What is Discharge: Definition and 264 Discussions

A military discharge is given when a member of the armed forces is released from their obligation to serve. Each country's military has different types of discharge. They are generally based on whether the person completed their training and then fully and satisfactorily completed their term of service. Other types of discharge are based on factors such as the quality of the person's service, whether their service had to be ended prematurely due to humanitarian or medical reasons, whether the person had been found to have drug or alcohol dependency issues and whether they were complying with treatment and counseling, or whether the person had demerits or punishments for infractions or were convicted of any crimes. These factors affect whether they will be asked or allowed to re-enlist and whether they qualify for benefits after their discharge.

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  1. S

    B Coloured beam in a discharge tube

    Why cathode rays which consist of electron that do not have any colour are seen as a colourful ray of light in a discharge tube??
  2. D

    Making Capacitance the subject of discharge equation

    Homework Statement I have to rearrange the equation V=lnVo -t/RC to calculate C. The gradient from graph = -1/RC Homework EquationsThe Attempt at a Solution I got R/C=ln(Vo-V)/t but the answer I get is wrong
  3. K

    Method for testing discharge resistors in 3 phase capacitors

    A couple of months ago I was troubleshooting a blown fuse on a power factor correction capacitor in a 4160v motor starter. While I was working through it I noticed that my DMM (fluke 289) would charge the capacitor to a certain degree while on the Ω function. The current from the meter would...
  4. Casper Hansen

    Partial discharge material limiting values

    Hi PF According to IEC 60885-2 and IEC 60270 the acceptance criteria in partial discharge (PD) measurements on high voltage cable insulation state that PD level should be below (< 5 pC). The insulation material that is refereed to is often XLPE which is a sensitive insulation to PD. Other...
  5. F

    Discharge in a DC RC circuit and Kirchhoff's Loop Rule

    Hi all, I think this issue periodically resurfaces in PF. I have found a similar discussion in this closed post and possibly others. I'm posting this because I'd like to check my understanding, if anyone is available to provide some furtherinsight. So I'm trying to gather a "overall"...
  6. R

    Plasma Generation using Dielectric Barrier Discharge

    I am having trouble in making a power source for the DBD. I can't seem to find any calculations to get the required voltage and frequency of AC to generate plasma. I want to know the circuit/method/equipment needed to generate that voltage from a normal 220 V/50 Hz AC socket in my lab.I am doing...
  7. T

    Suction side and discharge side pump pressure

    Consider a closed system (central heating). Before the pump is started the static pressure is 2.0 bars. Say the system head loss is 0.6 bars. When the pump starts, will the suction side pressure and the discharge pressure each read half the total head loss (1.7 and 2.3 bars)? Or will the head...
  8. M

    Mechanism of discharge in DBD? (dieletric barrier discharge)

    Hallo all, I'm investigating in using a dieletric barrier discharge for gas treatment, if I have two electrodes isolated by dieletric and the discharge gap between both of them has AIR.. how the ionization of air will take place, from where the source of electron which is going to start the...
  9. B

    Types of energy in a gas discharge tube

    I am reading about gas discharge tubes and can't work out the types of energy and energy conversion that occurs in a gas discharge tube. Initially before the tube is switched on you have an inert gas with kinetic energy. As soon as the tube is switched on there is an an electric field between...
  10. J

    Heathkit Model CP 1060 Capacitive Discharge Ignition

    One of my transistor has failed I tried replacing but sticking any transistor in there does not seem to work. Someone from that worked for Heathkit told just look up number this would work except I can not find cross for 230-616. When this unit worked it always put a little wine out I think it...
  11. H

    Capacitor circuit time constant problem

    Homework Statement How long does it take in time constants ( = RC) for the charge on the capacitor in the circuit shown below to reach one quarter its initial value? Homework Equations C=Q/V time constant=RC Vc = Vo * (e)^(-t/RC) The Attempt at a Solution From C=Q/V I get Q=VC so for the...
  12. C

    Capacitor discharge vs. Pole relaxation

    I'm trying to understand the difference between these two when it comes to measuring the amount of time they take. As of right now, my current understanding is that pole relaxation is based on the amount of time that it takes for polarization of the charges to go back to its relaxed state. For...
  13. T

    Compressing a gas above compressor's discharge pressure

    A 2 stage compressor has a final delivery/discharge pressure of 250 bar. hydrogen is been compressed and stored in vessels. The pressure in the storage vessel reaches the delivery pressure(i.e.250 bar) and the compressor is still running ( vessel has a safety pressure of 450 bar) and the...
  14. S

    How do planes discharge static electricity when refuelling?

    I know that planes have static dischargers (static wicks) on the trailing edges of wings to discharge static electricity when they are flying. I was wondering how a plane, let's say with electrically resistive fibreglass wings, would discharge this without having sparks ignite while it's...
  15. H

    Partially closed pump discharge valve question

    Hi all, I have a question about the effect of partially closing a pump discharge valve on the system curve, wondering if you guys can help me out. Right now I have the yellow pump curve and the orange 2 inch system curve , producing around 120 gpm against around 110 ft of head. If I expand...
  16. G

    Humidity & Discharge: Molecular Mechanism & Role of Polarity

    It is known that increased humidity helps discharge a charged body. I was wondering what is the molecular mechanism of that process. It is not clear to me why increased number of well separated uncharged water molecules in the air will help the process of discharge. Does the polarity of water...
  17. Y

    Why Does My RL Circuit Analysis Yield a Positive Time Constant?

    Homework Statement After a long time, an inductor is disconnected quickly from the battery and then attatched to a resistor. Homework Equations V = Ldi/dt V = ir The Attempt at a Solution KVL: voltage across inductor - voltage across resistor = 0 Ldi/dt - ir = 0 di/i = rdt/L ln|i| from i(t)...
  18. Y

    Can't we use dq/dt in RC discharge?

    In the derivation of discharging RC circuit, you use I = -dq/dt to get Q = Q0 e-t/RC But isn't dq/dt already implied to be negative, since charge on the capacitor is decreasing, and you force it to be negative using initial nd final conditions? So the final state is some low charge q, and the...
  19. chikou24i

    I Discharge voltage of materials for Li-Ion batteries

    What do we mean by a discharge voltage of a material ? and is it good to have a low one or a high one ? Thank you.
  20. C

    How to choose the discharge time of a rechargeable battery

    I am working on a project which involves rechargeable batteries. To calculate the variations in the internal resistance of the battery, i used data from the existing experimental results to establish an approximate value for the internal resistance as a function of the SOC, discharge time and...
  21. J

    Faraday Cage and a high voltage discharge arc

    In the following video: I understand how the Faraday Cage works, but what has me confused is the arching. If charge is building up on the sphere and then arching over to the cage, where then is that charge sunk to? You would think it would stop arching when there was sufficient charge on the...
  22. chikou24i

    Pulse current discharge test of a Li-ion

    Could someone please explain to me what is the definition of a pulse current discharge, and what do we mean by pulse current discharge test ?
  23. S

    Discharge of a capacitor through a common ground

    Let's say a switch causes a capacitor to charge and the switch opening causes the capacitor to discharge from its positive plate through a common ground to its negative plate. This common ground is connected to other components, if there is a difference in potential in other components to the...
  24. Ravikant Rajan

    Derivation of discharge over rectangular weir

    How does the velocity at an elemental height h equates to √(2gh)? My application of Bernoulli's equation is not yielding the result. Please show the process. Thank you
  25. M

    Relationship of discharge and minor loss coefficient

    What is relationship between discharge coefficient and minor loss coefficient. Am I right with that equations? hl – minor head loss k – minor loss coefficient ρ – air density A – pipe cross section area Cd – discharge coefficient Δp – pressure drop u – air velocity m – mass flow here is...
  26. Y

    Discharging High Capacitance (6F @ 48v)

    This is my first post and am curious if anybody here has any experience or advice on how to discharge a capacitor bank with 6 1F capacitors connected in parallel. I built a electric hybrid (basically electric transmission) vehicle that uses a 31hp gas engine to power a 23kW (peak) DC generator...
  27. B

    Illuminating a Thyratron (mercury gas discharge)

    I found a thyratron tube at a yard sale recently and I want to build a circuit to heat the filament and illuminate the mercury vapor for purposes of building a novelty lamp. The filament is just 2.5VDC at 7 amps and I have a transformer for that. To light the vapor I will apply DC rectified...
  28. smokingwheels

    Mylar sheet, 1 sq foot charged to 20 KV, clap to discharge

    Please delete if not allowed. The teacher charged a 1 square foot sheet of mylar sheet up to approx DC 20 kv one day long ago in school via an modified EHT output of a TV. I had one of my mates hold it by the corners in line with my hands, I then judged and guessed and clapped it with both...
  29. R

    Keep setting fire to discharge load resistor - Wattage limit

    We kept getting some voltage spikes back into our amplifier. One of the things we put in place is a 10kOhm resistor (discharge load) connected to the output of the amplifier. However, the resistor keeps burning and setting on fire. The amp company offered a way on checking this... I'm really...
  30. mfig

    How can I design a spark ignition system with a wider energy delivery range?

    Hello, I would like to design a spark ignition system with a wider range of energy delivery than a typical MSD system. On the MSD systems I have looked at, they are limited to about a 10 mJ range, but I need to go from, say 5 mJ to 1 J if possible. Does anyone know of a packaged system like...
  31. G

    Why can a capacitor get discharged through a (long) cable?

    Hi. If a plate capacitor is charged with some charge ##Q##, then there's a voltage ##U=Q/C## between the plates. The electric field between the plates is ##E=U/d##. Voltage is path independent, if I connect the plates with a cable of length ##l\gg d## the voltage across the cable is the same...
  32. A

    How Can I Calculate Battery Discharge Time Using a Formula?

    Hi guys! For a school experiment we are supposed to connect a 9v battery to a 180 ohm resistor and multimeter and calculate how long it take to die at different temperatures . does anyone know how can i do this using a formula? I will need it in my report. Thanks for the help! :)
  33. hackhard

    Fully discharge a metal plate?

    is there any way to fully neutralize a charged metal plate ? connecting it to metal body of relatively huge capacitance will make its charge negligible but not zero? is there any other way?
  34. G

    Discharge only one plate of a capacitor?

    Hi. Assume we connect both plates of a capacitor to ground and disconnect again, leaving them at ground potential. Then we bring electrons from one plate to the other, until there is a voltage difference ##\Delta U## between the plates. Compared to ground, one plate has the potential...
  35. G Cooke

    Corona discharge current formula

    I'm trying to find a formula for the current flowing through a wire that is only undergoing corona discharge into air. The wire is connected to a charged sphere, which provides the voltage. So far, I've just found formulas for certain ionization coefficients and electric fields, but no current...
  36. M

    Relation between Headloss Coefficient and Discharge Coefficient

    Hi Have a look at this formula: Cv=((39.693*D^4)/K)^0.5 It correlates Discharge Coefficient (Cv) for a valve with Headloss coefficient (K) of the valve. Please explain this formula and let me know: 1- Is K fixed for a valve in every situations of it? 2- Assume an area of a valve is changed...
  37. A

    I Help with Experiment on Batteries

    Hi guys! I am currently having Physics Internal Assessment in my school and I want to do an experiment to calculate the different times it takes for a 9V cell to to discharge (reach a 0.1V) in different temperatures. The problem I am having right now is to efficiently discharge my cell. How can...
  38. Parsifal1

    Calculate discharge in L/s and Kg/s

    Homework Statement A tank contains oil with a specific gravity of 0.80, which is discharged through a 30mm diameter pipe at 12m/s. Calculate the discharge in L/s and Kg/s. Homework Equations specific gravity=density of oil/density of water mass flow rate=volume flow rate*density volume flow...
  39. F

    Fluid discharge from pipe to atmosphere

    Homework Statement I know that when the fluid flow from pipe to reservoir, the coefficient of discahrge is 1, where head loss =k(v^2)/2g... How about the fluid is discharged from pipe to atmosphere?? Homework EquationsThe Attempt at a Solution
  40. M

    Principle of a positive corona discharge?

    Homework Statement So as I understand, a negative Corona discharge happens between an electrode/pin/rod and a plane electrode. When the sharper electrode is connected to the negative (DC) plug, electrons concentrate on the tip, when sufficient breakthrough voltage is achieved a discharge...
  41. M

    Discharge Coefficient of Valve equation

    I have a problem with Discharge Coefficient of Valve equation which is described in book 'advanced water distribution modeling and management' let me say: I think the expression V^2 in Discharge Equation (P. 618 of the book mentioned) is extra and the equation must be changed to: I)...
  42. Paul Colby

    A Why are low pressure gas discharge lamps thermal sources?

    When an atom makes a single photon transition it adds a single photon to the radiation field. One might then expect that a low pressure gas discharge would emit photons in Fock states? How is it that photon of an atomic spectral line produced in a low pressure gas discharge become thermalized?
  43. F

    Loss of head at submerged discharge

    Homework Statement in the notes , author said that the velocity within it is negligible? does the author mean the water velocity in the tank ? so the velocity (v^2)/2g in the 4.24 means the velocity in the pipe ? Homework EquationsThe Attempt at a Solution
  44. NickTesla

    Capacitor Discharge Time Formula Euler

    I would like to understand how the Euler constant elevated to fractional exponent gave this result? 958mV someone please!?
  45. Y

    Why does a capacitor discharge slowly?

    Homework Statement Explain why a capacitor will discharge, although very slowly when there is high internal resistance? Homework Equations V=IR Q=V/C The Attempt at a Solution I am confused slightly by internal resistnace. Does that refer to regular resistance. From that high internal...
  46. vinamas

    Pipe Discharge and Diameter

    Homework Statement An engineer is planning for a network of pipes to a residential tower containing 360 apartments each one of them consumes 0.05 liters/s of water what is the least possible pipe discharge for the main pipe in the network if the fastest speed of discharge in the pipe is 4m/s...
  47. W

    What is the coefficient of discharge and why is it important?

    Homework Statement why the author consider the coefficient of discharge as the z here ? what is exactly coefficient of discharge? Homework EquationsThe Attempt at a Solution
  48. S

    Electric Discharge acts as in LC Circuits?

    For the most part, do electric discharges behave as tank circuits? For example, an air capacitor; when the electric field causes the air to breakdown and conduct, will the discharge alternate at a frequency defined by the inductance of the plasma channel and the capacitance of the capacitor?
  49. Plat

    Radiation or electrical interference? Geiger counter

    First, I hope this is the correct place for this question. I am experimenting with electrical discharges at low pressure, think plasma globe, and I bought a geiger counter to make sure I am not producing x-rays. My vacuum pump is rated down to 5 pascals. The problem is that the geiger counter...
  50. Plat

    Striations in cathode ray discharge

    What causes these striations? How does the voltage and pressure of the discharge affect the size, color, number, and spacing of the striations? I have produced a discharge with striations with fairly low voltage (under 15kv) and pressure 10 - 100pa, and the striations are very thin, compact, and...
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