AC Voltage Applied to a Capacitor
AC Voltage Applied to a Capacitor: Overview
This topic covers concepts such as Pure Capacitance AC Circuit, Capacitive Reactance, Variation of Capacitive Reactance with AC Frequency, Phasor Diagram for Pure Capacitive Circuit, Phase Difference in Voltage and Current in Pure Capacitance, etc.
Important Questions on AC Voltage Applied to a Capacitor
The time constant of the circuit consisting capacitor and resistance is .

As the frequency of an AC circuit increases, the current first increases and then decreases. What combination of circuit elements is most likely to comprise the circuit?

What is instantaneous power in purely capacitive circuit.

Instantaneous power is defined as the limiting value of the average power when time tends to_____.

No power loss associated with pure capacitor in ac circuit.

Why power in a circuit is zero in which current and voltage are out of phase?

When the supply frequency increases, what happens to the capacitive reactance in the circuit?

A capacitor has capacitance and reactance . If capacitance and frequency becomes doubled, then reactance will be

Which of the following curves correctly represents the variation of capacitive reactance with frequency ?

Explain the term: Capacitive reactance.

Role of capacitor in a circuit-

A capacitor is connected to a ac supply. The rms value of current in the circuit is

A capacitor is connected to a ac supply. The rms value of current in the circuit is

In an alternating current circuit consisting of element in series, the current increases on increasing the frequency of supply. Which of the following elements are likely to constitute the circuit?

A capacitor is connected to a ac source. The capacitive reactance is

Which of the following graphs represents the correct variation of capacitive reactance with frequency ?

In a pure capacitive circuit if the frequency of ac source is doubled, then its capacitive reactance will be

An alternating voltage is connected to a capacitor of capacity through an A.C. ammeter of zero resistance. The reading of ammeter is

A capacitor is connected across a D.C. source, the reactance of the capacitor will be ______.

A capacitor is connected to a power source (V in volt, t in second). The value of rms current (in ampere)
