Capacitive Reactance (X_C = 1/2πfC)
Enter your known values, leave one input blank, and solves for the missing one. Try different units for next level excitement!
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A capacitor passes AC by charging and discharging, and the faster the alternation, the less time charge has to pile up and oppose it — so reactance falls as 1/f. A 1 μF capacitor looks like 2.65 kΩ at 60 Hz but only 0.16 Ω at 1 MHz. This is the mirror image of the inductor's behavior, and the complement in loudspeaker crossovers: a series capacitor feeds the tweeter, blocking bass while passing treble. At DC (f = 0) the reactance is infinite — a capacitor is an open circuit once charged.
Capacitive Reactance (X_C = 1/2πfC)
Where
- = Capacitive reactance
- = Frequency
- = Capacitance
Missing one of these? Work it out first, then come back
- Capacitive reactance — Series RLC Impedance, Inductive Reactance (X_L = 2πfL)
- Frequency — Inductive Reactance (X_L = 2πfL), Wave Speed (v = fλ)
- Capacitance — RC Time Constant, Capacitance (C = Q/V)