What is the unit of measurement for capacitive reactance?

• A. Farads
• B. Henrys
• C. Ohms
• D. Volts

Answer: (C)

Capacitive reactance is a measure of a capacitor's opposition to alternating current (AC). The unit of capacitive reactance is ohms, which is the same unit used for resistance in electrical circuits. Capacitive reactance (Xc) is calculated using the formula Xc = 1/(2πfC), where f is the frequency of the AC signal and C is the capacitance in farads. This equation shows that capacitive reactance depends on the frequency of the current and the amount of capacitance, both of which contribute to how a capacitor behaves in an AC circuit.

The other units mentioned relate to different electrical properties: farads are the unit of capacitance, henrys measure inductance, and volts are the unit of electrical potential. These terms represent distinct concepts in electrical and electronics engineering and are used in different contexts. Understanding that capacitive reactance is expressed in ohms highlights its role in analyzing AC circuits alongside resistance and inductive reactance.