This is a really good introductory video for capacitance. The way it's traditionally taught (or at least when I was in college) is to present capacitance as almost 3 different interpretations (the effects described in this video). Since students learn DC first, it makes sense to start with the basic formula of capacitance as it relates to charge & voltage. Eventually you learn AC circuit analysis, and with that comes the frequency filtering interpretation. And once you move on to power electronics, the phase effect becomes most relevant. I fell into the trap of thinking of capacitance in terms of these "different" modes of analysis. But true understanding of the phenomena taking place within a capacitor has to be taken with all these effects in mind, because in any given circuit, one of these effects might be more pronounced or less than the others.
Congrats for the great video! Btw, could you make a video about inductors, please? Also, can I suggest you those topics: RLC circuit; harmonics; power quality. Thks
Yeah, this makes it look really easy. I do feel way more motivated to dig a bit deeper into my Electricity&Magnetism course. If I had any money I would probably by an oscilloscope to be able to get a bit better at working with it.
Nice video, though I have a question. I basically understand the concept of the frequency filtering and how this is visible by "rounding of" the sharp transitions on the square wave signal. How ever I don't get how (if at all) the filtering is "visualized" on the "Pure Sine wave" example. I.e. what is the "visible effect" in that demonstration ? Is it simply the smaller amplitude of the "graph" on the "scope" ? Best regards.
Good question! You can essentially see the effect on a pure sine wave in the form of amplitude attenuation. As a sine wave starts to be filtered out by an impedance, it will decrease in amplitude. It's not a step function from full amplitude to 100% filtered out, it decreases with respect to the impedance.
So, the question is, what values of what variables are sufficient to determine a healthy capacitor? I guess that we need, at least, capacity, ESR, and some metric of leakage. Some may not be constants, but functions of say, frequency, yes? Im confused, but I am confident that you are not! Thanks!
Dumb question, as I'm no EE: Is this why they have starting capacitors for AC motors, such as the 1/3 and 2/4 horse AC motors I have for running grinding wheels, etc, regarding the voltage/current phases relationship?
Good question! They generally use a capacitors ability to store energy (and rapidly discharge energy) to kick-start the motor into motion. AC motors work best when the system is already moving, so the capacitor helps get the motor into that state.
Daniel would so get you off an island, if marooned. 😀 Probably take him less then an hour to create a radio, with coconuts and palm leaves. Mad props! Wicked smart.
my ocd has taken all my focus and put it on the tilted test gear column in the back ground "nr 4 from the right".. what is under the equipment haha?. need to watch every video twice :-P thanks for the video's :) what about long term data logging ?
Dear Daniel... it seems that the current shifts backward... aslo my textbooks aswell as your oscilloscope tells the same... also the phase shift is not necessarily 45 degrees out of phase it depends on capacitance and the frequency of the circuit... Please rectify me if I am wrong..
Great question! The question to ask is "what crosses 0V first?" If you look at 3:05, current is the green trace (channel 2). With the capacitor added, the current rises and falls before the voltage, meaning the current is leading the voltage. Also, the phase relationship between voltage and current for a purely capacitive circuit will be -90, but for circuits with more than just capacitance (all real life circuits) the phase angle can be derived from all relevant impedances/reactances in the circuit. And, the reactance and impedance of inductors and capacitors is relative to frequency, so frequency will effect the phase as well.
Collin from MAKE Electronics RIP OFF video right here So many people try ripping off Collin from MAKE Electronics by using similar music, production etc
Quite interesting! It's way easier to understand seeing it on the screen.
Thats was very instructive. Thank you. Im glad the keysight giveaway sent me here. Awesome teacher and material.
Daniel is awesome! Thanks for this intuitive lesson.
Thanks!
Handy refresher on A/C and capacitors !!
another awesome video. thanks for keeping up with them !
This is a really good introductory video for capacitance. The way it's traditionally taught (or at least when I was in college) is to present capacitance as almost 3 different interpretations (the effects described in this video). Since students learn DC first, it makes sense to start with the basic formula of capacitance as it relates to charge & voltage. Eventually you learn AC circuit analysis, and with that comes the frequency filtering interpretation. And once you move on to power electronics, the phase effect becomes most relevant. I fell into the trap of thinking of capacitance in terms of these "different" modes of analysis. But true understanding of the phenomena taking place within a capacitor has to be taken with all these effects in mind, because in any given circuit, one of these effects might be more pronounced or less than the others.
Excellent video !! Clear - concise - extremely informative !! Love this series !!
This is such a likable guy, like a friend teaching you
That was awesome, and fast!
Lovely explanation
Congrats for the great video! Btw, could you make a video about inductors, please? Also, can I suggest you those topics: RLC circuit; harmonics; power quality. Thks
Inductors are next!
thx!
Nice video!
Finally I understood why capacitors work as filters! Thanks!
Yeah, this makes it look really easy. I do feel way more motivated to dig a bit deeper into my Electricity&Magnetism course. If I had any money I would probably by an oscilloscope to be able to get a bit better at working with it.
Mas mas mas! This is awesome!
That's LOT of info in four and a half minutes! Great video.
Thank you!
thank you
ElectroBOOM sent me! That is all. :)
(Oh great video too, btw!)
Beautiful scopes...
Thanks!
Came from electroboom. Nice vid. Look forward to learning more.
Nice video, though I have a question.
I basically understand the concept of the frequency filtering and how this is visible by "rounding of" the sharp transitions on the square wave signal.
How ever I don't get how (if at all) the filtering is "visualized" on the "Pure Sine wave" example. I.e. what is the "visible effect" in that demonstration ? Is it simply the smaller amplitude of the "graph" on the "scope" ?
Best regards.
Good question! You can essentially see the effect on a pure sine wave in the form of amplitude attenuation. As a sine wave starts to be filtered out by an impedance, it will decrease in amplitude. It's not a step function from full amplitude to 100% filtered out, it decreases with respect to the impedance.
GREAT ViDEO
This year joining electronics in college
#guy from india # new subscriber
So, the question is, what values of what variables are sufficient to determine a healthy capacitor? I guess that we need, at least, capacity, ESR, and some metric of leakage. Some may not be constants, but functions of say, frequency, yes? Im confused, but I am confident that you are not! Thanks!
do guys should make a video about cheap current probe which can go with the 1000x series DSO
Good idea! At some point I want to cover the different options people have for measuring current.
thks Daniel
im on 14 week coarse for my full ham licence in uk
i did not got it, because you´re talking about a HPF but the swwep in your oscilloscope behaves as an LPF.
This is a great and informative video...Is this also why you always should terminate transmission lines?
That's definitely part of it. Impedance matching/termination also helps minimize reflections and maximize signal transfer to the receiver.
Very informative video, keep going ;)
really informative video , nice work
Thanks!
Dumb question, as I'm no EE: Is this why they have starting capacitors for AC motors, such as the 1/3 and 2/4 horse AC motors I have for running grinding wheels, etc, regarding the voltage/current phases relationship?
Good question! They generally use a capacitors ability to store energy (and rapidly discharge energy) to kick-start the motor into motion. AC motors work best when the system is already moving, so the capacitor helps get the motor into that state.
At 1:21 I have noticed a spike at the wave corner (the pace where it starts to rise). Could you be so kind and explain me what is it?
Great question! I was able to narrow it down to some significant parasitic inductance in the jumper wires I was using.
Thank you for explanation. Maybe in next video you could show us the spike investigation process?
Also, more automotive based videos please :-) (FlexRay / CAN etc) maybe you can highlight the need for high speed probes with FlexRay?
Daniel would so get you off an island, if marooned. 😀 Probably take him less then an hour to create a radio, with coconuts and palm leaves. Mad props! Wicked smart.
nice
my ocd has taken all my focus and put it on the tilted test gear column in the back ground "nr 4 from the right".. what is under the equipment haha?. need to watch every video twice :-P thanks for the video's :) what about long term data logging ?
Dear Daniel...
it seems that the current shifts backward... aslo my textbooks aswell as your oscilloscope tells the same... also the phase shift is not necessarily 45 degrees out of phase it depends on capacitance and the frequency of the circuit...
Please rectify me if I am wrong..
Great question! The question to ask is "what crosses 0V first?" If you look at 3:05, current is the green trace (channel 2). With the capacitor added, the current rises and falls before the voltage, meaning the current is leading the voltage.
Also, the phase relationship between voltage and current for a purely capacitive circuit will be -90, but for circuits with more than just capacitance (all real life circuits) the phase angle can be derived from all relevant impedances/reactances in the circuit. And, the reactance and impedance of inductors and capacitors is relative to frequency, so frequency will effect the phase as well.
Keysight Oscilloscopes .... thanks a lot..
you highlighted one of my major misconceptions...
thanks
What effect would a capacitor have if you installed one between CAN bus high and low channels? Would it also start to smooth out the square wave?
It would start to smooth them out, but you'd likely start to see some cross talk between the two channels.
How can I contact you to ask about a project?
Neat
Ilike to test that
I need that
I subscribed to your channel to win the oscilloscope lol
2 minute guru, hi!
Hi!
I need the crate, but how ..
I wish so much that I could afford one of these
i need 2 channel scope
Check out our 1000 X-Series for some top notch 2 and 4 channel options on a budget!
ElectroBOOM sent me
Need that scope I am poor
How can I get it for free I'm poor I'm on SSI all my money goes to rent
ElectroBOOM brought me here
I want the free selescope
Low body capacitance
Give me the keysight
ок
Cap concept in a compact shell *****
the speed is too fast for a non-native english learner.
When you change the playback speed to 0.5 he sounds drunk
Came from electroboom
Hi, can I get an oscilloscope from electroboom? he brought me here
Thanks alot
Collin from MAKE Electronics RIP OFF video right here
So many people try ripping off Collin from MAKE Electronics by using similar music, production etc
I haven't seen that one, I'll have to look for it! He did some great videos when he was over there.
Came from electroboom