AC Capacitor Reactance Quiz

What is the primary function of capacitive reactance in an AC circuit?

• To store energy in the form of a magnetic field

• To oppose changes in current

• To oppose changes in voltage

• To convert AC to DC

In a pure capacitive circuit, how does the current relate to the voltage?

• Current and voltage are out of phase by 180 degrees

• Current leads voltage by 90 degrees

• Current lags voltage by 90 degrees

• Current and voltage are in phase

What does a phasor diagram illustrate in a capacitive circuit?

• The magnitude of voltage and current

• The resistance of the circuit

• The phase relationship between voltage and current

• The frequency of the AC source

During which part of the cycle is the current through a capacitor zero?

• When the rate of change of voltage is zero

• When the voltage is zero

• When the rate of change of voltage is maximum

• When the voltage is at its peak

How is the current through a capacitor mathematically related to the voltage?

• It is the square of the voltage

• It is the inverse of the voltage

• It is the derivative of the voltage

• It is the integral of the voltage

What happens to the capacitive reactance as the frequency increases?

• It increases

• It decreases

• It becomes zero

• It remains constant

What is the unit of capacitive reactance?

• Hertz

• Ohms

• Farads

• Volts

How does a capacitor behave at very high frequencies?

• As an open circuit

• As a short circuit

• As a resistor

• As an inductor

What is the relationship between capacitive reactance and frequency?

• Exponentially proportional

• Unrelated

• Inversely proportional

• Directly proportional

What happens to the capacitive reactance when the frequency decreases?

• It decreases

• It increases

• It becomes infinite

• It remains constant