Capacitors block DC voltage. Why they are used in DC circuits?

I think it would help to understand how a capacitor blocks DC (direct current) while allowing AC (alternating current). Let's start with the simplest source of DC, a battery: just a battery. read more

Here's a good way to think of it: a capacitor blocks DC but also stores charge. As a result, the DC voltage across a capacitor can't change immediately. read more

Applications of capacitors include smoothing out a rectified voltage, or blocking DC and passing AC. The reason why capacitors block DC is because they are simply two separated plates that charge(a gap between them prevents current from passing from one plate to the other). read more