What does a capacitor do?
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- เผยแพร่เมื่อ 30 มี.ค. 2019
- In this video, I'm connecting a circuit with an LED and a resistor. To show you exactly what a capacitor does.
If you want to learn electronics from scratch - check out my blog www.build-electronic-circuits...
When I connect the plus and the minus from the battery, the LED lights up.
Nothing magical here.
And in the exact moment when I disconnect the power, the LED turns off.
Next, I'm connecting a capacitor.
I connect it across the LED and the resistor.
Then I reconnect the power, and the LED lights up again.
But take a look at what happens when I disconnect the power:
The LED stays on!
And after a few seconds, you can see it fading out.
This is because the capacitor is kinda like a tiny battery.
When I connected the power, it charged up.
Then when I disconnected the power, it started using its stored energy to keep the LED on.
This is very useful to make for example a time delay in a circuit.
Or to make filters.
If you have no idea what a filter is, here's a simple one:
Imagine a terrible battery that for some reasons keeps turning the voltage on and off every second.
Without the capacitor, the LED would be blinking.
But with the capacitor, you'll filter out the OFF periods and get an LED that is always on.
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Thanks for watching! - วิทยาศาสตร์และเทคโนโลยี
Thank you for getting right to the point. It's amazing how your short video explains this better than some long videos here on TH-cam
My teacher sent us this link thorough online school
He is proud of himself
Finally a video that doesn't have to do something complicated to explain it and just gets straight to the point. Thank you.
A great way to demonstrate how a capacitor works
Your teaching skill is exceptional!
Wooah, that was a short crash course that was absolutely amazing
Great explanation, the best I have seen for a capacitor.
Simple and brief video. Thanks Professor
Excellent breadboard set up.
Thanks. I connected a LED light to my alarm clock to see the analog tuner at night but it is never a constant light since it turns on and off based on the sound. Looks like a capacitor is what I need and I found one from an old rc remote.
thank you very much for such great concise explanation
Thanks for this great explanation!
Very good explained and informative. Thanks.
This video was so helpful, thank you!
You are a marvellous teacher
Simplest explaination of capacitor
Very useful video. Thanks
Succinctly explained, thanks!
This video could have saved me a lot of time 30 years ago. Alas..... kids today don't know how good they have it.
Short and clear.. 👍👍👍👍
Very interesting and informative.
Hey man! I consider you as my primary teacher :) thanks
I'm glad I can help =)
@@OhmifyWhat was the value of Capacitor and how much volts was your battery? I'm unable to get this work with a 25v Capacitor with a 9v battery and 10k resistor. It works normally but not if I add the Capacitor
Very helpful, thanks so much
Thanks!!! I totally understand now!!!
Amazing,
Ultimately I got this❤
Good video Boss 👍👍👍
Very nice , the best .
Thank you so much!
Short and sweet
I learned something new today
help me on this please!what type of capacitor do i need to buy in order to give a spotenious fade when i turn off the switch on a 12v 100watt halogen car lamp!
Thank you.
This video is so good
Great work
Thank you! Cheers!
@@Ohmify I'm learning electronics to robotics.
Your work is very useful.
Hi there! I want to use a capacitor to stop a 12v small led flickering . I aimed to 16 v capacitor but not sure what UF to chose. Do you think 22 UF or 47 UF will do, or should I get a higher UF ?
I'm not sure really. I recommend just testing a few different values. But 22µF or 47 µF both seem like good values to start with.
Hi sir, do I have to add diode on Voltage input to protect dc circuit if ever I need to make bigger project? Thanks in advance. newbie here
A diode on the input is usually used to avoid connecting the power supply the wrong way - or to choose between two power sources.
Sir you are greatest
Very much helpful. Can you tell me what volt-capacitor should i use for a 12 volt LED strip? I will replace my Yamaha keyboard's display backlight(ccfl) with LED. I will take the 12 volt power from any voltage regulator located in the power suplly board inside. Thank you
The voltage rating must be higher than 12V, but there's no limit on how high. So choose any rating higher than 12V.
thanks 👍
I want to ask, how can I maintain the arduino r3 running at 12v for 2sec while switching to alternate power source.(Note: I have the main power source producing 12v and a battery producing 12v too) the power module circuit is yx850 power failure system. There's a a delay in the module when switching
Just use a capacitor with enough capacitance, and you should be able to do that. How much capacitance depends on how much current your circuit is pulling. But you could experiment to find out how much you need.
Thank you
If i have a small solar panel. And the output is 5vdc can i add a cap. At the output to make it move of a stable voltage. . It will charge my phone but i am trying to make it work better with less Fluctuation on the output side.
A capacitor will help reduce ripple, yes
Thanks!
You are very nice sir
How do you find out how many voltage and farad of the capacitor to use with LED and 9v battery?
The voltage on a capacitor is how much voltage it can handle. So you just have to make sure you don't have a capacitor with a voltage rating lower than what you plan to use. For the farad value - it depends on the time you want it to take to fade out. Higher farad value means longer time.
i can't get it to work but i did the exact same thing and used the exact stuff in this video any help? or advice?
If you did the exact same as in the video, the only potential problem left is that one of your components is damaged
After doing this do we need to remove the capacitor and discharge it, or did it already get discharged when the led finally turned off?
When the LED turns off, it's not 100% discharged. So if you for some reason need to discharge it completely, yes, you'll have to do that manually.
I want to install Smart WiFi Switch with my AC do I need to install Capacitor or I can just wire the wires directly with the Switch. Thanks
I'm not familiar with that product, so I can't answer.
Hi Sir, I have a question. For touch screen switch and some smart light bulb, when you turn off the switch, the light bulb only dim and not completely turn off. but when a capacitor is added between the live and neutral cable, the light bulb is completely turn off. Able to illustrate what is the reason behind that?
No idea
@@Ohmify ok thank you.
I'm new to Electronics. Can i do this with 35v 1000uf capacitor? It's not going to explode into my eyes right?
What value of your capacitor and resistor you used in this video?
Yes, you can. And you don't have to worry about it exploding as long as you use a standard 9V battery. (If you connect it to 110 or 230V, expect a small explosion). I think I used 1000 µF capacitor and a resistor of 470 ohms.
What capacitor should i use with 12v1amp dc power adaptor with led to make slow dim effect after power off
As big as possible. The bigger, the longer the dim effect.
@@Ohmify thanks for the information. Soon I will try
Which way to connect it polarity wise?
Plus pin towards the plus terminal of the battery.
Will this have same effect for 120V AC
No. With AC you would first charge the capacitor, then discharge the capacitor, then charge it, then discharge it, then... And so on.
How do you determine what capacitor size you need?
In this example simply use a larger capacitance value for longer delay, smaller capacitance value for shorter delays. It would be possible to create a formula for this based on the capacitor charging formula.
hey, how do I make a delay turning on the led?
Place a resistor (1k-10k) in between the circuit and the battery (in series).
@@Ohmify nice, I was thinking about it but I am beginner on eletric
can you please make a video and demonstrate?@@Ohmify
@@mejoTV- I'll keep it in mind for the future
what voltage of battery did you use?
9V
A question ✋🏻, can we use the LED without the resistor??
no, usually the voltage and current are so high that itll burn out
No, you should use a resistor to avoid damaging the LED.
How does this work? The capacitor is charged to the input voltage, which is connected before the resistor and bypasses the resistor entirely. Why doesn't the LED blow up?
The capacitor is connected across both the LED and the resistor - that is parallel to the voltage source. The resistor isn't bypassed.
If you look closely, when the camera angle is from almost directly above, you can see that one of the the capacitor's wires goes to the resister, which in turn goes to the LED. It is right at 0:25 in the video.
BTW... If you use the comma and period keys, YT vids go frame by frame. It is easy to remember because the comma and period are on the '' keys. Don't use the shift key, though. Unless you want to speed-up or slow-down the playback speed.
Also, the left ←and right → arrow keys jump backward/forward by 5 seconds.
@@RCFrizzit seems you are correct that when the voltage source is removed, the capacitor is in serial connection with the LED. However, the resistor is still present in the circuit and keeps the current below threshold level.
How much voltage to connect with led
You always connect a LED in series with a resistor. And as long as you do, you can apply any voltage you want. You just have to adjust the resistance value according to the voltage. More info here: build-electronic-circuits.com/current-limiting-resistor
Resister value ?
1k almost always works. If you want to calculate it, check out this article: www.build-electronic-circuits.com/current-limiting-resistor/
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how is this different from an inductor
A few differences: Inductors have very little capacity compared to capacitors. An inductor will resist change in current. Current can still flow through a charge inductor.
For what we need it?
One important thing is to add time delays into a circuit. For example to blink an LED.
what about what does a capacitor do in a flasher circuit?
It adds delay to keep the LED on/off for a short time
that is easy but how much value of capacitor we need.... and no one talks about it...
Try with 1000µF. It's possible to calculate it too, but a bit complex, so the trial and error method is usually faster for circuits like this.
Please teach me how to make a DRAM with capacitors 😭
I don't know how to do that.
@@Ohmify :')
Wish I could give two likes.
Sarvan video for me special
Can u plz provide the circuit diagram of this entire work
You beat me to it! I was going to ask this dumb question as a joke! You are not the sharpest pencil in the pencil box are you?
Came from a gmail
🫡
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Best explanation
Thank you.