Capacitor AC Response

Impedance
Calculate
Examine
Inductor
Resistor
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.

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Capacitance concepts

Inductance concepts
 
HyperPhysics***** Electricity and Magnetism R Nave
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Capacitive Reactance

The frequency dependent impedance of a capacitor is called capacitive reactance.

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

For = x10^ F = = pF
at angular frequency ω = x10^ rad/s
and frequency = x10^ Hz = kHz = MHz

the capacitive reactance is

XC = x10^ ohms = kohms = Megohms
AC behavior of capacitor
 Index

Capacitance concepts

Inductance concepts
 
HyperPhysics***** Electricity and Magnetism R Nave
 Go Back