AC Voltage Applied to a Capacitor

IMPORTANT

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

EASY
IMPORTANT

The time constant of the circuit consisting capacitor C and resistance R is RC.

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IMPORTANT

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?

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IMPORTANT

What is instantaneous power in purely capacitive circuit.

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

MEDIUM
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No power loss associated with pure capacitor in ac circuit.

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Why power in a circuit is zero in which current and voltage are 90° out of phase?

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

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

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

EASY
IMPORTANT

Explain the term: Capacitive reactance.

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Role of capacitor in a circuit-

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A 60 μF  capacitor is connected to a 110 V rms, 60 Hz  ac supply. The rms value of current in the circuit is

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IMPORTANT

A 30 μF  capacitor is connected to a 150 V, 60 Hz  ac supply. The rms value of current in the circuit is

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IMPORTANT

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?

EASY
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A 5 μF capacitor is connected to a 200 V, 100 Hz  ac source. The capacitive reactance is

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

EASY
IMPORTANT

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

MEDIUM
IMPORTANT

An alternating voltage V=V0 sin ωt is connected to a capacitor of capacity C through an A.C. ammeter of zero resistance. The reading of ammeter is

EASY
IMPORTANT

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

HARD
IMPORTANT

A capacitor 50μF is connected to a power source V=220sin50t (V in volt, t in second). The value of rms current (in ampere)