# Tag Info

### 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. ...

### 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

### 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

### 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

### 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

### 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
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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