point is considered to be equal to the atmospheric pressure. If one looks to the Bernoulli's equation and assuming no friction: Pressure +...

I know this is a general Mechanical Engineering forum, but there is no Hydraulic forum and this is the nearest trade. https://www.youtube.com/watch?v=47Dx6TvuJTc I've been doing a project on electrostatic discharge, and the company I work for (I won't mention the name as I'm not here...

Hello, I am working on a creating the characteristic equation (in general terms) of the voltage (and current, but not as important) for the capacitor in a RC connected to a LR. The RC circuit is initially charge (say has been connected to a power supply for all time before t = 0) and at t = 0 a...

I have a 12v DC (rotary vane type) pump that is connected to a 12v auxillary battery. The battery is 12vDC 70Ah and it charges itself with the truck's alternator, which is 12 volts, 35 amps. the pump is 1/4 hp, and it draws 20 amps max. The problem is, the discharge output of the pump is very...

This is a part of a homework question, and a concept that is expected to be understood. "Why do you think discharge tubes have a narrow waist?". I was thinking about attempting the question like this: Discharge tubes are mainly used to view spectra. And hence a thin tube, will allow a thin...

Hi, I’m trying to calculate the resistor value and power from discharging capacitor (1000uF, 300V). Attached herewith is the calculation for discharge capacitor. the problem is that the result show that when I’m using 5k resistor I will need 11W (2), but when I’ll use 1k resistor, I only...

Hi, I just joined this forums. I'm currently doing my master thesis in mechanical engineering, however, my topic is related to plasma physics. As part of my results, I need to simulate an audio frequency electric discharge in a spark plug in air, in Ansys HFSS software. The discharge is...

Notice how the recycling deck's bottom edge curves out, where the Hi-Vac's is curved inward. A bag or mulch plug can be installed on either deck, but each design is most effective when used for their intended purpose, mulching and bagging respectively. And although the side discharge shoot can...

To anyone that can help me, Hello everyone. I am student from Mechanical Engineering and I am very new to electronic field. I currently doing my final year project which is developing the high voltage discharge circuit for the DBD plasma. The middle electronic elements is the representative...

Dear Experts i have a solar panel but the current is not high enough . I have about 5 volts to charge giving about max 100mA (specs). I am thinking of using a Capacitor to store all the low currents such that when the capacitor is fully charged, I need a circuit to discharge all the...

Homework Statement When a person shuffles across a dry carpet, their body can be modeled as a charge 100-pF capacitance with one end grounded. Then, if the person touches a grounded metallic object such as a water faucet, the capacitance is discharged and the person experiences a brief...

I'm trying to put some LED's on our racecar. They're 7 segment LED panels where each segment is 5 LED's with a 220 ohm resistor on the end. The car runs on 12 volts with engine off and 14 with engine on. I have power (Vin) coming off a distribution block, ground also goes to a...

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...

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...

I understand corona discharge in electrostatic situations, but in circuits without capacitors/gaps, I don't understand why it can ever happen (since as far as I know, the electric field is virtually 0 in the air around such a circuit). So why is there corona discharge around high-voltage power...

The diagram attached is a picture of the problem I have. I have a 10ft tall cylindrical tank with 20ft of pipe directly under it. The tank at full capacity can hold 100 gallons of water or 10 gallons per ft. I want to calculate the pressure of the water right before it leaves the pipe 20ft...

When a high voltage is applied across the electrodes of the discharge tube, and the pressure of the gas inside the tube is lowered, the electrical energy knocks out some of the electrons from the atoms. These constitute the cathode rays. How does electrical energy knocks out electrons is...

A pipeline is 8 km long and is required to convey water from a reservoir, at 500 m above datum, to the intake of a water treatment works at 425 m above datum. If the pipe has a diameter of 225 mm, what is the discharge of water through the pipe? The density of water is 1000 kg/m3. relevant...

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

In this scenario, C2 is charged to 100V and C1 to 0V. Wouldn't the current go in the other direction, unless I misunderstood something? The only reason I can see why the current is displayed in this direction is because we're asked to find V2(t), and doing it this way you'd find a negative V2...

Homework Statement You have a capacitor, of capacitance C farads, with charge Q coulombs. It is connected in series with a resistor of resistance R ohms. Derive an expression for the potential difference over the capacitor at any time t.2. Homework Equations and theorems I_{c} =...

Hi what type of calculation errors should i do for my data on the capacitance discharge experiment. I had a voltage of 1.5V ,and I know the resistance, so the aim was to obtain the value of the capacitor, using the time constant RC=t formula. I done 4 trials , with the same voltage, (...

I'm trying to figure out what I would need to do in order to make something that could quickly store/build up energy and then disperse it completely once the build up was complete; within a few seconds passing. I'm not really looking for the quantity of energy at the moment but more of the speed...

Pls tell me why is it easier for a capacitor to discharge rather than charge.?

Homework Statement A cube of gold (resistivity ρR = 2.44 10-8 Ω m, density ρD = 1.93 104 kg / m3, and specific heat c = 129 J / kg °C) that is 3.5 mm on a side is connected across the terminals of a 40-µF capacitor that initially has a potential difference of 340.0 V between its plates...

Homework Statement Determine how long it takes the capacitor to discharge to a value of 3v C=1.5E-6F R=1E3ohms Vi=25v Vf=3v Homework Equations T=RC v=Vi*e^(t/T) The Attempt at a Solution T=1000*1.5E-6 T=1.5E-3s Vf(3v) is 12% of the initial 25v Im having trouble...

Hello, I'm an undergraduate student, doing an independent research project under a professor this summer. So the experiment I am working on involves using a glow discharge tube, with electrodes at two ends, to create and contain a plasma column. The purpose is to measure and analyze "wave...

Homework Statement A fully charged capacitor is connected in a closed circuit with nothing else in the circuit. So the capacitor starts discharging.At a certain instant of time the charge on the capacitor is reducing at the rate of 5 micro coulomb per second(dq/dt =5 μC per s). What is the...

Hey, I am back, you might remember me from the reactance topic, anyway I managed to get there in the end, only due to you guys. Thanks for that. This time its something slightly easier.. In an AC circuit, once the capacitor is fully charged, and the voltage switches direction, from that...

Can anyone please explain to me why in a RL circuit, using higher values for resistance will shorten the transient response in the inductor? I've read and found a site claiming that it "reduces the amount of energy the inductor can store", can anyone expand on this a little?

Homework Statement Discharge time from battery if you have a pump drawing 4.4 amps with 12 volts dc and a light drawing 0.0545 amps with 110 volts (ac). Battery at max has specs: 12 volts, 144 watt hour, 12 amp hour. Homework Equations I'm not sure if you're able to add up the...

Hello everyone, I know this may be a very elementary question but I'm not an EE or have access to one other that this forum. I've been reading up on capacitors and so far I'm not able to decipher if a cap will discharge only if the capacitor has reached its maximum capacity. I would think...

3-pin (Gas Discharge Tube) Surge arrester rating "DC spark over voltage" Could someone please help with a question about Gas Discharge tube, surge arresters rating? I am looking at a public address audio equipment which uses a 100vrms audio lines driven from a audio transformer. Currently...

I don't understand how exactly ESD mats work. They prevent build up of Electrostatic charge. So any non-wool material would qualify as an ESD mat? Do ESD mats also help discharge an already build up ESD, like a person clothed in sweater and charged up to couple of Kilovolts?

If I have some increased electric charge in some material which is surrounded by dielectric, what could be a way to discharge it?Let`s say, I can`t penetrate a dielectric with grounded metal probe.

Lately I have had an idea for a propulsion system. It would use rapid high voltage electrical discharges to create thrust. Now if it was strong enough and made correctly could this be an efficient form of thrust? Would it work?

Hello everyone, Vasomotor centre for example, increases heart rate and increases blood vessel constriction and raises total peripheral resistance. The end result is increase in stroke volume. My question is if blood pressure is raised too much by constricting blood vessels, wouldn't that make...

inductor can discharge or not?

hi, does anybody know how much pressure there is inside a discharge tube?

I posted someones answer here, with my questions regarding it at the end. The answer you see under this sentence was made in response to my question. Please read this answer and answer my questions at the end of it. 1. Let us try an analyze this statement. You mentioned three "buzz words"...

Hi all, I was thinking about measuring the temperature of an arc discharge. The size of the discharge is very small, in the order of micrometer. So it is not possible to put a thermocouple near the it. Thank you very much.

This is an old saying that always annoys me! People swear by it but I just don't see how it can be unless the theory has been distorted over the years. Could it be that just the coldness of the floor weakens the battery? As it goes if you put a car battery on a cement floor it will discharge...

Ok so i am just trying to clarify a few points about capacitor charge, discharge, i was wondering if anyone could help. 1)In charging, am i right in thinking current decreases exponentially, charge increases exponentially, and voltage increases exponentially.? 3) Am i write in thinking in...

The discharge of irrigation gate is q=Cd.W.L.sqrt[2g{h1-h2}] where q is the discharge of gate which is veriable value(dq/dt),Cd discharge constant,W is width of gate(constant value),L is opening gate control which is variable value(dL/dt),g is gravity constant,h1&h2 is up and downstream of...

I have a quick question. part of one of my questions asks "Find the rate at which thermal energy is produced in a resistor" i havn't included the whole question because i don't think it matters, its just like the last part of it so we have...

Homework Statement When a condenser discharges electricity, the instantaneous rate of change of the voltage is proportional to the voltage in the condenser. Suppose you have a discharging condenser and the instantaneous rate of change of the voltage is 1/100 of the voltage (in volts per...

When a capacitor discharges, the potential difference between its plates and the resistor's terminals is the same. Hence, \frac{Q}{C}=R \frac{dq}{dt} Solving this equation we get q(t)= Q_{0} exp \frac{t}{RC} Obviously, this isn't the solution. It is actually q(t)= Q_0 exp...

Hi, I experimented with a hydrogen tube and after some time the emission stopped.could it be because all hydrogen atoms became completely ionized?

Homework Statement In an RC discharge circuit, R= 2.5 X10^4 ohms and C=40 microfarad. The initial potential difference across C is 25 V. Find the rate at which energy is being lost by C at 0.5 seconds. Homework Equations The Attempt at a Solution Like in this case, I probably have...

I am designing an electric vehicle and choosing the batteries. For this i want to model some inefficiencys into the batteries. I came across the formulae T=C/I^n where T=battery life C = capacitence I= current n= Peukert's number would 1.1 for n be ok for lithium ion, it seems to take quite...