Capacitive Reactance Formula |
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\( X_c \;=\; \dfrac{ 1 }{ 2 \cdot \pi \cdot f \cdot C }\) (Capacitive Reactance) \( f \;=\; \dfrac{ 1 }{ 2 \cdot \pi \cdot X_c \cdot C }\) \( C \;=\; \dfrac{ 1 }{ 2 \cdot \pi \cdot f \cdot X_c }\) |
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| Symbol | English | Metric |
| \( X_c \) = Capacitive Reactance | \(\Omega\) | \(\Omega\) |
| \( \pi \) = Pi | \(3.141 592 653 ...\) | \(3.141 592 653 ...\) |
| \( f \) = Frequency | \(Hz\) | \(Hz\) |
| \( C \) = Capacitance | - | \(F\) |
Capacitive reactance, abbreviated as \(X_c\), is the opposition to holding an electric charge. It is used in electrical engineering and physics, particularly in the study of alternating current circuits. It refers to the opposition or resistance that a capacitor presents to the flow of alternating current, just like resistance opposes the flow of direct current.
When an AC voltage is applied to a capacitor, the capacitor charges and discharges in response to changes in the voltage. This charging and discharging behavior creates an opposition to the flow of current, which is known as capacitive reactance. As the frequency of the AC signal increases, the capacitive reactance decreases, and vice versa. This means that capacitors allow more current to flow at higher frequencies and less current at lower frequencies. This property is utilized in various electrical and electronic circuits for purposes such as filtering, coupling, and energy storage.
