Capacitor AC Response

Impedance

Contribution to complex impedance Phasor diagram

You know that the voltage across a capacitor lags the current because the current must flow to build up the charge, and the voltage is proportional to that charge which is built up on the capacitor plates.

Capacitive Reactance

This calculation works by clicking on the desired quantity in the expression below. Enter the necessary data and then click on the quantity you wish to calculate. Default values will be entered for unspecified quantities, but all quantities may be changed.

Impedance = 1 / ( angular frequency) x (capacitance)