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The average power dissipated in a pure capacitor in one complete cycle of AC is (V is the rms value of the AC voltage)

The average power dissipated in a pure capacitor in one complete cycle of AC is (V is the rms value of the AC voltage) Correct Answer zero

Concept:

  • Capacitor: A capacitor is a two-terminal energy storage device that stores energy in the form of a static electric field during the positive half cycle and gives away during the negative half cycle of supply.
    • Its unit is Farad, unit F. Farad is a large unit so generally, we using μF.

 

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  • Alternating current: The electric current whose direction changes periodically is called electric current.

 

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  • Alternating current reverses its direction periodically.
  • It also changes its magnitude periodically because of the induced electromagnetic force.
  • For Alternating current both magnitude and direction change. The frequency of the alternating current in the Indian power supply is 50 Hz. The time period is 1/50 = 20 msec.


Explanation:

The capacitor is connected with alternating current (AC),

  • During the positive half cycle, the capacitor will be charged.
  • During the negative half cycle, the capacitor will be discharged.


So, net power dissipation in the pure capacitor in one complete cycle will be zero.

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