Discharge Definition and 268 Threads

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. 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
  2. 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?
  3. 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...
  4. 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...
  5. Plat

    X-ray production - maximum pressure

    What is the maximum practical or theoretical pressure at which x-rays can be produced, as in a Crookes tube or cathode ray tube? I know Crookes tubes operate at 0.1pa and lower, but I need to know if I am at risk of producing x-rays with high voltage (60kv+) discharges at medium vacuum, as low...
  6. A

    Best time interval for measuring capacitor discharge?

    Homework Statement My (practise) coursework is to test the equation 'V = Vo e-t/RC' and choose values of R and C so that the voltage across the capacitor falls to half in 15 seconds. I decided it would be too difficult and inaccurate to record the voltage across the capacitor every 5 seconds...
  7. J

    Electrostatic discharge without dielectric breakdown?

    I saw an experiment the other day, where a van de graaf generator charges up this big smooth chrome sphere. There is a "wand" with a much smaller sphere nearby that's grounded, and periodically a spark can be heard and seen when the big sphere dischrages to the wand, which corresponds to...
  8. M

    Calculating Energy Transferred in Lightning Flashes & Thunderstorms

    Homework Statement (a) It is estimated that the average electric charge carried in a lightning flash is 5C. If the p.d. between the cloud and the ground is about 800 MV, approximately how much energy is transferred in a flash? (b) In a typical thunderstorm, lightning flashes strike the ground...
  9. N

    Electrostatic discharge current

    I understand that electrically charged objects such as a rubber balloon or even the human body can hold several thousands of volts. What's troubling me is that I know the current that results from an electrostatic discharge is not enough to cause serious damage or kill a human, yet if you touch...
  10. F

    Earth, its charge, its potential and how objects discharge....

    Hello Forum, When we take a small metal sphere of radius R1 an charge Q1= 1C and a larger metal sphere with R2=20*R1 and charge Q2=-2C. The spheres are initially separated. Being conductors, all the charge resides on the surface of the spheres. Sphere 1 has an electric potential V_1 (relative...
  11. S

    Deriving the equation for capacitor discharge

    We have a circuit consisting of a charged capacitor and a resistor. First of all, we use Kirchhoff's loop rule to express this circuit in mathematical form. Now one teacher tells me Kirchhoff's loop rule yields iR+q/c=0. Another teacher tells me that the rule yields iR-q/c=0. Is there any...
  12. C

    Calculating Final Voltage in Capacitor Discharge: What Could be Wrong?

    Hi All, (First post, be nice). I'm analysing the discharge of a capacitor. Starting from the energy in a capacitor: E = \frac{1}{2} CV^2 This can be represented as follows (seen this elsewhere, there is nothing wrong with this): \Delta E = P \Delta t = \frac{1}{2} C(V^2_s-V^2_f) Where \Delta...
  13. G

    Question for grounding of the electronics to Faraday cage

    Hello. Let's say there is a instrument needed to be EM wave-shielded in High voltage discharge lab. Building Faraday cage becomes necessary and the instrument is moved to inside the cage. The cage is grounded to lab ground and the frame ground of the instrument (it is also signal ground for the...
  14. H

    Understanding Discharge: Where Does Capacitor Charge Go?

    Homework Statement When a capacitor is discharged, where does the charge "go back to"? Explain. Homework EquationsThe Attempt at a Solution I know that the charge goes from positive to negative, but I do not know how to explain this.
  15. R

    Capacitor Discharge: A Simple Explanation

    Could someone explain to me how a capacitor discharges through another capacitor of different capacitance. Why does the voltage on the second capacitor have to equal the voltage on the first capacitor after the discharge. Please explain the concept to me in simple terms, do not go into...
  16. L

    What Causes ESD Discharge While Handling Components and Assembled Units?

    What are the conditions when a ESD discharge occurs, in particular while handling components and assembled units. Can someone explain ESD discharge in the following cases - Let's say you are handling an IC, moving it around for soldering etc. What is the chance of the handler zapping the IC and...
  17. J

    Why does my hand create a static discharge when I touch a metal object?

    Dear all, I would like to ask you to explain me this question on physical (chemical) level. Question is: Why static electrical charge is moving when I press and move my hand on rug and then catch a piece of iron, which is not gorunded? According to my knowledge, iron atoms had not strong...
  18. C

    Discharge of a Capacitor in a Magnetic Field: What Happens to the Momentum?

    Homework Statement A charged parallel plate capacitor with plates in the x-y plane and uniform electric field ##\mathbf E = E\hat z## is placed in a uniform magnetic field ##\mathbf B = B \hat x## i) A resistive wire is connected between the plates in the ##\hat z## direction, so that the...
  19. Hijaz Aslam

    Charging and Discharging of two capacitors

    Two capacitors with different capacitance are charged with two different voltages. When we connect both the capacitors with the similar terminals (that is positive terminal of one capacitor to the positive terminal of the other and vice-versa) the net charge is the sum of the former individual...
  20. G

    Li-ion Discharge Rates: Answers to DIY Battery Jump Starter Questions

    More of a general question but thought I'd post it here. Motorcycles are notorious for losing battery charge and not starting requiring a jump or rolling start. Was looking to get one of these new Li-ion battery / jump start modules capable of starting a car (and charging a phone or tablet)...
  21. davidbenari

    How exactly does a capacitor discharge?

    I've been asked to do an electric bug swatter in class, and several questions have come up to my mind. Whenever two rackets (each connected to a different terminal on the capacitor) touched, a spark emerged. This spark is supposedly ionised gas, which makes sense. But why do people say that...
  22. AdityaDev

    How can I charge my capacitor bank without a 330v DC power supply?

    I have a capacitor bank (20x 330v 180uF capacitors in parallel). But i don't have 330v DC power supply to charge the capacitors to 330 volts. I tried using a 13.7v supply from an AC adapter, but the capacitors got charged only to 13.7v. What should i do for this?Should i use another capacitor...
  23. M

    Formation of Excimer Structures: Explained for Engineers

    Reposting from another section... Can anyone explain to me how an excimer is formed? Like structure wise? Considering Xenon. I've gathered that an excited state Xe*, ground state Xe, and a 3rd body M react resulting in an Xe* excimer + M(carrying away excess energy). I'm struggling to find...
  24. M

    Forming an Excimer - Explaining the Process for Xenon

    Hello, first post! Can anyone explain to me how an excimer is formed? Considering Xenon. I've gathered that an excited state Xe*, ground state Xe, and a 3rd body M react resulting in an Xe* excimer + M(carrying away excess energy). I'm struggling to find how the ground state Xe can have any...
  25. E

    Fundamental capacitor discharge question

    Hi All, I understand that when a capacitor is subjected to a DC voltage, it stores charge. However, when the DC voltage is removed (open circuit) why does the capacitor not internally discharge? Shouldn't the charge just go back to where it was, leaving the capacitor with 0 stored charge? I am...
  26. N

    Thunderstorm Discharge modeled as Electric Dipole

    Homework Statement An electric dipole with -q at the clouds of height h, and +q beneath the surface with height -h. Given q=200 C, and h=6000m Electric discharge occurs with electric field of 3000 V/m near ground level, and 200 V/m above the clouds. Find the ranges where discharges are...
  27. A

    Electrostatic discharge and metal rods

    I uploaded a photo to help explain the question, basically the blue rod is a -ve charged rod ( high voltage) gray one is metal and the brown is also metal but it's grounded , if gap A and B are filled with air , the high voltage will break down the air in both gaps and make 2 sparks in both gaps...
  28. N

    Would a battery pack phone charger case discharge your phone faster?

    So supposedly if you leave your phone plugged into a charger but the charger is not pluged into anything then it will discharge your phone faster, so if the charger cases have a charger connector constantly in your phone will it actually discharge it?
  29. M

    Understanding RC Capacitor Discharge Theory

    Homework Statement This is not a true homework problem but rather my interpretation of RC Capacitor theory. What is the action of a capacitor in RC first-order circuits?Homework Equations The Attempt at a Solution From what i understand, when a capacitor is being charged, charges move from...
  30. I

    Charge or Discharge: Calculating Current with i(t)=Vth/RTh

    http://photouploads.com/images/zxwx.png Why are they using the i(t) = Vth/RTh ... formula to work out the current? I mean in the image on the right (in the above link), the inductor is de-energising through the resistors so why are they using an equation that is used when energising?
  31. T

    RC circuit, discharge with digital signal from FPGA

    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...
  32. N

    Discharge circuit in electric vehicle

    we are designing a electric car. in that motor controller has capacitors which get charged when supply is given.so across the contactor we are attaching a precharge resistor,which prevents the hiigh inrush of current in motor controller. now we are stuck on the ques that how to discharge the...
  33. AJKing

    How do you safely discharge a capacitor?

    I hear of people discharging them with screwdrivers, but is that the best call for 10000+μF capacitors?
  34. PhysicoRaj

    Experimenting with Capacitor Discharge Arcs: What's Going On?

    Hi there.. I was experimenting with capacitor discharge arcs. I charged a 340μF cap to 9v and shorted the terminals of the cap. Zap! Sparks!.. Then the terminals got stuck to each other as if they had been glued together! It took me 3-4 seconds pulling at them to separate them. It happens every...
  35. K

    Explain my capacitor discharge math discrepancy

    I'm trying to cross check mathematically the mA being discharged from a .33uF capacitor which is charged to about 1200V by a circuit (see single_circuit.jpg) which is provided 37W of power to it. I do it three ways. 1) The circuit draws 35W total. 13V @ 5A = 65W. But the power supply drops...
  36. U

    Emission from hydrogen discharge tube

    Homework Statement In a lab experiment on emission from atomic hydrogen in a discharge tube only a small number of lines are observed whereas a large number of lines are present in the hydrogen spectrum of a star. Why? The Attempt at a Solution I think it is related to temperatue but I...
  37. Q

    Pneumatic Cylinder Discharge Equations

    Hi all, First post here and I hope that somebody can help. I'm using Simulink/Simscape to model discharge of gas from a constant volume, pneumatic, pressurised cylinder. No heat exchange with surroundings yet. I have got the equations matching the stock models from AMESim and Simscape for...
  38. A

    Electrical Discharge in Argon: Which Electrode is Bombarded?

    In an environment of Argon between two electrodes at a distance about 2 millimeter a current is discharged of about 19 amps and 30 volt DC. Which electrode get bombarded with the ion to dislodge particles of the surface ?
  39. Steven Ellet

    Will a Glass Ball Discharge in an Insulator?

    For example, if I negative charge a glass ball and put it into a rubber (or any insulator) case to shield it from being grounded, will it discharge on its own? I know that a capacitor will discharge with time( assuming that there is no input.)
  40. T

    Transistor connection in the discharge path of the 555 timer

    http://www.slideshare.net/viv3ksharma/automatic-school-bell In this circuit I Think the emitter and collector terminal of the transistors T1 & T2 will be reverse. Otherwise the 555 timer will not discharge. Can anyone help pls?
  41. T

    Connection of the transistor in the discharge path betn 7 & 6 of 555

    In an automatic school bell circuit, The outputs from 3 to 11 are connected to the base of an NPN (BC547) transistor through 1K resistance. A diode is connected in forward bias in each of those outputs so that only one output sends high pulse to the base of the transistor. When the high pulse is...
  42. P

    How does a discharge UV lamp works

    I think i have looked at like 20-30 web pages, and i can't find a simple step-by-step explanation of the operational principle. I know, that when a rare gas like Helium, relaxes from an excited state two characteristic emission lines occur. But how do you excite the gas in the first place...
  43. B

    Total Energy of a Particle After Discharging a Photon in a Moving Frame

    Homework Statement A particle of mass m is at rest in the lab frame. The particle discharge a photon with energy 1/2mc^2 to the direction of x+. A spaceship is moving at v = 0.8c in the direction x+ (in the same direction the photon is moving). What is the total energy of the particle after it...
  44. B

    Understanding Battery Discharge & Peukert's Law

    Homework Statement i have to do a scientific research about finding the best batteries specifications. for this case the battery should last long as possible . there are 3 characteristics : Voltage , Capacity and inner resistance . i have measured voltage over the time. when i used smaller...
  45. jaumzaum

    Difference between Corona Discharge and Dielectric Breakdown?

    What's the difference between Corona Discharge and Dielectric Breakdown? For me both stand for the same process, but wikipedia (as many other sites) says they are different. Actually they say corona discharge occurs when the electric gradient is high but not enough to create an electrical...
  46. A

    How long it takes to discharge capacitor when switch is opened

    Homework Statement Please look at the attachment. The part I am having problems with is part C Homework Equations time constant = RC Q = Q0 e^(-t/RC) The Attempt at a Solution I don't understand why the circuit is equivalent to the 4 ohm resister with the 18 ohm resistor in series so that...
  47. M

    Gas Turbine Engine Compressor Discharge Air Temperature Calculation

    Is this gas turbine engine compressor discharge air temperature calculation relatively accurate? Problem: Calculate the compressor discharge air temperature in ºF of the following gas turbine engine compressor core specifications. Gas Turbine Engine Compressor Core Specifications...
  48. D

    Engineering RC Circuit Discharge Conceptual Question

    http://i.imgur.com/ZCcaZpq.png I have the solution manual, so this is more just a question of why, rather than what. I understand that with the switch open: vA = 3v vB = vC = 0v i0 = 0.25 mA When the switch closes it creates a short that makes the two 6kΩ resistors irrelevant...
  49. S

    How to discharge a clear plastic film roll ? : (

    Hello ! Firstly, i'd like to say that I have nothing to do with physics - and everything I've learned in school - has been forgotten and I really hope you can help me with a small problem I have .. I bought a roll of clear plastic film (100 m) one like this...
  50. P

    Can Corona Discharge Occur Around Charged Glass/Dielectric?

    ...Considering there is NO dielectric breakdown or breaking of glass/dielectric..... Can there be a corona discharge ever around a charged glass/dielectric without a conductor in the vicinity? For instance; take a single-electrode glass high-vacuum tube, charge it to high voltage...
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