true or false? capacitors don't change ac to dc?

4 Answers

Relevance
  • 1 decade ago
    Best answer

    A capacitor stores electrical energy that can be discharged and used for some purpose when needed. Such as start-up with an electric motor, gives it a boost. Diodes, inverters, and rectifiers all change from one to the other. Diode for small electronic applications, inverter and rectifiers for larger uses like running your little TV from your car. ( inverter DC to AC )

  • Matty
    Lv 4
    1 decade ago

    Capacitors act like a frequency dependent resistor to an AC signal, its impedance is inversely proportional to the frequency of the signal, so for high frequency AC signals, it offers no impedance(it's basically a short circuit), for lower frequency signals it offers more and more impedance until you get to a DC signal which it just stops, it's an open circuit to DC

    You use a capacitor when producing a steady DC signal by using it in conjunction with a wave rectifier, often made from diodes. In this role they serve to "smooth" the resultant wave coming out of the rectifier(which is basically the absolute value of a normal wave)

    So no caps by themselves do not change AC to DC, but they're part of the larger process

  • Anonymous
    1 decade ago

    a capacitor inserted in an ac circuit has an alternating potential difference and so it does not change ac in cc

  • LeAnne
    Lv 7
    1 decade ago

    True.

Still have questions? Get answers by asking now.