✔ Why Dc Blocking Capacitor

Why Dc Blocking Capacitor

- July 05, 2018

The blocking property of the capacitor is inversely proportional to the frequency that means if supply frequency increases the capacitive reactance decreased so the capacitor will pass more current. Why does a capacitor block dc.

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In this post we will discuss this kind of behavior of capacitorfirst we will consider dc supply connected to a parallel plate capacitor as shown in figure below.

Why dc blocking capacitor. Why do capacitor block dc but allows ac. And similarly if there is a path taken from the ac source through the dc blocking cap and back to the ac source again then current will flow. A dc blocking capacitor just represents a short for ac only.

Keep in mind that a capacitor act as a short circuit at initial stage and a fully charged capacitor behave as an open circuit. Capacitors resist a changes in voltage while inductors resist a change in current and acts as a short circuit in dc. All of us know that a capacitor do not allow dc current to pass through it but allows ac current.

The reason why capacitors block dc is because they are simply two separated plates that chargea gap between them prevents current from passing from one plate to the other. You can think of them as electric sponges. A capacitor blocks dc as once it gets charged up to the input voltage with the same polarity then no further transfer of electrons can happen accept to replenish the slow discharge due to leakage.

Applications of capacitors include smoothing out a rectified voltage or blocking dc and passing ac.

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