⚠ This video took a long time to make if you would like to buy me a coffee to say thanks, link below: ☕ PayPal: paypal.me/sdaspay Patreon: www.patreon.com/techstudycell
Big problem is when the capacitor is in the circuit. I got a big shock that threw me some feets away from a very high volts capacitor in a digital camera near flash light section when I was trying to modify the camera. All it took is a accidental touch, we careful with a capacitors in electronics devices, they can be fatal!
So as idiot kids in the 90's we used to take apart disposable cameras when they were spent, strip wires and solder them exposed near the outside, charge up the flash capacitors and, toss them to each other to catch... At times I'm surprised I'm alive now and still have all 10 fingers and toes...
@@center4nerds Wow, and I thought that jumping on and off of moving trains and throwing empty cans of Raid in a camp fire were dangerous things I did as a kid ! I'm surprised I'm still walking around in 1 piece too, without any visible scars... LoL
@@konglives4453 I did something crazy when I was a teen... I poured a jerry can of petrol (gasoline) over a camp fire and the top spout caught a flame. I panicked because I thought it would explode so, I blew it out, but I even today , I think how it could have exploded in my face, particularly if the flame had blown downwards into the can.
It seems like you could look at the values of both the capacitor and the resistor, and only apply the resistor for a short period before testing again. That way you can figure out almost exactly how long to apply the resistor and write it down for each test. I suppose it would be a good idea to test the resistor every time to see if it's still functional as labeled.
Depends how fast you wanna discharge the capacitor. The smaller resistance resistor you have, the hotter it will become and the faster it will discharge. So if you have 25V charged capacitor that you wanna discharge with a regular blue metal film capacitor that is only 1/4 watt, you need around 3k ohm resistor and some time. If you have a 1w 680 ohm resistor you can discharge it quicker without burning the resistor up. This is all is taking in account that we will not be crossing the operational limits of the components, if you don't care much and the capacitance of the capacitor is lower you can get away with using less powerful resistors for a short amount of time. Just wear some personal protection in case something goes south. Also if you are discharging high voltage capacitors then you need to recalculate all the stuff using ohms law
I don't think it matters too much as long as you pick a resistor value high enough to keep the current low. Cause too much current through a low resistor could be dangerous for you, the resistor and the capacitor. Example: if the capacitor voltage is 35V and the resistor is 1 Ohm, you're gonna get 35A of current initially which is super dangerous. Also make sure the resistor is rated for a high enough wattage. Watts = V x I. So if V is 35V and your resistor is 100 Ohms, I = 0.35 Amps, so your resistor needs to be rated for at least ~12W. if you use a 1k resistor, I = 0.035 so you only need a resistor rated for ~1.2W. The drawback is that it takes 10x as long to fully discharge the cap. But since caps discharge logarithmically (quickly at first, then slowly, it probably won't take 10x as long to discharge to a safe voltage).
Would it be sensible to leave the multi-meter attached to the capacitor legs while discharging it with a resistor to see when the voltage has dropped to near 0? Also how do you determine the appropriate type/rating of resistor to use?
Will this one work to discharge high current HVAC Capacitors? Wirewound Ceramic Cement Resistor 10W Horizontal,10 Ohm? Is there a reason why your using a 200 Ohm for the bigger capacitor?
@@TechStudyCell No, if you want to be responsible, you should delete that comment not rely on another's comment to address the issue. The fact is that someone may need to click "view reply" in order to see what I wrote. I commented because you were failing to moderate your own comment feed. I'm disappointed.
@@ng-iq4kx if somebody isn't smart enough to know not to put his tongue in an electrical component I think he shouldn't be working with electricity anyway
@@harry8184 True, there's electric shock but it's amps that will kill you. That's how cattle fence works, low amps. I'd hate to see some unknowledgeable person get killed because of bad advise.
Can I use the resistor more than once, or should I get a new one for a next operation, since it will be damaged by the capacitor? And more, is it then safe to touch the resistors' terminals? Thanks!
For How much time capacitors keep the charge inside after switching off? Is it safe if i disconnect them from a board, touching only one terminal while desoldering? Thanks again!
Capacitors can hold a charge for a VERY long time. I took apart a space heater I had not used in 6 years and when I checked the capacitors there was still 1.5 volts in there. That's a tiny amount but the fact that there was still voltage present at all after 6 years is insane. Always check first! Solder is metal so it will conduct.
I have 50v 1000uf capacitors I want to discharge. I have 1 watt resistors, but I see you recommend using a resistor closer to 3 watts to drain, but is it okay if I solder together three separate 1 watt resistors to basically create a 3 watt resistor? Thank you
Hi, I'm new to electronics. I'm kind of scare of capacitor. I know it can explode. So what is the safe voltage and farad to play around with? I have 35v 1000uf capacitor and a 9v battery (for Arduino project). How long to make it fully charged? and how long for it to be discharged? What is voltage to be considered dangerous?
If you charge that capacitor with the 9v battery, the capacitor will hold 9v, (the max is 35v, over that it could explode) and its safe for your hands because the resistance of the skin is around Mega Ohms(very high), if you calculate the current with Ohm's Law: 9v/1MOhm = micro amperes current will flow in your skin and that is not dangerous, but if you connect the two terminals with a metal stick (very low resistance) you will make a shortcircuit, and it will spark. The more Capacitance the capacitor have, the more will hold the voltage. If you have a 100000uF capacitor at 5v, will only holds up to 5v, but it will dangerous to shortcircuit with a stick, because a big spark will come out. If you charge the capacitor up to 35v it will became dangerous for your skin. I hope i've helped you
@@Cr1z4n63L So, as long as the capacitor that i have never been charged up to 35v. There is no reason to discharge it right? I'll just leave it lay around before use it again with my 9v battery.
@@jumbo999614 The capacitor charges around 3 seconds, it is really fast, and the time of discharge depends of what you put in the terminals (low resistance, fast discharge, high resistance, low discharge), check it with a multimeter
hello i would like to discharge 3 filter capacitors in a circuit, they are all rated at 500v 47+47uf/ 100uf`` when the power is turned off it have stored about 150v as they are in operation they are at 315v i know a resistor rated at 0,75w for example is enough to discharge 150v as the 0,75w tolerate about 350v and my 2w tolerate about 500v, i just wonder which resistor value is consider to be great for discharge 100-300uf 150v ? i have 100k 0,75w ,300k 0,75w & 1meg ohm 2w left,i just try to discharge 8volt with a 1w 1k ohm resistor and worked nice and quick just to try it, sincerely
hello, I'd like to discharge 3000f 2.8v supercapacitor , what resistor do i need, i tried to do the ohm law but i still can't find, i'm a beginner in electronic. can someone help me?
Damn skippy son! If you ain’t got a beer in hand while handling firearms, electrical components, radioactive materials, explosive materials and ordinance then what hell you doing?
Hello. At what voltage and capacitance would you need to use a high watt resistor? How many ohm and watts should the resistor be? What is the minimum watts and ohm of a high voltage capacitor? Thank you. God bless, Proverbs 31
Hi! Thanks for the video. I am very new to this and want to fix my tv. Could you use the green resistor on all capacitors? What happens if you use the red resistance on the big white capacitor? Is there any danger or these combinations just don't work? Thanks again
i wanted to make a tv head costume using an actual tv, but my parents said no, because of the capacitors. hopefully they will say yes when i tell them how easy it is if you do it correctly
Please, do no try this at home. If you want to do... Whatever you want to do to that TV... Just bring it to a professional. This is not as easy as you think and if you don't have proper tools and electrical security knowledge you can get yourself killed by the capacitor. Please, stay safe, don't play with these things.
I bought a 450 volt capacitor im gonna hook up to a plant.. I watched this video and was like damn good thing i watched this.. read ur comment.. I grab it and touch the metal prods fast... hearts pounding like a mad man... the capacitor was discharged before it was shipped.... going to pull out meter now... dang... it has 5 volts!! not gonna touch it again
Hello & good day sir, i just wonder i want to discharge 3 capacitors between 100-330uf that still in the circuit ,the stored charged volt after turn of the dac is about 150v i know 0,75w-2w resistor is enough , but could i ask if you know which value i can use to be safe`` i have available 1k-3k /100k-300k-1mg for example, sincerely Ivan
you must make another video explaining how to eat rice with a spoon. 1- fill the spoon 2-move your spoon to mouth 3-eat 4- repeat. thrn use three different spoons and explain well. food spoon, jam spoon, tea spoon. make aure it is at least one hour, so viewers completely understand it.
OK ! I suggest you speak slower, often, the speed of your words are a hindrance to understanding what you say. I re-listened, several times, at several spots to gain understanding. So, the information you provided was very good, but again, the speed of your spoken words hinder understanding
Hokiepokie, He went to great lengths to emphasize safety in this video. It's clear by some comments that people are learning, yet you decide you want to attempt a joke and completely undermine the emphasis on safety. First of all, your joke is not funny despite your attempt. It reads as ignorant and foolish. If anyone should ever misinterpret your non-disclaimed "joke," it could cause someone harm they did not deserve. I'd like to request the video author delete your comment and like to encourage you to know the time and place for a joke and how to deliver it.
![[435] How to Discharge a Capacitor - Capacitor Safety](/img/n.gif)
⚠ This video took a long time to make if you would like to buy me a coffee to say thanks, link below: ☕
PayPal: paypal.me/sdaspay
Patreon: www.patreon.com/techstudycell
you made it sound easy and gave a great explaination… unlike the 12 other videos I watched … thankyou
Thanks for your feedback.
Thats how it goes. 12 Americans videos can't stay focused. 1 Indians video and were educated.
like the other guy said I have watched a bunch of these videos, you are the first one to describe it correctly, thank you
I'm just starting to learn about capacitors and HOLY COW 300 VOLTS
Great explanation. Seems that it might be good for folks to consider safety glasses and nonconductive gloves also.
Yes. Thanks
Big problem is when the capacitor is in the circuit. I got a big shock that threw me some feets away from a very high volts capacitor in a digital camera near flash light section when I was trying to modify the camera. All it took is a accidental touch, we careful with a capacitors in electronics devices, they can be fatal!
So as idiot kids in the 90's we used to take apart disposable cameras when they were spent, strip wires and solder them exposed near the outside, charge up the flash capacitors and, toss them to each other to catch...
At times I'm surprised I'm alive now and still have all 10 fingers and toes...
@@center4nerds Wow, and I thought that jumping on and off of moving trains and throwing empty cans of Raid in a camp fire were dangerous things I did as a kid ! I'm surprised I'm still walking around in 1 piece too, without any visible scars... LoL
@@konglives4453 I did something crazy when I was a teen... I poured a jerry can of petrol (gasoline) over a camp fire and the top spout caught a flame. I panicked because I thought it would explode so, I blew it out, but I even today , I think how it could have exploded in my face, particularly if the flame had blown downwards into the can.
It seems like you could look at the values of both the capacitor and the resistor, and only apply the resistor for a short period before testing again. That way you can figure out almost exactly how long to apply the resistor and write it down for each test. I suppose it would be a good idea to test the resistor every time to see if it's still functional as labeled.
Great informative video, how do you calculate the value of the resistor you are going to use for the capacitor?
how do you calculate the value of resistor for discharging each capacitor ?
Depends how fast you wanna discharge the capacitor. The smaller resistance resistor you have, the hotter it will become and the faster it will discharge. So if you have 25V charged capacitor that you wanna discharge with a regular blue metal film capacitor that is only 1/4 watt, you need around 3k ohm resistor and some time. If you have a 1w 680 ohm resistor you can discharge it quicker without burning the resistor up. This is all is taking in account that we will not be crossing the operational limits of the components, if you don't care much and the capacitance of the capacitor is lower you can get away with using less powerful resistors for a short amount of time. Just wear some personal protection in case something goes south.
Also if you are discharging high voltage capacitors then you need to recalculate all the stuff using ohms law
thanks so much from Egypt
You are welcome 😊
How to calculate Ohm and Watt resistor from capacitor?
Yup
I don't think it matters too much as long as you pick a resistor value high enough to keep the current low. Cause too much current through a low resistor could be dangerous for you, the resistor and the capacitor.
Example: if the capacitor voltage is 35V and the resistor is 1 Ohm, you're gonna get 35A of current initially which is super dangerous.
Also make sure the resistor is rated for a high enough wattage. Watts = V x I. So if V is 35V and your resistor is 100 Ohms, I = 0.35 Amps, so your resistor needs to be rated for at least ~12W. if you use a 1k resistor, I = 0.035 so you only need a resistor rated for ~1.2W.
The drawback is that it takes 10x as long to fully discharge the cap. But since caps discharge logarithmically (quickly at first, then slowly, it probably won't take 10x as long to discharge to a safe voltage).
Thank you for the great video. What about in-circuit capacitors? Should we discharge them? And would it the same way by using a high watt resistor?
Very helpful.
Thanks
That is some great advise. Thanks for sharing your video.
You are welcome
Thank you sir, have a good day.
Would it be sensible to leave the multi-meter attached to the capacitor legs while discharging it with a resistor to see when the voltage has dropped to near 0?
Also how do you determine the appropriate type/rating of resistor to use?
How do you determine what size resistor to use?
Thank you Sir it's very useful. ...
Thanks for the feedback
Thank you sir very much for your informative video.
Thank you very much for your help!
I have small 35v 1000uf. So if i plug it to LED until it no longer emit the light, does it mean it fully discharged?
If you connect a 1.5 or 3 v led to discharge 35v capacitor the the led will burn out. Use always high wattage resistor to discharge a capacitor.
Does this work in circuit? Can I just use one very large resistor to discharge both large and small value capacitors?
Sir Safety rules bataye
Kya savdhani baratni chahiye taaki zatka na lage?? Series testing lamp use karte samay
Nicely explained. Do video how to charge
Will this one work to discharge high current HVAC Capacitors? Wirewound Ceramic Cement Resistor 10W Horizontal,10 Ohm?
Is there a reason why your using a 200 Ohm for the bigger capacitor?
Useful video 👍
Good .
Thank you. It is very useful! Nicely explained!
Thanks for the feedback
electronics.stackexchange.com/questions/451331/operate-12v-5v-ne555-timer-relay-from-12v-dc-supply-and-capacitor
Nice info sir
Thanks.
@Tech StudyCell Your emphasis on safety is very much appreciated! Would you please do us a favor and delete the Hokiepokie comment below? Thanks!
You have already replied him. Thanks for the feedback.
@@TechStudyCell No, if you want to be responsible, you should delete that comment not rely on another's comment to address the issue. The fact is that someone may need to click "view reply" in order to see what I wrote. I commented because you were failing to moderate your own comment feed. I'm disappointed.
@@TechStudyCell That's a bad joke on a dangerous subject. Guaranteed somebody will try to do just that.
@@ng-iq4kx if somebody isn't smart enough to know not to put his tongue in an electrical component I think he shouldn't be working with electricity anyway
@@harry8184 True, there's electric shock but it's amps that will kill you. That's how cattle fence works, low amps. I'd hate to see some unknowledgeable person get killed because of bad advise.
nice
Thanks
His finger gives me chills.
Instead of having many resistors around why not use only one 10w resistor for discharging all capacitors?
Yes. That can be done
I don’t have 10 watts resistor ,any other smaller value?
@@nilolee2426 connect small value capacitors in parallel but make sure the resistance remain high...
Can I use the resistor more than once, or should I get a new one for a next operation, since it will be damaged by the capacitor? And more, is it then safe to touch the resistors' terminals? Thanks!
Yes. But use high wattage resistor
If you are still alive, don't touch both the resistor terminals when it makes contact with the capacitor, its like touching the capacitor itself.
@@TechStudyCell
Thanks!👍
@@letthedramabegin8
Thanks to You as well!👍
Thank you for sharing this video...
You are welcome.
Can i use a large resitor for any capacitor. ??
For How much time capacitors keep the charge inside after switching off? Is it safe if i disconnect them from a board, touching only one terminal while desoldering? Thanks again!
Capacitor can hold the charge for long time if there is no bleeder resistor connected. It's better to discharge the capacitor first then desolder it.
Capacitors can hold a charge for a VERY long time. I took apart a space heater I had not used in 6 years and when I checked the capacitors there was still 1.5 volts in there. That's a tiny amount but the fact that there was still voltage present at all after 6 years is insane. Always check first! Solder is metal so it will conduct.
@@TechStudyCell
Thanks a lot!
@@esl4058
Thanks mate, too!
Thank you
Welcome
Can you use a 10W 25ohm resistor to discharge a 300V capacitor?
I am using 144 capacitor for 10 hp to run in 2 phase.what resistor I can use to discharge this capacitor? Please reply to me sir!
I have 50v 1000uf capacitors I want to discharge. I have 1 watt resistors, but I see you recommend using a resistor closer to 3 watts to drain, but is it okay if I solder together three separate 1 watt resistors to basically create a 3 watt resistor?
Thank you
Yes you can do it with 1 watt. It will be better if the resistance value is low (less than 20 ohm)
2:55 please do not touch any metal with your beer hand... otherwise you might not drink tonight
Hi, I'm new to electronics. I'm kind of scare of capacitor. I know it can explode. So what is the safe voltage and farad to play around with?
I have 35v 1000uf capacitor and a 9v battery (for Arduino project). How long to make it fully charged? and how long for it to be discharged? What is voltage to be considered dangerous?
If you charge that capacitor with the 9v battery, the capacitor will hold 9v, (the max is 35v, over that it could explode) and its safe for your hands because the resistance of the skin is around Mega Ohms(very high), if you calculate the current with Ohm's Law: 9v/1MOhm = micro amperes current will flow in your skin and that is not dangerous, but if you connect the two terminals with a metal stick (very low resistance) you will make a shortcircuit, and it will spark. The more Capacitance the capacitor have, the more will hold the voltage. If you have a 100000uF capacitor at 5v, will only holds up to 5v, but it will dangerous to shortcircuit with a stick, because a big spark will come out. If you charge the capacitor up to 35v it will became dangerous for your skin. I hope i've helped you
@@Cr1z4n63L So, as long as the capacitor that i have never been charged up to 35v. There is no reason to discharge it right? I'll just leave it lay around before use it again with my 9v battery.
@@jumbo999614 The capacitor charges around 3 seconds, it is really fast, and the time of discharge depends of what you put in the terminals (low resistance, fast discharge, high resistance, low discharge), check it with a multimeter
Nice information
Thanks
Greerings👍....Does the size resistor matters?
Generally size increase with the wattage of the resistor. So that it can dissipate more power..
Ragistor ko capasitor per kon si tango per lagana cahiya?? Please reply
To discharge the capacitor you have to connect the resistor across the 2 leads of capacitor.
hello i would like to discharge 3 filter capacitors in a circuit, they are all rated at 500v 47+47uf/ 100uf`` when the power is turned off it have stored about 150v as they are in operation they are at 315v i know a resistor rated at 0,75w for example is enough to discharge 150v as the 0,75w tolerate about 350v and my 2w tolerate about 500v, i just wonder which resistor value is consider to be great for discharge 100-300uf 150v ? i have 100k 0,75w ,300k 0,75w & 1meg ohm 2w left,i just try to discharge 8volt with a 1w 1k ohm resistor and worked nice and quick just to try it, sincerely
Beer Hand strong my man
what resistor do i need to use for a 10000uf 25v
Please teach us how to make a capacitor bank for a home refrigerator to save power!
hello, I'd like to discharge 3000f 2.8v supercapacitor , what resistor do i need, i tried to do the ohm law but i still can't find, i'm a beginner in electronic. can someone help me?
Can i discharging it which capacitor still in ic board ?
yes
At 2:56 I heard you say not to touch the terminals with my beer hand. Wouldn't that hand already be busy holding the beer?
Damn skippy son! If you ain’t got a beer in hand while handling firearms, electrical components, radioactive materials, explosive materials and ordinance then what hell you doing?
Im going too change my old 20000uf 50volt i think capacitors in my old welder i feel safer now .
Hello. At what voltage and capacitance would you need to use a high watt resistor?
How many ohm and watts should the resistor be? What is the minimum watts and ohm of a high voltage capacitor?
Thank you. God bless, Proverbs 31
Hi! Thanks for the video. I am very new to this and want to fix my tv. Could you use the green resistor on all capacitors? What happens if you use the red resistance on the big white capacitor? Is there any danger or these combinations just don't work? Thanks again
It depends on the capacitance. So it better to take help from electrician.
i wanted to make a tv head costume using an actual tv, but my parents said no, because of the capacitors. hopefully they will say yes when i tell them how easy it is if you do it correctly
Please, do no try this at home. If you want to do... Whatever you want to do to that TV... Just bring it to a professional. This is not as easy as you think and if you don't have proper tools and electrical security knowledge you can get yourself killed by the capacitor. Please, stay safe, don't play with these things.
can you discharge a capacitor with another capacitor that haves the same value?
Danger. 300v. And then he points at it almost touching the leads and the metal probes attached to them.
I bought a 450 volt capacitor im gonna hook up to a plant.. I watched this video and was like damn good thing i watched this.. read ur comment.. I grab it and touch the metal prods fast... hearts pounding like a mad man... the capacitor was discharged before it was shipped.... going to pull out meter now... dang... it has 5 volts!! not gonna touch it again
Safety glasses mouth closed lol use 12kv insulated gloves safety is number one priority guys its not worth dying for
300 volt that doesn't need that big of a resistor
Hello & good day sir, i just wonder i want to discharge 3 capacitors between 100-330uf that still in the circuit ,the stored charged volt after turn of the dac is about 150v i know 0,75w-2w resistor is enough , but could i ask if you know which value i can use to be safe`` i have available 1k-3k /100k-300k-1mg for example, sincerely Ivan
you must make another video explaining how to eat rice with a spoon. 1- fill the spoon 2-move your spoon to mouth 3-eat 4- repeat. thrn use three different spoons and explain well. food spoon, jam spoon, tea spoon. make aure it is at least one hour, so viewers completely understand it.
You are not charge capacitor
OK ! I suggest you speak slower, often, the speed of your words are a hindrance to understanding what you say. I re-listened, several times, at several spots to gain understanding. So, the information you provided was very good, but again, the speed of your spoken words hinder understanding
Thanks for the feedback...
what language is that????
We usually just put them on our tongues...
Hokiepokie, He went to great lengths to emphasize safety in this video. It's clear by some comments that people are learning, yet you decide you want to attempt a joke and completely undermine the emphasis on safety. First of all, your joke is not funny despite your attempt. It reads as ignorant and foolish. If anyone should ever misinterpret your non-disclaimed "joke," it could cause someone harm they did not deserve. I'd like to request the video author delete your comment and like to encourage you to know the time and place for a joke and how to deliver it.