capacitor store dc or ac?

capacitor storage

11 Answers

  • 1 decade ago
    Favourite answer

    it stores charge.

    discharges direct current that decay exponentially.

  • 4 years ago

    Capacitor Stores

  • 1 decade ago

    Dear Sir:

    Capacitors only store DC current.

    Some capacitors are "rated" for use on AC supply voltages, but this rating has to do with the makeup of the dielectric (which insulates the two plates) used in the construction of the capacitor. The dielectric used for AC rated capacitors must be capable of rapid polarity changes over, and over again. The material used in DC rated capacitors does not have to do that. In any event, when a capacitor has been charged, it has a mass of positive electrons on one plate, and a large absence of electrons on the other plate, with the two plates separated by an insulating dielectric material. So, when you connect the capacitor to something, the electrons will seek to reach a state of equilibrium in a steady flow of current in one direction (which is direct current).

    Some capacitors are large enough to produce dangerous shocks to humans if the terminals are accidently touched when the capacitor is fully charged. This situation may occur in capacitors rated for voltages higher than about 75 Volts DC. Very large capacitors rated at lower voltages than 75 Volts DC could also cause injury from burning skin or fingers

    if the terminals are shorted and an arc is produced. So always use caution when dealing with high capacitance capacitors, especially when the combination of high voltage rating and high capacitance are involved.

  • 1 decade ago

    A capacitor is electrically like a spring is physically. Push on it , let go, and it will push back.

    Does a spring push agains a static force or an oscillating force? Both.

    If you apply a static voltage to the capacitor, it can hold the charge and deleiver the electrons back to you later.

    If you apply an oscillating voltage to a capacitor, it will affect the current in the circuit since it will be sometimes be storing up electrons and other times giving back electrons that otherwise would have flowed on through the system. Thus the existence of capactiance in a circuit changes it natural frequence, much like the stiffness of the springs on you car change the natural frequency of the syspension and determines how "hard" you feel a bump in the road.

  • What do you think of the answers? You can sign in to give your opinion on the answer.
  • Kes
    Lv 7
    1 decade ago

    DC will charge a capacitor to a static level (depending on the value of the capacitance and the DC voltage). AC will alternately charge a capacitor reversing its polarity each AC cycle. The charge may depend on the frequency and voltage of the AC source and other components in the circuit. For example when a capacitor is placed in parallel with a reactor (coil of wire) they form a 'tank' circuit that can be tuned to oscillate at a desired frequency.

  • 1 decade ago

    When AC is placed across a capacitor, there is charge that is stored in a transient (e.g., time varying) way. Phasor analysis shows a sinusoidal Q(t) that is offset by a phase angle from E(t), where Q is charge and E is voltage. DC volts will hold a DC charge (one that does not vary over time).

  • Both,why?because capacitor store charges..

  • 1 decade ago

    A capacitor acts like a battery when charged.

    Like a battery it stores d/c voltage.

  • 1 decade ago

    actually, a capacitor stores electrostatic energy.

  • 1 decade ago

    i don know

Still have questions? Get answers by asking now.