Question about charging multiple capacitors?
Capacitor connected to a 5V DC source. Charge will eventually reach Q.
Now I don’t understand the following situation:
I thought the negative charge on one pole of the power supply would collect on one plate and push electrons out of the opposite plate. These electrons flow back into the power supply. This is how the capacitor would charge normally.
But apparently my view is not correct, because when deriving the formula
W = 1/2 C U²
I just saw that charges are supposed to fly from one plate to the other. So, what happens in reality when a capacitor charges? Why does the corresponding positive charge form on the other plate?
(No Ratings Yet)
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The voltage source ‘draws’ on one side of the C the charges from the plate and ‘press’ simultaneously charges to the other plate.
Although it is not always 100% correct for water comparison, the voltage source could be called a pump which is below two equally high, equal-sized basins and connects both via one hose each. When the pump is switched on, a basin is emptied, the other is filled further. If the pump is switched off again, the water level is again adjusted.
If there were loads in a big style flying between the plates through the area, that would be quite bad, because then capacitors could not hold a charge. But this takes place in a small style and is called self-discharge. However, the largest part of the self-discharge in the real circuit takes place via the connected network.
But can I ask what the starting point for your lead is?
https://www.youtube.com/watch?v=hKcwpmdarkY&list=PLdTL21qNWp2aoNitYUEe5ArJ_fjJQ3bwr&index=12
Here I saw the lead. As you describe, I thought that myself. Because with this thought model one can explain why a plurality of capacitors connected in series are charged at all and why the same charge has to be seated on each capacitor (except parallel circuit, here division!)
Ah, yes I see the lead has been described somewhat unhappy or an important connection for understanding has been neglected. So what was shown in the video is mathematically already ok, but didactically bad.
I picked you a video of a channel I really appreciate:
14 Energy of a Condenser Calculate Formula – YouTube
At 1:10 you should notice a well-known connection with work and performance. This is always important in such considerations.
I just looked in again, because good question showed a notificatioin to the post here, and I just notice that I have a type:
‘This is not a good condenser he describes, but a real one.’
In this sentence, instead of ‘realer’ stand ‘ideal’.
Yeah, that’s all right. With a critical point:
He always says “a good capacitor will have infinite ohms between the plates”. This is not a good condenser he describes, but a real one. Yes I know this is only term schupserei, but keep extremely important, because a real capacitor will have leakage currents during operation, even very small. That is why there is no infinitely high resistance that could be squeezed between. Even air has a finite electrical resistance.
But it doesn’t matter for the basic consideration. This will only be important in specific applications. Nevertheless, it should be mentioned to prevent later surprises.
Hello,
Thank you, I’ll look at it. I also found another video that describes it very great: https://www.youtube.com/watch?v=Ag2RujOHqJ8
No charges fly between the plates and this is also not necessary for the delivery of the capacity.
Moin,
the water comparison might help. The pressure is applied on one side of the condenser. The charges of one side draw the charges of the other side.
With alternating voltage, this is still a tensioner. At alternating voltage, the current shifts. and Current and voltage are no longer “in phase” …
Greetings