15
votes
Why does a capacitor act as an open circuit under a DC circuit?
You can see from the other answers why it appears that way mathematically.
Physically, it's because it is an open circuit!
Consider the most basic form of a capacitor, the parallel plate capacitor. ...
4
votes
Why does a capacitor act as an open circuit under a DC circuit?
In any realisable circuit, there is resistance in the paths connecting a capacitor to a voltage source, a resistance represented by R1 here:
simulate this circuit – Schematic created using ...
- 42.2k
4
votes
Why does a capacitor act as an open circuit under a DC circuit?
Here is a picture of a capacitor:
The capacitor is the pair of discs in the middle of the apparatus. As you can see the disks are not connected to each other at all. A capacitor is basically an open ...
- 1,720
3
votes
Is it possible to power an AC-to-DC switching adapter with a DC input?
This will work fine until you have a short on the AC side upon which the poor AC rated fuse will see a DC arc. If you’re lucky, it will manage to break the current and everything is fine. If not, the ...
- 16k
2
votes
Why does a capacitor act as an open circuit under a DC circuit?
The physics/nature of a capacitor are such that the current through them is proportionate to the rate of change of the voltage applied across their terminals. Since the rate of change is ...
- 22.9k
2
votes
Why does a capacitor act as an open circuit under a DC circuit?
Current into or out of a capacitor is proportional to the rate of change of the voltage across its terminals. Vcc and ground are normally unchanging; decoupling capacitors are added to help them ...
- 21.3k
2
votes
Accepted
What is the best way to convert positive voltage to negative while consuming the smallest amount of power?
Where each rail takes either a similar current, or a low current, it's often better to split the battery voltage to provide a virtual ground somewhere between the rails.
This is not the case if the ...
- 171k
1
vote
Why we don't use twisted cable in dc power?
BLUF: AC signals on wires are a two-way street (all applicable puns aside for this trite euphemism) - Twisting wires make results in less AC current passing than straight wires. Conversely, they also ...
- 11
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