RC Circuit (7 of 8) Discharging a Capacitor, Time Constant, Voltage, Current, Worked Example
ฝัง
- เผยแพร่เมื่อ 7 ก.พ. 2025
- Shows how to calculate the voltage and current with respect to time while discharging a capacitor in an RC circuit with a DC source.
When you said "Thank you very much for watching" I replied out loud "No, thank YOU". I was confused in class yesterday but all of your RC videos are a treasure.
That is very funny, thanks for letting me know. You can see a listing of all my videos at www.stepbystepscience.com
absolutely brilliant, no fuss, just solid explanations you can easily wrap your head around
Great to hear, thanks much for the comment!
My professor tried explaining RC circuits so many times in class but I was still confused till I had watched your videos. I want to thank you for your great explanation on RC circuits.
Glad I could help! Best wishes to you.
I have a test in an hour, these videos are really helpful! thank you.
Best of luck! Glad the videos are helpful.
You are a god among men. Your videos are not in vain!
I appreciate that! Very nice of you to say.
Thank you so much. You're a lifesaver.
You're welcome!
Great video and explanation as usual. Thank you!!!
These videos are so helpful, thanks!!
Glad you like them! Thanks for the nice comment.
Thanks so much professor!
i'm getting the hang of this thank you
my pleasure, thanks for watching
I like your lesson.
Like your comment, thanks!
Very helpful nd nice easiest way to learn
I am very confused sir . Why does a capacitor fully discharge after five time constants? Can you please kindly explain me?
You are wonderful
Great Video....Thanks!!
Good example
Good stuff
Glad you enjoyed
Taking my exam today. Im ready. 😊
Excellent, hope it goes well. You can see a listing of al my videos at www.stepbystepscience.com
Thank you!!!
You're welcome!
Thank you for the help!
You are very welcome.
Thank you sir,
I have one question, in last question u did, mention the capacitor fully discharged (5. 26.8s)=134s..,
Can this formula (5RC =5. 26.8) will applicable to charge fully ...?
Yes, the capacitor is considered to be fully charged after 5 time constants.
Hi sir ,
here you used two formulas v(t)=Vb(1-e^-t/RC) vs v(t)=Vb(e^-t/RC) i confused over here in previous one you used this formula v(t)=Vb(1-e^-t/RC) for calculation but here it is different , can you help me here
And also i have doubt over how to select the capacitor input value for to store high voltage
am doing voltage doubler circuit but without this knowledge i cont able to continue my self
Please help me here
How do you calculate the Capacitance and Resistance given only potential difference(voltage) over time?
what do you mean by the cap is fully discharged after 5 time constants? is this a standard rule with all caps regardless of the value of capacitance? Thanks in advance :)
Yes, that is the standard rule for all capacitors. The actual time will be different because the capacitance and the value of the resistor in series with the capacitor can be different. Time constant = R x C.
I have a problem I can not solve: I have a power supply of DC=12V, a resistance of 12Ohm and a lamp (bulb): 6V; 0.5A. What capacitor do I need to light the bulb 2 seconds? Thank you!
What can't Vin Diesel do?
jks Great vid!
Got to keep myself busy between movies!
@@stepbystepscience What a guy!!! XD
soooooooperrrrrbbbbb
Thanks for the comment.
what is the value for R if you have a bunch of resistors in your circuit? Just parallel resistors or Req?
Then you have to calculate the equivalent resistance.
please consider adding an annotation explaining that e is a predetermined number, , excellent video, thanks
e is a constant, ruler's number, 2.718, I think I said that in all of the videos, if not, my mistake. Thanks for you positive comments.
To understand e, we first need to understand "GROWTH!" Assume you have 1 dollar and you will get 100% growth a year from a bank as annual growth. Okay, then. After a year, you will have 2 dollars, right? Assume the bank pay you 2 times a year now. You will get your money after 6 months. But they will divide 100% profit into 50% each. But this is slightly better for you. After 6 months, 1x50%=1x0.5=0.5 cents, and you have 1.5 cents in total after 6 months. And after a year, you will have 1.5x50%=1.5x0.5=0.75 cents, and you have 2.25 cents. Slightly better right? (1+100%/2)^2, you have half the growth rate over 2 times period which is called semi-annual growth. What if you gonna have 4 different times in a year? You will have (1+100%/4)^4, and so you will get 2.441$ at the end of the year. That's called quartly growth. So the formula is (1+1/n)^n. I know what your thinking! Is it possible to get unlimited money? Chill, bro. Now, you put n=1, you will get 2$ for annual growth right? If n=2, you will get 1.5$. Now, assume you are getting every day. n=365, you will get 2.7146. Let's make it every minutes, every seconds, how so ever, n=1000000 (1 millions times), you get 2.7182804. Now, I hope you understand about what is e? It is the maximum possible result after continuously compounding of 100% growth over 1 time period. Thus e = 2.718.
Great video thanks. But how do you get (0.472) in place of e*-0.75 ?
e is an nuber like π. its ( rounded) 2.7
yu da man
The only thing that I don't understand is the reason for "1 dislike in the video"!
Btw, nice explanation, Sir...
I was wondering the same thing, thanks for the comment.
Sir,,,(e)-1=0.368 Not understanding please solve my problem Sir💯👀❤
that is eulers number (e which equals 2.718) raised to the power of minus 1 and that equals 0.368.
Does that help?
@@stepbystepscience not understand 2.718-1=1.718🐁