Linked Questions

27
votes
8answers
39k views

Why does a capacitor block DC and not AC? [duplicate]

If someone can explain why a capacitor blocks DC, but not AC, with some math, I will understand all of that much better. I know that there are picture animations illustrating this, but I really want ...
9
votes
1answer
25k views

How Exactly Current Flow Through a Capacitor? [duplicate]

Capacitors behaving as an open circuits, How can we understand the concept of the Electrons flowing through a capacitors.
1
vote
1answer
24k views

conduction current vs displacement current across capacitor [duplicate]

Kindly help me understand the difference between conduction current and displacement current. Quick searches explain that displacement current is associated with changing electric field, frankly ...
2
votes
2answers
5k views

How does capacitor block DC when an AC signal is superimposed on top of it? [duplicate]

This question has been in my head for so many days. When I was studying BJT amplifiers, capacitors were used for blocking DC. It is called a coupling capacitor. When the AC signal is superimposed on ...
-2
votes
3answers
2k views

Is current able to flow through a Capacitor at DC? [duplicate]

Can someone clarify whether or not a capacitor blocks current at DC? simulate this circuit – Schematic created using CircuitLab
1
vote
0answers
253 views

Current through Capacitor, how is it possible? How does it relate to displacement current? [duplicate]

What my professor is telling us that there is no conduction current through a parallel plate capacitor but the current that is passing through capacitor is the displacement current and this phenomena ...
16
votes
4answers
45k views

What is the purpose of a capacitor to ground?

I have here a filtering circuit from a microwave. What is the point of the capacitors to ground. Another answer in a previous question of mine said they were used for filtering however I don't ...
5
votes
1answer
5k views

Why place inline capacitors on PCIe traces?

What does a series capacitor on a PCIe signal trace do, and how does it work? I've read that a series capacitor smooths out ripple in a power line, but this is a signal trace, and I'd like to know ...
0
votes
2answers
6k views

High pass filter (HPF) removing the DC component of the voltage

The HPF attenuates frequencies which are below the cutoff frequency. But, in many cases a HPF is used to remove the DC level from any voltage. For example, in this case, the IC AD5933 supplies an ...
0
votes
2answers
5k views

Capacitance and Voltage of Capacitors

I have looked all over the interwebs for a few good hours now, and I cannot find anything that simply explains a capacitor! I know that the capacitance of a capacitor is measured in uF, but what is ...
2
votes
2answers
1k views

Why can't a feedback network use a capacitor? [duplicate]

Possible Duplicate: Basic Frequency Control Circuit In the following schematic, why can't R4 be taken away and the feedback network pass output feedback through C2 and R2?
2
votes
4answers
122 views

How do capacitors in series work?

If capacitors are connected in series with a vltg source, then how would each plates get the polarity? For a single capacitor, the electrons from one plate are pumped by the source towards the other ...
1
vote
2answers
159 views

Will electrons be taken from a metal plate if a positive charge is applied to it?

If I have a single metal plate, a battery, and one wire. If I connect the wire to the positive on the battery to the metal plate, does that remove electrons from the metal plate? I am attempting to ...
0
votes
2answers
91 views

Current flow from a charged capacitor [closed]

How does the electric field inside a charged capacitor force the electrons in a conductor to flow and establish electricity?