Transient analysis and behaviour of inductor and capacitor

Thread Starter

skkk

Joined Apr 5, 2010
3
Any body explain me how inductor and capacitor behave in transient analysis when t=0,t>0. And why? Means how capacitor and inductor open circuit and short short circuit and when?
 
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bk8190

Joined May 12, 2010
4
Capacitors are open circuits to DC, and short circuits to high frequencies.
Inductors are open circuits to high frequencies, and short circuits to DC.

The voltage across a capacitor cannot change instantly, and the current through an inductor cannot change instantly.

A capacitor is governed by the differential equation
I = C (dV/dt)

An inductor is governed by the differential equation
V = L (dI/dt)
 

Ghar

Joined Mar 8, 2010
655
In this case DC means "after a long time".
Suddenly connecting a DC source (like a battery) is not true mathematical DC. After a "long time" it's DC, when it's entirely constant. That's when the capacitors are fully charged (open circuit, no more current) and the inductors carry the maximum current they can (short circuit, no more voltage).
 
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