Capacitor Charging & Discharging

[H1TM4NB00THY]

That looks like a 160,000 Mega Farrad Capacitor to me...

[msdaif]

@H1TM4NB00THY no micro farad.

[H1TM4NB00THY]

@msdaif Yes. sorry I was mistaken. MFD = μ.

[MrFunyman1234]

i got 4 400v 22uF capacitors and wireled them all together CORRECTLY and i got 400v;s out for 5 hours >:D

[thefuzzyhoney]

So sorry prof.. The discharge phase for I(A) is wrong. Since current is an opposite of charge the phase is suppose in the other side, the - I(A)..

[edumation]

@thefuzzyhoney You are 100% right. The current is -ve during discharging because it flows out of the postive terminal of the capacitor. However, I showed how the current decays regardless of the previous state.

[gjmvi]

How do you know when it is done charging?

[edumation]

@gjmvi When lamp goes off

[wildmejowild]

in drawing current and voltage graphs, it would be less ambiguous if you chose diferent starting values.



[ConnorXV]

Watch my video 'how to make the 400v charging circuit / module' from just 4 components, for charging photo flash capacitors in coilguns and other things.

[ConnorXV]

Watch my video to learn how to make a circuit from scratch capable of charging a 400v capacitor for coilguns etc, using only a 1.5v battery, you just need four components and little knowledge about circuitry, it should be comprehensible.

the video is called ' how to make a 400v charging circuit '

[vdnguyen88]

Very nice!

[Techrave1]

Hehe now for an emp :p

[Iseekoutthetruth]

is there any other way to charge a capacitor with out using a battery or power supply?

[Iseekoutthetruth]

can a micro phonic capacitor charge a 12 volt battery? and keep it charged?

[Iseekoutthetruth]

can a capacitor charge a 12 volt battery? and keep maintaining the charge?

[edumation]

@Iseekoutthetruth

[edumation]

@Iseekoutthetruth it can if the battery size i small

[TsukiRockerBoy]

What are those red and black clamps that you used to connect the power source to the capacitor called?

[msdaif]

@TsukiRockerBoy Called ''Aligator clips'' which are metal connectors to conduct electricity from the wires to the terminals of the capacitor

[TsukiRockerBoy]

@msdaif Oh yeah, that's right! Thanks! I was gonna buy some online, but I couldn't remember the name for it.

[Bearz314]

@msdaif Or.. crocodile clip :)

[1world1love2day]

@TsukiRockerBoy also called jumper cables

[shades2]

Ah, the bountiful harvest of old T.V. sets...

[Biohazard000Labs]

so Capacitors is like a battery? =D

[msdaif]

@Biohazard000Labs Yes, a temporary battery

[xenoepist]

@Biohazard000Labs Capacitors can work as a battery, but that is not what they are mainly used for since they discharge very quickly. I'm not sure but, I've heard that they are working on a new type of capacitor that can hold their charge better, thou. Most of the times they are used as a filter for low frequencies.

[YmeStingWrestler1]

holy shit that is big

[cacneaunit6]

I have a shitty multimeter, capacitors,a will to make a coilgun and no knowledge how th fuck a capacitor works, how to charge a capacitor safely and I have no idea WTF a mf of uf is plz help

[tiredfingers99]

The current decreases as the voltage increases and the capacitor charges?

[tiredfingers99]

The current decreases as the voltage increases and the capacitor charges?

[algs229635]

Thank you ,for sharing, greetings from Brasil

[GREENG0037]

how do i charg a 35v 4700 uf capacitor with it not blowing up. i only have a 6 volt battery

[edumation]

@GREENG0037 USE any power source not exceeding 35V

[happygamestvfun1]

do you like your job?

[blackhawkfan54]

I have two filter capacitors with their positive terminals tied together in parallel in a video game power supply that need to be discharged for replacing. One is a 55,000 microfarad 25v and one is a 100,000 microfarad 16v.

Is the 6v lamp circuit you used in your video adequate for this? If not what do you suggest that I use in order to safely discharge this pair of capacitors? Thanks in advance.

Is it safe to unscrew the capacitors from their terminals, assuming they are fully charged?

[edumation]

@blackhawkfan54 It is dangerous to touch them by bare hands. Procedure: 1. Wait a few minutes until the capacitor discharges 2. Wear gloves 3. Use a resistor or a lamp and connect it across the terminals.The rating of the lamp is the charging voltage of the capacitor

[Rahulpariyar]

sir, how long will a capacitor take to dischrge if it is attached to a mobile...how many capacotors need to be attached in order keep the mobile on for minimum 5 minutes??

[msdaif]

@Rahulpariyar As it says in the video, the total discharge time is 5xRXC. So it depends on capacitance and resistance. The bigger the capacitor, the longer it takes to discharge.

[ibanezman007]

This guy sounds like that guy from ferris beulers day off. The one that always talks in a monotone.

[SerMarelli]

can a motor work at the same way the light is working in this experiment?

i tried to make a motor run with a charged capacitor, but it doesn't work, why?

[msdaif]

@SerMarelli

What was the type of motor and the type of capacitor?

[SerMarelli]

@msdaif

it is a Low Voltage pmDC Motor (somethin like this NFA03MG-011) with 10ohm resistance. It works beetween 1.5V-4.5V with a maximum power of 0.2W.

The capacitor used is a Back-up Capacitor of 1 Farad (yes one farad). Which i calculate giving the right amount of power and voltage for run the motor about 3-5 seconds. But no way to make it work in real.

Thanks a lot for your interest

P.S. I also tried with a capacitor of 220uF

[msdaif]

@SerMarelli

It does NOT work with a DC motor. Only AC single-phase motors.

[msdaif]

@SerMarelli

@SerMarelli

What was the type of motor and the type of capacitor?

[TerminalJack505]

Nice video.

I notice in the comments that some people believe that the capacitor in the video should be called a such-and-such "millifarad" capacitor. It is bad form to use the term millifarad. The reason being (if I remember correctly) is that manufacturers would (as shown in the video) use the prefix 'm' for MICRO Farads when they should have used the prefix 'u'. Because of this, the term millifarad is discouraged since it causes unnecessary confusion.

[JJINCWorldWide]

Thank you now I finally get how to use a capacitor.

[fvboss429]

ok thanks....one more thing when do I know if the capacitor is charged? maybe with a voltimeter right? and if its possible how can I amplify the output of the coil (increasing its power)

[msdaif]

Yes, use a voltmeter. But I didn't understand your question about the coil. The power can be increased by increasing this product: voltage x current.

[msdaif]

If you mean a faster coil gun, this means you need to use power electronics to switch the power to the coil. If you mean a stronger magnetic field from the coils, then you need to wind manay turns to from a coil. Moreover, using a higher capacity capacitor increases the power delivered to the coils. But fast switching is important in this application

[fvboss429]

hi

i have a camera flash capacitor the label says "330v220uF", the circuit charger for the capacitor is messed up...how can I charge it !?

thanks in advance =D

[msdaif]

You can charge it with:

1. a battery e.g. 9V 2. DC power supply

But be careful! Connect the positive terminal of the capacitor to the positive terminal of the battery. Please read the comments below

[fvboss429]

I forgot to mention that I was building a coil gun...my bad

So the question remains...how or what could I use to amplify its power (making the magnetic field more powerfull)...search the web to see the diagrams for a coil gun, so you can understand it better

[djdamdam99999]

can i use battery to charge my capasitor (10V) ... and how many volts must i apply to charge it ... !!! ?

[msdaif]

If the capacitor is rated for 10V, then you can use a 9V battery. However, you must connect the positive terminal f the battery to the positive terminal of the capacitor. For safety precautions, put the capacitor inside a glass box and use long wires so that u can make the connections outside the box. An over rated capacitor may explode. Be careful

[akazification]

Thank you! This video helped me a lot

[Holden448mex]

tHAT's a monster capacitor.

[YTBYTBTB]

excelent video ;)

[Babis995]

thank you, nice video

[kraudio7]

"One sixty thousand MICRO farad capacitor..."

Micro??? Shouldn't you say Mili?

[msdaif]

It is 160 mF but the objective was to show people how to read the label on the capacitor. This is an educational video

[kraudio7]

@msdaif Ah, got it! I'm sorry but did not get the first time that it was written in the description.

[Bioeccentric]

*Yawn*

[msdaif]

Time constant = lamp resistance x capacitance

Total charging time = 5 x time constant

[bigbangAT]

if you replace the lamp at the discharging progress with a low resistance inductor. will you then get a EMP effect strong enough to disable a small calculator?

[msdaif]

Actually, the capacitor during the discharging mode acts like a battery. So when an inductor is connected during this mode, it acts as if it were connected to a battery i.e. the inductor current rises exponentially up to a maximum value which is the capacitor voltage, Vc, at time of discharging, t=0, divided by inductor's resistance or Vc/R.

So the capacitor's energy is transferred to the inductor and stored as a magnetic field. BUT what do you mean by EMP & calculator. Please clarify.

[bigbangAT]

@msdaif

its known that a strong electric magnetic pulse may toast any electronic device thats close enough. its also known that if you put a large emount of voltage thru a inductor that it creates a elctro magnetic field. the strenght of that field depends on how much voltage you put on it. if its strong enough it can disable every electronic device thats in his range permanently

[msdaif]

Please check your inbox. I sent a message

[TheKhubsurat]

good video

[mansehrvi]

good video

[amartinjoe]

thank you very much for uploading this.

[big77pil]

very informative . now i understand how they really work .

[mansehrvi]

really helpful

[Nupri13]

Thank you so much! This is a great video, explained very well...I finally get it!

[Shiftz33]

i know that those capacitors and car audio capacitors work the same.... so how do i test my 3.0 farad car audio capacitor to see if it even works?

[USAPatriot1]

In the second section of the video, where you monitored the charging with the lamp, why did the power supply not overcharge the capacitor? Voltage may have equalized but the current would still flow, right?

[msdaif]

No. The current ceases when the capacitor is fully charged because the complete accumulation of charge in the capacitor blocks any further charges from flow. The capacitor then acts as an open circuit.

[oleksiypilyugin]

thanks

[6satan6ist6]

Noob lol

[Juckey2008]

Thanks, I will do that while monitoring the voltage with a DC volt meter.

[Juckey2008]

How would you advise discharging a 600V electrolythic cap that is fully charged and in a circuit?  I need to replace them without getting a shock. Also, is there a reason why people slowly energize caps when they first replace them in a circuit?

[msdaif]

First, switch off the circuit and wait for 5 minutes. After that, wearing shoes and gloves, connect a few hundred ohm power resistor across the 600V capacitor. I don't know of any reason why people energize capacitors slowly.

[ecn1984]

Juckey2008 make sure to be using thick rubber shoes or sandals... it saved me when i was fixing a circuit with 2 x 1000V capacitors. I only realized when I accidentally earthed it lol.

[6satan6ist6]

they cap is enormous why does it only last a few seconds?

[alex681219]

Hi, I find some old filter-caps in a fleamarket.

One nichicon with 6 terminals a:200MFD 300WV b:10MFD C:20MFD D:20 and E:120MFD...I´m Newby in the electrical stuf and buy for the big size for experimentation, can i charge it with 12V? power suply...what means WV? the mega farads means more electricity storage capacity? tkz for share

[msdaif]

1. WV means 'working voltage'

2. You can charge it with 12V if WV is 12 or more

3. Check the polarity.

4. 200MFD means 200 micro farads. The bigger MFD, the bigger the capacity

[alex681219]

tkx sir, the wv is 300, can i use a capacitor like a battery conected to some "electric regulator valve"?, for example I charche in 200mfd mode 300 WV and conect a 9 volt led array trought the "valve regulator", or allways the capacitor gives the full charge in a second?

[namzer0]

Wait! are you saying that:

Voltage charged = voltage discharged?

So how come a camera capacitor charged with 3V batteries or a TV capacitor charged with 220V sparks when discharged with a screwdriver? Say, 220uf, 400V TV capacitor. is it the 220V being discharged or the 400V(if its the 400V, how did it reached 400V using a 220V supply)?

[msdaif]

In the camera, there is a circuit that steps up the 3V to higher values. The capacitor charges to whatever voltage is applied to it.

[jjojjorge]

What is the difference between a voltage-rebound in air and in vacuum (After the capacitor has been shorted)? I conjecture that there should not be much difference, but anyway, it is thought provoking.

[msdaif]

Short circuiting a capacitor with a piece of wire (0 resistance) produces a spark which can be extinguished in vacuum. However, this method is not allowed for big capacitors. The proper way is to short the capacitor through a resistor.

[jjojjorge]

Okay, thanks msdai. Why does voltage makes a rebound in a discharged capacitor? And can there be a voltage rebound in vacuum? I assuming there is always a voltage rebound whether in air or vacuum.

[jjojjorge]

Well, I am sure there is always a voltage rebound, but generally negligible at least.

[msdaif]

A capacitor discharges exponentially and the average time it takes to practically reach zero volts is 5xRxC where R is the resistance (ohm) in series with the capacitor, and C is capacitance in Farad. If the short circuit is removed before the time 5xRxC, then the capacitor will keep its remaining charge for some time. But I could not understand your question. What do you mean by voltage rebound? Do you mean initial condition value ?

[jjojjorge]

First, thanks for taking the time msdaif.

Okay, I mean totally discharged with a "short", it is said that : when the short is removed, the capacitor will slowly begin to get a small voltage.

[msdaif]

A voltage rebound occurs if the capacitor is charged before the time 5xRxC.

[jjojjorge]

Thanks, I'll go learn more from what you have stated during these replies.

[ChupacabraArisco]

HA lol pussytive:-)

[IndyR0ck]

THANK YOU!

[gtapro151]

I mean with a car battery

[gtapro151]

you forgot the resister....at least if your charging it for a car you need a resister between the + connections

[McGuywer]

I don't think it's correct to connect a large capacitor to the power supply directly, as he does at 1:40, without a resistor in between. The initial current will be so high, that it can ruin the power supply.

[msdaif]

Dear McGuywer,

It wouldn't harm the power supply because the applied voltage was low.

[McGuywer]

In the Ohm's law, U = I x R, we can see that when (R) (in our case the capacitor's reactance) drops toward 0, the (I) tends toward infinity, to fulfill the formula, no matter what the (U) real value is.

The reason nothing blew up is because the thin wires you used have sufficient additional resistance plus the power supply's internal resistance must be also nonzero, so the overall resistance never drops to zero. But I guess this should be mentioned as a precaution for those that want to try.

[matBTF]

paki ass

[hai2you2]

Let me guess matBTF you didnt finish college did you? Go back and take the garbage out at work.

[colbymclellan6]

now hows that supposed to help me .. who the fuck has one of those lying around their house

[TR86]

i kn0ow, what a load of horse shit. take your bull shit accent and your bull shit video back to your own country.

[hai2you2]

Poor little brained man. This is your country? You are Native American?

[abidachini]

very helpful...thanks alot............

[blackbrigade197]

شكرا على الفيديو

[Anik04]

nice video except the accent! :D "pussytive terrd minal" lolz..never mind..no offense..keep up the good work! (Y)

[h0lx]

I think his accent is really cool.

[KrazyKuul111]

omfg, i wouldnt touch that capacitor!!! i was scared taking apart my digital camera.. and this!!!

[h0lx]

You wouldn't feel 6V

[lolesossp]

would you feel 16v?

i have 2 16v 1000uF capacitors that i dont know how to use

[94thts]

1farad capacitance?! That's a lot! You shouldn't touch it!

[lolesossp]

no. 1000uF is 1mF. 1000mF is 1F

[asynchrono]

60V is considered the threshold for safe human contact.

[lolesossp]

i got shocked from 450V

[tucumalo]

jajajaj

[falwk]

It has more to do with current than voltage regarding the safe "threshold"

[Iizmstrcheef]

The Teerrrdminall?

[ljheard]

How do you discharge a HID capacitor?

[xXYewTewbXx]

Calculate the capacitor current you do supply voltage minus the voltage divided by the resistance i think.

[Deshpande112233]

i apriciat the effort, and it is useful demonstration for students. the language is very simple and lucid .thanks

[Anik04]

lolz..so is your spelling! :P

[xXYewTewbXx]

a capacitor may also explode if the insulation dries up over time.

[korsez]

if i conect lamp between capacitor - and - terminal will it light brighter when it is charged?

[drewadc]

No, whenever a capacitor is charged, it acts like an open circuit. This means that no current will flow in the circuit when a capacitor is charged.

[zomgerln]

it is fully charged..

K, UBER THAT HEAVY AND STORM THE BLUE TEAM!

[redSHIFT69]

great MCAT review! thanks :)

[kkob]

I can't find this answer: If a power source is connected to the capacitor which is connected to a load, will the capacitor act in pulses as it charges, dishcarges to the load, charges, etc? Or, does the load being always connected just drain the capacitor at a constant rate? I want to pulse an electromagnet using some sort of renewable energy, say from a solar array, windmill or ??. Are there capacitors that discharge only at a certain level of charge?

[msdaif]

The capacitor charges and discharges exponentially as shown on the video. The capacitor is used to supply energy for a short time; an example is the camera flash.

[kkob]

I guess I wasn't clear: If I have a very weak power supply, so I put in a capacitor to store up enough energy to use (voltage?) and have the capacitor connected to an electromagnet, do I need a switch to get it to power the magnet in pulses?

[msdaif]

Right. The capacitor may aid the power supply but 1. the capacitor charging takes time and 2. the electromagnet needs enough current to be energized

[kkob]

So how do I make a capacitor discharge at a given level of current? And, how do I figure out how much current I need to energize the magnet? Sorry, I'm a complete idiot on this but have an intriguing idea I want to try.

[msdaif]

For a load with a resistance R, a power supply with e.m.f of E, the current is

I=E/R. For the electromagnet, you need to measure its resistance , say RL, and energizing current, say IL. Then,

IL=E/RL. You could send me an email explaining what you want to do and I can help you with the design, free of charge.

[traquino]

Forgive my ignorance, but isn't the voltage of the charging capacitor logarithmic instead of exponential?

[msdaif]

Exponential

[yomomtubes]

That cap is huge.

[israelgaribaldi]

excellent. great video. all the information i needed and more. i had to login and tell you that.

[smkymcnugget420]

Great vid man, thanks for posting :)

[ThePrisOerR]

peace be up on msdaif ... hope ur k ... just wannet to thak you for uploading this video .. its really usefull ... nd hlpd me with my assingment thank you

[sr5813]

capacitors don't explode, at least not 10v capacitors

btw very good educational videos

[kkob]

As far as I know, any capacitor will explode if you exceed their voltage. It charges or destroys the dielectric, I believe, just like crossing your wires on any electric circuit. (I think.)

[msdaif]

The capacitor may explode if:

1. its rated voltage exceeded or

2. it is connected in reverse

[mikeyidh]

Are there Ac power capacitors.

[frizspin175]

all capacitors are AC, including this one. the 2nd demonstration of the lamp explains that the capacitor has an equal # of electrons on both leads so it stops supplying power to the lamp. capacitors work with AC current because the current alternates, so there is a constant push and pull of electrons between the two leads on the capacitor so it doesn't become neutral.

[gccengineering1996]

Q: Where did you get that type of capacitor? Thats something I could use for a non filtered power adapter for a shortwave radio.

[msdaif]

It was dismantled from an old mainframe computer.

[pimpmastahanh]

i was only a ten volt capacitor but was huge. I dont think a discharge was nessesary.

[btieet]

Well, the objective was to demonstrate the concept.

[JoPissvengance]

It looks like it came from the seventies man! We've got mobos with like 32v capacitors on them, imagine using this type of technology!!

[DWOcc]

teeerminal:D

[gstraitman]

nice job keep it up, interesting.

[hungrygit]

Interesting stuff, thanks

[Activethrasher00]

LOL now that is a god damn capacitor

[mickbmcc]

Thank you, very good and interesting Video.

[eepyaj19]

i thank the author/director of this video.

it's been a hard time for me to learn this concept but after i watched this video, i have now a clear idea on how charging and discharging capacitor happens.

by the way im a Education student major in Physics.

well thanks again!

[CSBSerjay]

anam allahtan boyle kapasitor kullanmioz ya bu ne be kafam kadar :D

[denizea]

just like a jeneratör which can hold all the Ankara's need.. :)

[TsChiNaaR]

just Ankara? :)

[sinanalm]

amma büyük kafasitör

[Bob7k]

I need to take an electronical engineering class D:

[buckbeestreet]

a capacitor seems alot like a weak rechargeable battery.

[npiper]

Many "Super Caps" capacitors of 1 farad or greater are used to to keep ram running when the power is turned off in new "Solid State" drives

[forthereg]

exactly ! exept that cap is a very ideal battery and usally the input = output and everything can be measured to the mini volt so we can use it to measure times or control frequesncys like the boss controller ! and mte 1F cap if freeking huge , if u dont mean 1 uf