What phenomenon does capacitive reactance refer to?

What phenomenon does capacitive reactance refer to?

• A. The opposition to direct current flow in a capacitor
• B. The opposition to alternating current flow in a capacitor
• C. The increase in capacitance with frequency
• D. The decrease in current with resistance

Answer: (B)

Capacitive reactance specifically refers to the opposition that a capacitor presents to alternating current (AC) flow. Unlike direct current (DC), where capacitors can act as short circuits once fully charged, in AC circuits, capacitors continuously charge and discharge as the current alternates. This creates a phase difference between the voltage and current. The capacitive reactance is frequency-dependent, meaning it varies with the frequency of the AC signal; it decreases as frequency increases. This behavior is essential in AC circuit analysis and plays a critical role in the design and function of many electronic filters and oscillators. Understanding this concept is crucial for grasping how capacitors influence AC circuits compared to their behavior with DC.

Capacitive reactance specifically refers to the opposition that a capacitor presents to alternating current (AC) flow. Unlike direct current (DC), where capacitors can act as short circuits once fully charged, in AC circuits, capacitors continuously charge and discharge as the current alternates. This creates a phase difference between the voltage and current. The capacitive reactance is frequency-dependent, meaning it varies with the frequency of the AC signal; it decreases as frequency increases. This behavior is essential in AC circuit analysis and plays a critical role in the design and function of many electronic filters and oscillators. Understanding this concept is crucial for grasping how capacitors influence AC circuits compared to their behavior with DC.